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Processes
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Complex Fluid Dynamics Modeling and Simulation, 2nd Edition
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Complex Fluid Dynamics Modeling and Simulation, 2nd Edition

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Process Control and Monitoring".

Deadline for manuscript submissions: 20 December 2025 | Viewed by 2145

Special Issue Editor

Dr. Leila Pakzad

E-Mail Website
Guest Editor
Department of Chemical Engineering, Lakehead University, Thunder Bay, ON P7B5E1, Canada
Interests: multi-phase flow; non-Newtonian fluids; computational fluid dynamics; mixing process; flow visualization techniques (tomography, particle size analyzer—SOPAT); oscillatory baffled reactor (OBR); bubble column
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The hydrodynamics of complex fluids are of importance in such science and engineering fields as material science, fluid mechanics, environmental engineering, mechanical engineering, biological engineering, and chemical engineering. Due to the complicated behavior of complex fluids, conventional modeling is often not accurate. Complex fluids can be found in systems such as multiphase flows, colloidal dispersions, and polymeric liquids. These systems are known to exhibit such rheological flow behaviors as shear thinning, yield pseudoplasticity, shear thickening, and viscoelasticity.

Although there is a considerable amount of experimental and theoretical studies on the rheology and hydrodynamics of complex fluids, performing computational fluid dynamics (CFD) modeling and simulations is not yet very common for complex fluids. There are various challenges linked to this type of modeling, such as the requirement for the accurate presentation of complex geometries, the complexity of the fluids, the possible interactions among the phases and particles, the possible reactions within the system, and the dispersion and suspensions of gases/liquids and solid particles, respectively.

We congenially invite you to contribute to this Special Issue, which will feature the latest developments in the CFD modeling and simulation of complex fluids in environmental engineering, mechanical engineering, chemical and biological engineering, materials processing, advanced manufacturing, petroleum engineering, food, pharmaceuticals, cosmetics processing, and other related areas. Contributions describing the application of CFD for complex fluids; the development of new models involving CFD; innovations in numerical methods/algorithms; and the integration of CFD modeling and the simulation of complex fluids in process design, control, and optimization are all welcome. Both original research and topical reviews will be considered (authors interested in contributing a review article are asked to discuss its topic scope with the Guest Editors as early as possible). Contributions that feature the methods or applications of CFD for addressing the behavior of complex fluids are particularly welcome.

Dr. Leila Pakzad
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. 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 2400 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

  • computational fluid dynamics (CFD)
  • complex fluids
  • multiphase flow
  • dispersion modeling
  • gas/liquid/solid modeling
  • chemical reaction engineering
  • mixing
  • process scale-up
  • multiphysics modeling
  • multiscale simulation

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Published Papers (2 papers)

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17 pages, 7206 KiB  
Article
The Influence of Pre-Lift Gate Opening on the Internal and External Flow Characteristics During the Startup Process of an Axial Flow Pump
by You Fu and Lingling Deng
Processes 2024, 12(9), 1984; https://doi.org/10.3390/pr12091984 - 14 Sep 2024
Viewed by 863
Abstract
This paper focuses on a vertical axial flow pump and employs a 1D-3D coupling method to investigate the effects of different gate pre-opening angles on the internal and external flow characteristics of the axial flow pump during startup. Through comparative analysis, the following [...] Read more.
This paper focuses on a vertical axial flow pump and employs a 1D-3D coupling method to investigate the effects of different gate pre-opening angles on the internal and external flow characteristics of the axial flow pump during startup. Through comparative analysis, the following conclusions are drawn: In the study, a fully open gate is defined as 1, while a fully closed gate is defined as 0. When starting the axial flow pump with different valve pre-opening degrees, backflow occurs within the first 20 s of startup, and the backflow rate inside the pump gradually increases with the increase in the valve pre-opening degree. At a valve pre-opening degree of 0.6, the maximum backflow rate inside the pump reaches 5.89% of the rated flow rate. When starting the pump with the valve fully open, the maximum backflow rate reaches 10.98% of the rated flow rate, and the efficiency is affected by the backflow rate. The valve pre-opening degree has little impact on the axial force acting on the impeller during startup. When starting with a valve pre-opening degree of 0.6, the internal pressure difference in the pump is minimized. Within the first 20 s of startup, the internal pressure difference in the impeller is 28.96% higher and the flow velocity is 14.62% higher with valve pre-opening degrees of 0.8 and 1.0 compared to a 0.6 degree opening. During the initial stage of pump startup, with valve pre-opening degrees of 0.8 and 1.0, the pressure fluctuation amplitude inside the pump is minimal, with maximum relative amplitudes of only 0.621 and 0.525, which are 41.00% and 28.51% lower than the maximum amplitudes at 0 and 0.2 degrees, respectively. In summary, the peak pressure inside the pump is minimized when the valve pre-opening degree is around 0.8, while the pressure difference and flow velocity are relatively lower at a pre-opening degree of 0.6. It is recommended to start the pump with a valve pre-opening degree of around 0.6 to 0.8. Full article
(This article belongs to the Special Issue Complex Fluid Dynamics Modeling and Simulation, 2nd Edition)
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27 pages, 17256 KiB  
Article
Influence of Rotation and Viscosity on Parallel Rolls of Electrically Conducting Fluid
by G. Srinivas, Y. Rameshwar and D. Laroze
Processes 2024, 12(9), 1882; https://doi.org/10.3390/pr12091882 - 2 Sep 2024
Viewed by 892
Abstract
Rayleigh–Bénard convection is a fundamental fluid dynamics phenomenon that significantly influences heat transfer in various natural and industrial processes, such as geophysical dynamics in the Earth’s liquid core and the performance of heat exchangers. Understanding the behavior of conductive fluids under the influence [...] Read more.
Rayleigh–Bénard convection is a fundamental fluid dynamics phenomenon that significantly influences heat transfer in various natural and industrial processes, such as geophysical dynamics in the Earth’s liquid core and the performance of heat exchangers. Understanding the behavior of conductive fluids under the influence of heating, rotation, and magnetic fields is critical for improving thermal management systems. Utilizing the Boussinesq approximation, this study theoretically examines the nonlinear convection of a planar layer of conductive liquid that is heated from below and subjected to rotation about a vertical axis in the presence of a magnetic field. We focus on the onset of stationary convection as the temperature difference applied across the planar layer increases. Our theoretical approach investigates the formation of parallel rolls aligned with the magnetic field under free–free boundary conditions. To analyze the system of nonlinear equations, we expand the dependent variables in a series of orthogonal functions and express the coefficients of these functions as power series in a parameter ϵ. A solution for this nonlinear problem is derived through Fourier analysis of perturbations, extending to O(ϵ8), which allows for a detailed visualization of the parallel rolls. Graphical results are presented to explore the dependence of the Nusselt number on the Rayleigh number (R) and Ekman number (E). We observe that both the local Nusselt number and average Nusselt number increase as the Ekman number decreases. Furthermore, the flow appears to become more deformed as E decreases, suggesting an increased influence of external factors such as rotation. This deformation may enhance mixing within the fluid, thereby improving heat transfer between different regions. Full article
(This article belongs to the Special Issue Complex Fluid Dynamics Modeling and Simulation, 2nd Edition)
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