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## Bioengineering Fluid Mechanics

W.a.t.e.r. – a structured approach for training on advanced measurement and experimental research.

Abstract. W.A.T.E.R. stands for Workshop on Advanced measurement Techniques and Experimental Research. It is an initiative started in 2016, in the scope of the Experimental Methods and Instrumentation (EMI) committee of the International Association for Hydroenvironment Research (IAHR) aimed to advance the use of experimental techniques in hydraulics and fluid mechanics research. It provides a structured approach for the learning and training platform to postgraduate students, young researchers, and professionals with an experimental background in fluid mechanics. It offers an opportunity to learn about state-of-the-art instrumentation and measurement techniques and the latest developments in the field by partnering with manufacturers. The W.A.T.E.R. brings together academics, instrumentation manufacturers, and public sectors in a structured setting to share knowledge and to learn from good practices. It is about training people that already have certain knowledge and skill level but need to go deeper and/or wider in the field of measurement and experimental research.

## Fluid Mechanics

Morphological aspect in translating thermodynamic terminology.

Several studies on translation have been carried out, namely on the problem of untranslation, translation of terms from various fields, and the formation of target language terms with spelling adjustments. One of them is the field of thermodynamics which is part of the field of Mechanical Engineering, which has many terms borrowed from Dutch and English. Therefore, the researchers are interested in investigating the morphological aspects of the translation of thermodynamic terms using the natural borrowing technique. This study used qualitative research methods. Researchers took terminology data from two books, namely The Fundamental of Engineering Thermodynamics and Fluid Mechanics. The results showed that the forms of borrowing that occurred were (1) borrowing by adjusting spelling and pronunciation adjustments; (2) borrowing with spelling adjustment without pronunciation adjustment; (3) borrowing without spelling adjustment, but with pronunciation adjustment; (4) adjustments to the spelling of prefixes and bound forms found 15 forms of adjustment; (5) suffix spelling adjustments found 20 forms of adjustment; and (6) a combination of translation and borrowing. In short, morphological aspects in translating thermodynamics terms are very important because they relate to the technique used.

## Applying machine learning to study fluid mechanics

Abstract This paper provides a short overview of how to use machine learning to build data-driven models in fluid mechanics. The process of machine learning is broken down into five stages: (1) formulating a problem to model, (2) collecting and curating training data to inform the model, (3) choosing an architecture with which to represent the model, (4) designing a loss function to assess the performance of the model, and (5) selecting and implementing an optimization algorithm to train the model. At each stage, we discuss how prior physical knowledge may be embedding into the process, with specific examples from the field of fluid mechanics. Graphic abstract

## Fundamentals of fluid mechanics

Editorial for special issue on “oldroyd at 100: celebrating the impact of j. g. oldroyd on non-newtonian fluid mechanics, the fluid mechanics of liquid democracy.

Liquid democracy is the principle of making collective decisions by letting agents transitively delegate their votes. Despite its significant appeal, it has become apparent that a weakness of liquid democracy is that a small subset of agents may gain massive influence. To address this, we propose to change the current practice by allowing agents to specify multiple delegation options instead of just one. Much like in nature, where—fluid mechanics teaches us—liquid maintains an equal level in connected vessels, we seek to control the flow of votes in a way that balances influence as much as possible. Specifically, we analyze the problem of choosing delegations to approximately minimize the maximum number of votes entrusted to any agent by drawing connections to the literature on confluent flow. We also introduce a random graph model for liquid democracy and use it to demonstrate the benefits of our approach both theoretically and empirically.

## Ocular Fluid Mechanics and Drug Delivery: A Review of Mathematical and Computational Models

The progress of fluid mechanics application in architecture design, export citation format, share document.

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## Fluid Dynamics Research

The Japan Society of Fluid Mechanics (JSFM) originated from a voluntary party of researchers working on fluid mechanics in 1968. The objectives of the society were to discuss about scientific and engineering problems relevant to fluid motion among researchers working in Physics, Engineering and the interdisciplinary fields and to assist in their research activities.

"Fluid Dynamics Research" whose first volume was published in 1986 is the official journal of the JSFM. "Fluid Dynamics Research" is a well-established international journal of Fluid Mechanics, published six times per year by IOPP (Institute of Physics Publishing) on behalf of the JSFM since 2009.

Published by IOP Publishing on behalf of the Japan Society of Fluid Mechanics , Fluid Dynamics Research covers original and creative works in all fields of fluid dynamics.

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Chan W Yu and Huan J Keh 2024 Fluid Dyn. Res. 56 015503

The start-up creeping motion of a porous spherical particle, which models a permeable polymer coil or floc of nanoparticles, in an incompressible Newtonian fluid generated by the sudden application of a body force is investigated for the first time. The transient Stokes and Brinkman equations governing the fluid velocities outside and inside the porous sphere, respectively, are solved by using the Laplace transform. An analytical formula for the transient velocity of the particle as a function of relevant parameters is obtained. As expected, the particle velocity increases over time, and a particle with greater mass density lags behind a corresponding less dense particle in the growth of the particle velocity. In general, the transient velocity is an increasing function of the porosity of the particle. On the other hand, a porous particle with a higher fluid permeability will have a greater transient velocity than the same particle with a lower permeability, but may trail behind the less permeable particle in the percentage growth of the velocity. The acceleration of the porous particle is a monotonic decreasing function of the elapsed time and a monotonic increasing function of its fluid permeability. In particular, the transient behavior of creeping motions of porous particles may be much more important than that of impermeable particles.

Yuta Hasegawa et al 2023 Fluid Dyn. Res. 55 065501

E Montes Gomez and D Sumner 2022 Fluid Dyn. Res. 54 065504

The mean wake of a three-dimensional surface-mounted rectangular flat plate was studied experimentally in a low-speed wind tunnel for four different aspect (height-to-width) ratios, AR = 3, 2, 1, and 0.5. The Reynolds number based on the plate width was Re = 3.8 × 10 4 and the boundary layer thickness on the ground plane, relative to the plate width, was δ / W = 1.1. The incidence angle of the plate was varied from α = 0° (where the plate is normal to the flow) to α = 90° (where the plate is parallel to the flow). The mean velocity and vorticity fields in the wake were measured using a seven-hole pressure probe. At α = 0°, the length of the recirculation zone behind the plate becomes progressively shorter as the aspect ratio is lowered and follows the same tendency as that of a finite square prism. The wakes of the slenderer flat plates of AR = 3 and 2 are characterised by two pairs of streamwise vortices: a pair of tip vortices in the upper wake and a pair of ground-plane vortices on the lower edges of the wake. With increasing incidence angle, a single tip vortex comes to dominate the wake, secondary vorticity is induced at various locations, a 'traffic light' vortex pattern may form, and ultimately a familiar wing-tip (trailing) vortex develops. In contrast, flow downstream of the less slender flat plates of AR = 1 and 0.5 is characterised by a single pair of large streamwise vortices, which become asymmetric with increasing incidence. Close to the flat plate of AR = 0.5, and at small incidence angles only, a unique pair of small inner vorticity concentrations, of opposite sense of rotation to the main streamwise vortices, is found in the upper part of the wake.

Tongbiao Guo et al 2022 Fluid Dyn. Res. 54 045501

In this paper, an exact expression for the drag coefficient of a streamwise-periodic steady incompressible laminar channel and pipe flow with micro- or macro-scale wall roughness is derived, whereby the drag coefficient is decomposed into contributions from different components of the velocity gradient tensor in the flow field. It is shown through our theoretical analysis that drag reduction cannot be achieved by adding micro- or macro-scale spanwise-periodic/-symmetry wall roughness structures to the smooth inner walls of streamwise-periodic steady incompressible laminar channel/pipe flows while maintaining the same volumetric flow rate. It is also shown that wall roughness produces a higher drag due to two factors: (a) wall roughness induces other non-zero velocity gradient terms apart from the wall-normal/radial gradient of streamwise velocity that exists in a smooth channel/pipe flow; (b) the profile of streamwise velocity in the wall-normal/radial direction deviates from the parabolic profile that produces the minimum kinetic energy loss for a given volumetric flow rate. Finally, numerical simulations of laminar channel flow with longitudinal and transverse bars are conducted, and the numerical results confirm the theoretical finding.

L Ridgway Scott 2023 Fluid Dyn. Res. 55 015501

We consider the general problem of matching rheological models to experiments. We introduce the concept of identifiability of models from a given set of experiments. To illustrate this in detail, we study two rheology models, the grade-two and Oldroyd 3-parameter models, and consider two hypothetical rheometers to see if the coefficients of the rheology models are identifiable from experimental measurements or not. For the Oldroyd models, we show that the coefficients can be estimated from experiments from the two rheometers. But for the grade-two model, it is not possible to distinguish the two nonNewtonian parameters, only their sum can be estimated, and thus the grade-two model is not identifiable by the two hypothetical rheometers. However, our results imply that a different rheometer may be able to do that.

W A McMullan and J Mifsud 2023 Fluid Dyn. Res. 55 055507

This paper assesses the effect of thermal stratification on the prediction of inert tracer gas dispersion within a cavity of height ( H ) 1.0 m, and unity aspect ratio, using large eddy simulation. The Reynolds number of the cavity flow, was 67 000. Thermal stratification was achieved through the heating or cooling of one or more of the walls within the cavity. When compared to an isothermal (neutral) case, unstable stratification from surface heating generally has a weak influence on the primary recirculating cavity vortex, except in the case where the windward wall is heated. For windward wall heating, a large secondary vortex appears at the corner of the windward wall and cavity floor. Unstable stratification has no significant influence on the removal of pollutant mass from the cavity. Stable stratification through surface cooling drastically alters the flow pattern within the cavity, pushing the cavity vortex towards the upper quadrant of the cavity. As a result, large regions of stagnant fluid are present within the cavity, reducing the effectiveness of the shear layer at removing pollutant concentration from the cavity. Some stable stratification configurations can increase the pollutant mass within the cavity by over a factor of five, when compared to the neutral case. Pollutant concentration flux maps show that, in stably stratified cases, the majority of pollutant transport from the cavity is the result of entrainment into the primary cavity vortex. The results show that pollutant concentrations in urban street canyon-type flows are substantially altered by diurnal heating and cooling, which may influence pedestrian management strategies in urban environments.

Sherwin A Maslowe 2022 Fluid Dyn. Res. 54 015513

L L Ferrás and A M Afonso 2023 Fluid Dyn. Res. 55 035501

This work presents a comparison between the PTT-X (extended Phan-Thien and Tanner (PTT)) and the generalised PTT (gPTT) viscoelastic models. The PTT-X model was derived based on a combination of reptation and network theories, allowing in this way a microstructural justification for the kernel function. The gPTT model is based on the network theory, with an empirical kernel function for the rate of destruction of junctions, that proved to be effective fitting experimental rheological data for polymer melts and solutions. A review on the background of both models is provided and the two models are then compared considering simple flows. This comparison allows one to attribute in some way a microstructural nature to the parameters involved in the gPTT model. Also, a new analytical solution is derived for the Poiseuille flow of the PTT-X model.

Wenbo Wu 2021 Fluid Dyn. Res. 53 045501

For both real fish and bionic fish, a rigid anterior portion is necessary for certain functions. How does the rigid anterior portion affect the locomotion of the flexible plate? Is it true that the rigid portion is redundant? It is lack of clear cognition on these questions. In this paper, the self-propulsion of the rigid-flexible composite plate is studied numerically. We suppose that the forces are exerted on the junction point to maintain a given pitch motion of the rigid portion, the deformation of the flexible portion is consequent. The ratio between the lengths of the flexible portion and the rigid portion is changed to model the composite plate, and the effect of the stiffness of the flexible plate is investigated. It is found that the propulsive velocity and the Froude efficiency actually decrease following the increasing proportion of the rigid plate. However, the conclusion is different as the elastic energy stored in the flexible plate is considered. We find that the case with larger flexible portion is efficient for the ultra-soft posterior plate, while the case with smaller flexible portion is efficient for the stiff posterior plate. It happens to coincide with the swimming behavior of live fish. The hydrodynamic force at the tail is hindering the propulsion of the plate, which means that the motion of the tail plays a decisive role on the force distribution on the plate, rather than the thrust only produced at the tail. We think that the short ultra-soft membrane at the tail of the real fish is an important feature to improve its swimming behavior. It is expected that the study in this paper will give a further insight into the mechanism of the locomotion of fish and give some implications for the design of the soft bionic fish.

W A McMullan 2022 Fluid Dyn. Res. 54 015502

## Latest articles

Dylan Chase and Michael Cromer 2024 Fluid Dyn. Res. 56 015505

Polymers inhibit the breakup of a liquid filament thinning under surface tension. The coupling of elasticity, capillarity and inertia leads to the well-known beads-on-a-string (BOAS) formation. Additionally, under different conditions, smaller satellite drops can form along the liquid bridge between the main beads. The development of BOAS and satellite drops is controlled by the rheology of the polymer solution. In this study, we consider the roles played by finite extensibility and anisotropic drag on the formation of satellite beads. In particular, we show that the more stretching a polymer chain can undergo, satellite beads are suppressed. The latter stages of capillary thinning has been shown to result in a phase separation resulting in what is referred to as a blistering pattern. We thus also conduct simulations of an inhomogeneous dilute polymer model that considers the competing effects of diffusion and stress gradients. We show that polymer is pulled axially towards the region connecting string and bead. This simple model does not predict a phase separation, but does reveal that pinchoff could be inhibited by the buildup of polymer concentration.

Geng Guan et al 2024 Fluid Dyn. Res. 56 015504

In this study, the two-dimensional lattice Boltzmann method was employed to simulate the motions and distributions of a circular squirmer in a linear shear flow. The objective was to systematically investigate the dynamics of microorganisms or engineered squirmers in a flowing environment. We conducted multiple simulations across a range of self-propelled strengths (0.08 ⩽ α ⩽ 0.8) and squirmer type parameters (−5 ⩽ β ⩽ 5). Initially, we analyzed the swimming motions of the neutral squirmer ( β = 0) in the shear flow. Our analysis revealed two distinct distributions depending on α , i.e. near the bottom or the top plate, which differs from conventional particle behavior. Moreover, we observed that the separation point of these two distributions occurs at α c = 0.41. The puller and pusher exhibit similarities and differences, with both showing a periodic oscillation pattern. Additionally, both types reach a steady inclined pattern near the plate, with the distinction that the low-pressure region of the puller's head is captured by the plate, whereas the pusher is captured by the low-pressure region on the side of the body. The limit cycle pattern (LCP) is unique to the pusher because the response of the pressure distribution around the pusher to the flow field is different from that of a puller. The pusher starts from the initial motion and asymptotes to a closed limit cycle under the influence of flow-solid interaction. The frequency St of LCP is inversely proportional to the amplitude h * because the pusher takes longer to complete a larger limit cycle. Finally, an open limit cycle is shown, representing a swimming pattern that crosses the width of the channel.

Shivakumar Kandre and Dhiraj V Patil 2024 Fluid Dyn. Res. 56 015502

Abhishek Kumar et al 2024 Fluid Dyn. Res. 56 015501

## Review articles

Sergey V Ershkov et al 2021 Fluid Dyn. Res. 53 044501

In this paper, we present a review of featured works in the field of hydrodynamics with the main aim to clarify the ways of understanding the algorithms for solving the Navier–Stokes equations. Discussing the existing algorithms, approaches and analytical or semi-analytical methods, we especially note that important problems of stability for the exact solutions should be explored accordingly relate to this respect, e.g. exploring the case of non-stationary helical flows of the Navier–Stokes equations for incompressible fluids with variable (spatially dependent) coefficient of proportionality α between velocity and the curl field of the flow. Meanwhile, the system of Navier–Stokes equations (including continuity equation) has been successfully explored previously with respect to the existence of analytical way for presentation of non-stationary helical flows of the aforementioned type. Conditions for the stability criteria of the exact solution for such the type of flows are obtained herein in the current research, for which non-stationary helical flow with invariant Bernoulli-function is considered.

Li-Ming Chao et al 2017 Fluid Dyn. Res. 49 044501

This paper reviews recent developments in the understanding of underwater bio-mimetic propulsion. Two impressive models of underwater propulsion are considered: cruise and fast-start. First, we introduce the progression of bio-mimetic propulsion, especially underwater propulsion, where some primary conceptions are touched upon. Second, the understanding of flapping foils, considered as one of the most efficient cruise styles of aquatic animals, is introduced, where the effect of kinematics and the shape and flexibility of foils on generating thrust are elucidated respectively. Fast-start propulsion is always exhibited when predator behaviour occurs, and we provide an explicit introduction of corresponding zoological experiments and numerical simulations. We also provide some predictions about underwater bio-mimetic propulsion.

Toshiyuki Hayase 2015 Fluid Dyn. Res. 47 051201

Obtaining real flow information is important in various fields, but is a difficult issue because measurement data are usually limited in time and space, and computational results usually do not represent the exact state of real flows. Problems inherent in the realization of numerical simulation of real-world flows include the difficulty in representing exact initial and boundary conditions and the difficulty in representing unstable flow characteristics. This article reviews studies dealing with these problems. First, an overview of basic flow measurement methodologies and measurement data interpolation/approximation techniques is presented. Then, studies on methods of integrating numerical simulation and measurement, namely, four-dimensional variational data assimilation (4D-Var), Kalman filters (KFs), state observers, etc are discussed. The first problem is properly solved by these integration methodologies. The second problem can be partially solved with 4D-Var in which only initial and boundary conditions are control parameters. If an appropriate control parameter capable of modifying the dynamical structure of the model is included in the formulation of 4D-Var, unstable modes are properly suppressed and the second problem is solved. The state observer and KFs also solve the second problem by modifying mathematical models to stabilize the unstable modes of the original dynamical system by applying feedback signals. These integration methodologies are now applied in simulation of real-world flows in a wide variety of research fields. Examples are presented for basic fluid dynamics and applications in meteorology, aerospace, medicine, etc.

K Suga 2013 Fluid Dyn. Res. 45 034501

The extensive evaluation studies of the lattice Boltzmann method for micro-scale flows ( μ -flow LBM) by the author's group are summarized. For the two-dimensional test cases, force-driven Poiseuille flows, Couette flows, a combined nanochannel flow, and flows in a nanochannel with a square- or triangular cylinder are discussed. The three-dimensional (3D) test cases are nano-mesh flows and a flow between 3D bumpy walls. The reference data for the complex test flow geometries are from the molecular dynamics simulations of the Lennard-Jones fluid by the author's group. The focused flows are mainly in the slip and a part of the transitional flow regimes at Kn < 1. The evaluated schemes of the μ -flow LBMs are the lattice Bhatnagar–Gross–Krook and the multiple-relaxation time LBMs with several boundary conditions and discrete velocity models. The effects of the discrete velocity models, the wall boundary conditions, the near-wall correction models of the molecular mean free path and the regularization process are discussed to confirm the applicability and the limitations of the μ -flow LBMs for complex flow geometries.

Korinna T Allhoff and Bruno Eckhardt 2012 Fluid Dyn. Res. 44 031201

We analyze a 1 + 1-dimensional directed percolation system as a model for the spatio-temporal aspects of the turbulence transition in pipe flow and other shear flows. Space and time are discrete, and the model is characterized by two parameters: one describes the probability to remain turbulent in the next step and the other characterizes the spreading of turbulence to the neighboring cells. The transition to a persistent turbulence is evident in mean field arguments, but the actual critical values and exponents are considerably renormalized by fluctuations. Extensive numerical tests show that the model falls into the universality class of one-dimensional (1D) directed percolation. We also discuss the spreading of localized perturbations and an extension to 2D systems.

## Accepted manuscripts

Mouri et al

Through a series of experiments in a wind tunnel, we study the near-surface profiles of the mean streamwise velocity in thermally stratified boundary layers. The surface is horizontal and is smooth or roughened by rods. We heat or chill this surface to achieve that stratification. Temperature-compensated hot-film anemometry is used to measure the mean streamwise velocity. Within the transition sublayer, lying in between the surface and the constant-flux sublayer, we find that the velocity profile is always a power-law function of the height from the surface. Its exponent ranges from 0.01 to 0.2 and increases with the surface roughness and the surface temperature. We summarize these findings in a formula and discuss its applications to the atmospheric boundary layer via the so-called Reynolds number similarity.

Rastello et al

The initiation of motion of an isolated finite size particle within a rotating fluid in a tank is investigated experimentally. The study leverages on the absence of slip velocity to explore the impact rotation has on the initiation of the motion of a particle. Results show that the motion, when it occurs, is purely radial\marie{. It} is initiated when the centrifugal force acting on the particle overcomes the friction force exerted on \marie{it} by the tank bottom. A model of friction force that reproduces the experimental data quite well is proposed\marie{. It is} based on the classical Coulomb's friction law and pressure considerations. \karan{Denoting} \marie{$r_c$ as the radial position of a particle when its motion starts, the critical radius $r_{*c}=r_c/d$ essentially depends on the density ratio $\gamma$, the Froude number $Fr_{\omega}=\omega^2 d/g$ but also the ratio of the tank radius to the particle size: $\alpha = R/d$. $Fr_{\omega}$ is based on the particle diameter $d$, the shear velocity $\Delta U= \omega d$ with $\omega$ the rotation rate and $g$ \karan{the acceleration due to} gravity.} The agreement of the model with the experimental data is obtained for the same friction coefficient $\lambda =0.019$ whatever the particles\marie{. The value is} not far from the value $0.05$ generally expected for lubricated \marie{smooth} plastic/plastic friction coefficients. The model also shows that for a given tank radius a critical rotation speed exists below which, no initiation of motion can be expected.

Choudhary et al

The response of two incompressible and immiscible liquids of comparable densities at different depth ratios in a rectangular container subject to parametric sinusoidal forcing, similar to Faraday waves, has been considered in the present study. The effect of various depth ratios on the instability threshold and the flow field are investigated for (0, 2) and (0, 4) modes. Numerical simulation has been performed using OpenFOAM to solve Navier-Stokes equations. A source term is added in the interFoam module of OpenFOAM to take the effect of the oscillating container without using any dynamic mesh function. The threshold amplitude and wavenumbers are validated following the linear Floquet analysis of Kumar and Tuckerman (1994). The Floquet analysis showed a substantial shift in natural frequency (reduction) and an increase in threshold amplitude when the interface is in close proximity to the wall. The response amplitude follows a square law with the forcing amplitude for all the depth ratios considered in the present study. The wave amplitude response above the threshold curve is found to be an exponential function of liquid depths and forcing parameters.

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- 1986-present Fluid Dynamics Research doi: 10.1088/issn.1873-7005 Online ISSN: 1873-7005 Print ISSN: 0169-5983

Published 6 issues per year

ISSN Print: 2152-5102

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Due to current covid19 situation and as a measure of abundant precaution, our member services centre are operating with minimum staff, eissn: 2577-8242, fluid mechanics research international journal, latest articles, non-seismic and non-conventional methods of exploration for oil and gas in cuba: a review.

Manuel E Pardo Echarte, Osvaldo Rodríguez Morán

Fluid Mechanics Research International Journal - May 23, 2023

## Application of random forest-based decision tree approach for modeling fully developed turbulent flow in rough pipes

Kaan Yetilmezsoy

Fluid Mechanics Research International Journal - April 05, 2023

## Editorial on the need and advantages of nano and smart fluids in the 21 st century

Merouane Salhi

Fluid Mechanics Research International Journal - March 28, 2023

## Magnetohydrodynamic mixed convection in a nanofluid filled tubular enclosure

Mohammad Mokaddes Ali

Fluid Mechanics Research International Journal - March 19, 2020

## Introduction of explicit equations for the estimation of surface tension, specific weight, and kinematic viscosity of water as a function of temperature

Fluid Mechanics Research International Journal - February 5, 2020

## Experimental investigation of the kinetics properties of the nano crude oil in a vertical line

Reza Behzadi, Farshad Farahbod

Fluid Mechanics Research International Journal - February 3, 2020

## High-performance airfoil with low reynolds-number dependence on aerodynamic characteristics

Masayuki Anyoji, Daiki Hamada

Fluid Mechanics Research International Journal - August 19, 2019

## Performance enhancement of unitary and packaged air conditioners with phase change material

Pereddy Nageswara Reddy

Fluid Mechanics Research International Journal - June 28, 2019

## Aerodynamic and structural analysis of bio-mimetic corrugated wing

Md Akhtar khan, 1 Chinmaya Padhy 2

Fluid Mechanics Research International Journal - June 26, 2019

## Investigation of particle size effect on thermal conductivity enhancement of distilled water-Al 2 O 3 nano fluids

YD Kokate, 1 SB Sonawane 2

Fluid Mechanics Research International Journal - June 24, 2019

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## Computer Science > Machine Learning

Title: rolling diffusion models.

Abstract: Diffusion models have recently been increasingly applied to temporal data such as video, fluid mechanics simulations, or climate data. These methods generally treat subsequent frames equally regarding the amount of noise in the diffusion process. This paper explores Rolling Diffusion: a new approach that uses a sliding window denoising process. It ensures that the diffusion process progressively corrupts through time by assigning more noise to frames that appear later in a sequence, reflecting greater uncertainty about the future as the generation process unfolds. Empirically, we show that when the temporal dynamics are complex, Rolling Diffusion is superior to standard diffusion. In particular, this result is demonstrated in a video prediction task using the Kinetics-600 video dataset and in a chaotic fluid dynamics forecasting experiment.

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This Special Issue is a collection of papers from some of the leading researchers discussing new findings or cutting-edge developments relating to all aspects of fluid mechanics. Amongst the various forces acting on particles in a fluid, the Basset force, related to the fluid inertial effects, is one of the most difficult to study.

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The Japan Society of Fluid Mechanics (JSFM) originated from a voluntary party of researchers working on fluid mechanics in 1968. The objectives of the society were to discuss about scientific and engineering problems relevant to fluid motion among researchers working in Physics, Engineering and the interdisciplinary fields and to assist in their research activities.

Recent Advances in Fluid Mechanics: Feature Papers by Mehrdad Massoudi U. S. Department of Energy, National Energy Technology Laboratory (NETL), Pittsburgh, PA 15236, USA Fluids 2021, 6 (4), 143; https://doi.org/10.3390/fluids6040143 Submission received: 1 April 2021 / Accepted: 3 April 2021 / Published: 7 April 2021

Issue 1, January 2024 View This Issue Focus and Coverage Physics of Fluids features intriguing original theoretical, computational, and experimental publications to deepen our understanding of the dynamics of gases, liquids, or complex fluids. Read more about the journal Editor-in-Chief Alan Jeffrey Giacomin View Full Editorial Board RSS feed

Published 2009 Engineering, Medicine, Physics TLDR Planar digital Particle Image Velocimetry (PIV) measurements were performed in a scaled model of a tuning fork shaped average human carotid artery bifurcation to simulate in-vivo flow conditions and to match the refractive index of the flow phantom. Expand View via Publisher cds.cern.ch

Published by IOP Publishing on behalf of the Japan Society of Fluid Mechanics, Fluid Dynamics Research covers original and creative works in all fields of fluid dynamics Submit an article RSS Sign up for new issue notifications Current volume Number 5, October 2023 Number 4, August 2023 Number 3, June 2023 Number 2, April 2023

This material is taken from the book Research Trends in Fluid Dynamics, editors J.L. Lumley, Andreas Acrivos, L. Gary Leal, and Sidney Leibovich, c 1996 by the American Institute of Physics, Woodbury, New York. Reprinted with permission. Note: In May 1997, AIP Press turned over its book publishing business to Springer-Verlag, New York.

Fluids. , Volume 6, Issue 4 (April 2021) - 35 articles. Cover Story ( view full-size image ): The stability of surface water waves impacts the design of harbor structures, experimental facilities, and tells us about the evolution of tsunamis and rogue waves. Recently, instabilities with respect to high-frequency disturbances of periodic ...

The topics covered include fluid mechanics and applications, microfluidics and nanofluidics, numerical methods for multiphase flows, cavitation, combustion, fluid-particle interactions in...

in modern physics. Fluid mechanics provides a mechanism to determine the macroscopic motion of the system. These equations are additionally complicated when we consider a uid moving in a curved spacetime. The following paper discusses the derivation of the relativistic equations of motion, uses

For the past 20 years, Fluid Mechanics Research (prior to 1992 Fluid Mechanics-Soviet Research) has offered broad coverage of the entire field of fluid mechanics including flow of compressible and incompressible fluids, vapor-liquid and slurry flows, turbulence, waves, boundary layers, wakes, channel and nozzle flow, fluid-structure interaction, lubrication, flow in porous media, flow through ...

Open Channel Flow over a Permeable River Bed. G. Mbah Cyril Ifeany Udogu. Environmental Science, Engineering. 2015. This paper presents results of a modeled open channel flow through a porous media (River). In the model, we considered water as an incompressible fluid; the flow as steady and uniform; the system is…. Expand.

4 Chapter 1—Introduction to Fluid Mechanics A simple apparatus for shearing a ﬂuid is shown in Fig. 1.1. The ﬂuid is contained between two concentric cylinders; the outer cylinder is stationary, and the inner one (of radiusR) is rotated steadily with an angular velocityω.

This journal dealing with the translations of important theoretical and experimental papers on chemical engineering, fluid mechanics, meteorology, biology, aeronautics and both non-newtonian flow, non-newtonian fluid mechanics etc. FMRIJ invites research papers, review articles, short communications, case reports, mini-reviews, opinions, letter ...

Journal of Physics Conference Series DOI: CC BY 3.0 Authors: Ruqiong Qin Chunyi Duan Abstract and Figures Bernoulli equation is one of the most important theories of fluid mechanics, it...

Journal of Fluid Mechanics Authors: Emmanuel Germaine Laurent Mydlarski McGill University Luca Cortelezzi Non-dimensionalized mean temperature excess profiles for two line source locations.

Download PDF Abstract: Diffusion models have recently been increasingly applied to temporal data such as video, fluid mechanics simulations, or climate data. These methods generally treat subsequent frames equally regarding the amount of noise in the diffusion process. This paper explores Rolling Diffusion: a new approach that uses a sliding window denoising process.

This paper reviews ML and DL research for fluid dynamics, presents algorithmic challenges and discusses potential future directions. Discover the world's research Content uploaded by...