Special Issue "Modeling, Simulation and Computation on Dynamics of Complex Fluids"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Computational Methods".

Deadline for manuscript submissions: 30 May 2020.

Special Issue Editors

Prof. Dr. Gabriella Bognár
E-Mail Website
Guest Editor
Faculty of Mechanical Engineering and Informatics, Institute of Machine and Product Design, University of Miskolc (UM), 3515 Miskolc, Hungary
Interests: partial differential equations; boundary value problems; non-Newtonian fluid flows; tribology; surface pattern formation; numerical and analytic solutions
Dr. Krisztian Hriczo
E-Mail Website
Guest Editor
Faculty of Mechanical Engineering and Informatics, Institute of Machine and Product Design, University of Miskolc (UM), 3515 Miskolc, Hungary
Interests: differential equations of transport phenomena; non-Newtonian fluid flows; numerical and analytic solutions

Special Issue Information

Dear Colleagues,

Computational models of fluid flows with state-of-the-art knowledge in continuum concepts and associated fluid dynamics are fundamental to advancing the basic understanding and prediction of fluid dynamics. The field of application are diverse and range from, e.g., natural and industrial processes to biology, geology, and the problem areas involving heat and mass transfer, complex geometries, multiphase flows, chemical reactions, and non-Newtonian stress relations. There is a considerable interest in the modeling of fluids, such as polymer solutions, suspensions and emulsions. Particularly challenging is the identification of appropriate model systems that provide insight into the general principles of particle dynamics in complex fluids.

Effective numerical methods to physical models have to be developed in order to be able to perform direct numerical simulations that allow sufficiently accurate representations and insight in realistic flow conditions and geometries.

This Special Issue on “Modeling, Simulation, and Computation on Dynamics of Complex Fluids” aims to highlight new advances in the development and application of computational fluid modeling.

Prof. Dr. Gabriella Bognár
Dr. Krisztian Hriczo
Guest Editors

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 papers will be 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. Processes 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 1400 CHF (Swiss Francs). Please note that for papers submitted after 30 June 2020 an APC of 1500 CHF applies. 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

  • mathematical modelling
  • fluid flows
  • Newtonian fluids
  • non-Newtonian fluids
  • viscoelastic fluids
  • numerical and analytic solutions

Published Papers (5 papers)

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Research

Open AccessArticle
Optimization of a Confined Jet Geometry to Improve Film Cooling Performance Using Response Surface Methodology (RSM)
Processes 2020, 8(2), 232; https://doi.org/10.3390/pr8020232 (registering DOI) - 18 Feb 2020
Abstract
This study investigates the interrelated parameters affecting heat transfer from a hot gas flowing on a flat plate while cool air is injected adjacent to the flat plate. The cool air forms an air blanket that shield the flat plate from the hot [...] Read more.
This study investigates the interrelated parameters affecting heat transfer from a hot gas flowing on a flat plate while cool air is injected adjacent to the flat plate. The cool air forms an air blanket that shield the flat plate from the hot gas flow. The cool air is blown from a confined jet and is simulated using a two-dimensional numerical model under three variable parameters; namely, blowing ratio, jet angle and density ratio. The interrelations between these parameters are evaluated to properly understand their effects on heat transfer. The analyses are conducted using ANSYS-Fluent, and the performance of the air blanket is reported using local and average adiabatic film cooling effectiveness (AFCE). The interrelation between these parameters and the AFCE is established through a statistical method known as response surface methodology (RSM). The RSM model shows that the AFCE has a second order relation with the blowing ratio and a first order relation with both jet angle and density ratio. Also, it is found that the highest average AFCE is reached at an injection angle of 30 degree, a density ratio of 1.2 and a blowing ratio of 1.8. Full article
(This article belongs to the Special Issue Modeling, Simulation and Computation on Dynamics of Complex Fluids)
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Open AccessArticle
A Finite Element Simulation of the Active and Passive Controls of the MHD Effect on an Axisymmetric Nanofluid Flow with Thermo-Diffusion over a Radially Stretched Sheet
Processes 2020, 8(2), 207; https://doi.org/10.3390/pr8020207 - 07 Feb 2020
Abstract
The present study investigated the steady magnetohydrodynamics of the axisymmetric flow of a incompressible, viscous, electricity-conducting nanofluid with convective boundary conditions and thermo-diffusion over a radially stretched surface. The nanoparticles’ volume fraction was passively controlled on the boundary, rather than actively controlled. The [...] Read more.
The present study investigated the steady magnetohydrodynamics of the axisymmetric flow of a incompressible, viscous, electricity-conducting nanofluid with convective boundary conditions and thermo-diffusion over a radially stretched surface. The nanoparticles’ volume fraction was passively controlled on the boundary, rather than actively controlled. The governing non-linear partial differential equations were transformed into a system of nonlinear, ordinary differential equations with the aid of similarity transformations which were solved numerically, using the very efficient variational finite element method. The coefficient of skin friction and rate of heat transfer, and an exact solution of fluid flow velocity, were contrasted with the numerical solution gotten by FEM. Excellent agreement between the numerical and exact solutions was observed. The influences of various physical parameters on the velocity, temperature, and solutal and nanoparticle concentration profiles are discussed by the aid of graphs and tables. Additionally, authentication of the convergence of the numerical consequences acquired by the finite element method and the computations was acquired by decreasing the mesh level. This exploration is significant for the higher temperature of nanomaterial privileging technology. Full article
(This article belongs to the Special Issue Modeling, Simulation and Computation on Dynamics of Complex Fluids)
Open AccessArticle
Numerical Analysis of Supersonic Impinging Jet Flows of Particle-Gas Two Phases
Processes 2020, 8(2), 191; https://doi.org/10.3390/pr8020191 - 05 Feb 2020
Abstract
Supersonic impinging jet flows always occur when aircrafts start short takeoff and vertical landing from the ground. Supersonic flows with residues produced by chemical reaction of fuel mixture have the potential of reducing aircraft performance and landing ground. The adverse flow conditions such [...] Read more.
Supersonic impinging jet flows always occur when aircrafts start short takeoff and vertical landing from the ground. Supersonic flows with residues produced by chemical reaction of fuel mixture have the potential of reducing aircraft performance and landing ground. The adverse flow conditions such as impinging force, high noise spectrum, and high shear stress always take place. Due to rare data on particle-gas impinging jet flows to date, three-dimensional numerical simulations were carried out to investigate supersonic impinging jet flows of particle-gas two phases in the present studies. A convergent sonic nozzle and a convergent-divergent supersonic nozzle were used to induce supersonic impinging jet flows. Discrete phase model (DPM), where interaction with continuous phase and two-way turbulence coupling model were considered, was used to simulate particle-gas flows. Effects of different particle diameter and Stokes number were investigated. Particle mass loading of 10% were considered for all simulations. Gas and particle velocity contours, wall shear stress, and impinging force on the ground surface were obtained to describe different phenomena inside impinging and wall jet flows of single gas phase and gas-particle two phases. Full article
(This article belongs to the Special Issue Modeling, Simulation and Computation on Dynamics of Complex Fluids)
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Open AccessArticle
Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump
Processes 2020, 8(1), 122; https://doi.org/10.3390/pr8010122 - 17 Jan 2020
Abstract
In order to make the centrifugal pump run efficiently and stably under various working conditions, the influences of the incoming vortex flow in the inlet pipe on the main flow in the impeller is studied numerically, based on the k ω SST [...] Read more.
In order to make the centrifugal pump run efficiently and stably under various working conditions, the influences of the incoming vortex flow in the inlet pipe on the main flow in the impeller is studied numerically, based on the k ω SST turbulence model. Some guide vanes with different offset angle were added to change the statistical characteristic of the internal flow in the inlet pipe of the centrifugal pump. Both contour distributions of internal flow and statistical results of external performance are obtained and analyzed. The results show that the existence of vanes can divide the large vortex because of the reversed flow from the rotating impeller at low flow rate conditions into small vortices, which are easier to dissipate, make the velocity and pressure distribution more uniform, improve the stability of the flow in the impeller, reduce the hydraulic loss, and improve the hydraulic performance of the pump. The pump with vanes of offset angle 25° has a small pressure pulsation amplitude at each monitoring point. Comparing with the performance of the original pump, the head increased by around 2% and efficiency increased by around 2.5% of the pump with vanes of offset angle 25°. Full article
(This article belongs to the Special Issue Modeling, Simulation and Computation on Dynamics of Complex Fluids)
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Open AccessArticle
Numerical Analysis to the Effect of Guiding Plate on Flow Characteristics in a Ball Valve
Processes 2020, 8(1), 69; https://doi.org/10.3390/pr8010069 - 03 Jan 2020
Abstract
When internal flows go through a valve with a small opening degree, high-speed jet flows are induced, which causes the erosion of the valve core and affects the stability of the flow field. Setting guiding plates in the valve behind the valve core [...] Read more.
When internal flows go through a valve with a small opening degree, high-speed jet flows are induced, which causes the erosion of the valve core and affects the stability of the flow field. Setting guiding plates in the valve behind the valve core has the function of reducing the adverse effect of high-speed jet flows. In this work, numerical simulations were carried out to investigate the effect of the guiding plate on flow and resistance coefficient, velocity and pressure distributions and flow stability downstream of the valve. The number of guiding plates was changed from 0 to 3 and the opening degree was varied from 0 to 100% at intervals of 10%. A guiding plate with holes in it plays the role of bypassing and guiding flow. Under the action of the guiding plate, the flow coefficient obviously decreases, the gap flow between the valve core and the valve wall in the top of the valve are modified, and the gap flow even disappeared in the valve with 3 guiding plates. It was found that setting the guiding plate can improve the performance of the ball valve, reducing the internal erosion and increasing the stability of valve downstream flow efficiently. Full article
(This article belongs to the Special Issue Modeling, Simulation and Computation on Dynamics of Complex Fluids)
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