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Fluids
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Particle-Based Simulation of Fluid Dynamics
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Particle-Based Simulation of Fluid Dynamics

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (20 December 2020) | Viewed by 10225

Special Issue Editor

Dr. Ahmad Jabbarzadeh

E-Mail Website
Guest Editor
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
Interests: molecular and mesoscale simulations; microfluidics; nanofluidics; nanoparticles; polymer crystallization; tribology; rheology; computational nanotechnology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue covers new research in using particle-based methods such as molecular dynamics (MD), dissipative particle dynamics (DPD), lattice-Boltzmann (LB), smoothed particle hydrodynamics (SPH), and other relevant methods in the simulation of flow at micro/nano/macro scales.

In a continuum-based approach in traditional computational fluid dynamics (CFD), the simulation is done through discretisation of appropriate partial differential equations (such as Navier–Stokes), and subsequent solution to obtain flow field information. By contrast, in particle-based methods, the flow information arises naturally through the interaction of particles. While traditional CFD has matured and left its marks with successful application in investigating the flow at the macroscale, it has limitations and does not work in some situations—for example, due to lack of appropriate constitutive equations, for multiphase flows, for flow at the nanoscale, and through complex geometries, and when there are fast variations of spatiotemporal properties of the flow. In such situations, particle-based methods offer an alternative approach.

In this Special Issue, we would like to bring together some of the latest progress in the field and provide a stepping stone for future progress in this filed. Contributions in the form of original new research or reviews of the latest progress in the field are welcome.

Prof. Ahmad Jabbarzadeh
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • molecular dynamics (MD)
  • dissipative particle dynamics (DPD)
  • lattice–Boltzmann (LB)
  • smoothed particle hydrodynamics(SPH)
  • particle-based methods
  • hybrid methods
  • multiscale simulations
  • nanofluidics
  • microfluidics
  • slip

Published Papers (2 papers)

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Research

29 pages, 14000 KiB  
Article
Experimental Investigation of Vortex-Tube Streamwise-Vorticity Characteristics and Interaction Effects with a Finite-Aspect-Ratio Wing
by Bailey Carlson, Al Habib Ullah and Jordi Estevadeordal
Fluids 2020, 5(3), 122; https://doi.org/10.3390/fluids5030122 - 24 Jul 2020
Viewed by 5799
Abstract
An experimental study is conducted to analyze a streamwise-oriented vortex and investigate the unsteady interaction with a finite-aspect-ratio wing. A pressurized vortex tube is used to generate streamwise vortices in a wind tunnel and the resulting flow behavior is analyzed. The vortex tube, [...] Read more.
An experimental study is conducted to analyze a streamwise-oriented vortex and investigate the unsteady interaction with a finite-aspect-ratio wing. A pressurized vortex tube is used to generate streamwise vortices in a wind tunnel and the resulting flow behavior is analyzed. The vortex tube, operated at various pressures, yields flows that evolve downstream under several freestream wind tunnel speeds. Flow measurements are performed using two- and three- dimensional (2D and 3D) particle image velocimetry to observe vortices and their freestream interactions from which velocity and vorticity data are comparatively analyzed. Results indicate that vortex velocity greater than freestream flow velocity is a primary factor in maintaining vortex structures further downstream, while increased supply pressure and reduced freestream velocity also reduce vortex dissipation rate. The generated streamwise-oriented vortex is also impinged on a finite-aspect-ratio airfoil wing with a cross-section of standard NACA0012 airfoil. The wingtip-aligned vortex is shown to investigate the interaction of the streamwise vortex and the wingtip vortex region. The results indicate that the vorticity at the high vortex-tube pressure has a significant effect on the boundary layer of airfoil. Full article
(This article belongs to the Special Issue Particle-Based Simulation of Fluid Dynamics)
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29 pages, 6132 KiB  
Article
Numerical Study of Flow and Particle Deposition in Wall-Flow Filters with Intact or Damaged Exit
by Chris D. Dritselis, Fotini Tzorbatzoglou, Marios Mastrokalos and Onoufrios Haralampous
Fluids 2019, 4(4), 201; https://doi.org/10.3390/fluids4040201 - 2 Dec 2019
Cited by 3 | Viewed by 3520
Abstract
We examine the time-dependent three-dimensional gas-particle flow in an intact wall-flow filter consisting of channels alternatively plugged at each end and a partially damaged filter in which the rear plugs are removed. Our focus is placed on highlighting the differences in the flow [...] Read more.
We examine the time-dependent three-dimensional gas-particle flow in an intact wall-flow filter consisting of channels alternatively plugged at each end and a partially damaged filter in which the rear plugs are removed. Our focus is placed on highlighting the differences in the flow pattern and the deposition process between the two geometries. The Navier–Stokes equations are solved for the fluid flow coupled with a Brinkman/Forchheimmer model in order to simulate the flow in the porous walls and plugs. Discrete particle simulation is utilized to determine the nanoparticle trajectories. Using this scheme, we are able to characterize the main features of the flow fields developing in the intact and damaged filters with respect to the Reynolds number and identify those affecting the transport and deposition of particles that have three representative response times. We present fluid velocity iso-contours, which describe the flow regimes inside the channels, as well as in regions upstream and downstream of them. We provide evidence of local recirculating bubbles at the entrance of the channels and after their exit, whereas back-flow occurs in front of the rear plugs of the intact channels. We show that the flow leaves the channels as strong jets that may break up for certain flow parameters, leading to turbulence with features that depend on the presence of the rear plugs. The removal of the rear plugs affects the flow distribution, which, in turn influences the flow rates along the channels and through the walls. We describe the particle trajectories and the topology of deposited particles and show that particles follow closely the streamlines, which may cross the surface of permeable walls for both flow configurations. The distribution of deposited particles resembles the spatial variation of the through-wall flow rate, exhibiting two peak values at both ends of the intact filter channel, and one local maximum near the entrance of the damaged filter channel that is diminished at the exit. We also investigate in detail the particle deposition on the frontal face and indicate that particle accumulation at the edges of the entrance is favored for particles with low response times in flows with high fluid mass rates for both intact and damaged filters. Finally, we examine the filtration efficiency for the defective channels without rear plugs and show that fewer particles are captured as the Reynolds number is increased. A smaller reduction of the filtration efficiency is also predicted with increasing particle size. Full article
(This article belongs to the Special Issue Particle-Based Simulation of Fluid Dynamics)
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