Fluid Mechanics, 2nd Edition

Topic Information

Dear Colleagues,

This topic is a continuation of the previous successful topic “Advances in Intelligent Construction, Operation and Maintenance” (https://www.mdpi.com/topics/fluid).

Fluid mechanics has been a topic of great practical and research interest for many centuries. Yet, this field of research is still young and vigorous, thanks to the tremendous opportunities that have been brought forward by modern computational and experimental techniques.

It is an amazingly wide and exciting area of knowledge, offering the possibility of applications in virtually every aspect of our lives. The present topical publication project offers the opportunity to communicate recent research results and application experiences across a wide range of sciences.

We are pleased to invite the research community to submit research or review articles on, but not limited to, the following relevant topics within the fluid mechanics space:

• Modern mathematical and computational methods for the investigation of fluid mechanics problems;
• Modern experimental techniques applicable to fluid mechanics;
• Instability and turbulence;
• Single- (fluid, gas) and multi-phase flows;
• Rheology;
• Lubrication;
• Magnetohydrodynamics;
• Plasma dynamics;
• Internal and external flows;
• Geophysical flows;
• Flows in industrial devices;
• Microfluid flows;
• Nanofluid flows;
• Filtration flows;
• Flows in biology and medicine;
• Flows of chemically reactive systems;
• Flows in aerospace applications;
• Compressible flows with shock waves and flows associated with explosions;
• Astrophysical flows.

Dr. Sihui Hong
Prof. Dr. Chaobin Dang
Prof. Dr. Shuangfeng Wang
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Applied Sciences applsci	2.5	5.3	2011	17.8 Days	CHF 2400	Submit
Energies energies	3.0	6.2	2008	17.5 Days	CHF 2600	Submit
Fluids fluids	1.8	3.4	2016	22.1 Days	CHF 1800	Submit
Materials materials	3.1	5.8	2008	15.5 Days	CHF 2600	Submit
Mathematics mathematics	2.3	4.0	2013	17.1 Days	CHF 2600	Submit

MDPI Topics is cooperating with Preprints.org and has built a direct connection between MDPI journals and Preprints.org. Authors are encouraged to enjoy the benefits by posting a preprint at Preprints.org prior to publication:

1. Immediately share your ideas ahead of publication and establish your research priority;
2. Protect your idea from being stolen with this time-stamped preprint article;
3. Enhance the exposure and impact of your research;
4. Receive feedback from your peers in advance;
5. Have it indexed in Web of Science (Preprint Citation Index), Google Scholar, Crossref, SHARE, PrePubMed, Scilit and Europe PMC.

Published Papers (3 papers)

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All Applied Sciences Energies Fluids Materials Mathematics

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23 pages, 1999 KiB  

Open AccessArticle

Numerical Solution of the Newtonian Plane Couette Flow with Linear Dynamic Wall Slip

by Muner M. Abou Hasan, Ethar A. A. Ahmed, Ahmed F. Ghaleb, Moustafa S. Abou-Dina and Georgios C. Georgiou

Fluids 2024, 9(8), 172; https://doi.org/10.3390/fluids9080172 - 27 Jul 2024

Viewed by 423

Abstract

An efficient numerical approach based on weighted-average finite differences is used to solve the Newtonian plane Couette flow with wall slip, obeying a dynamic slip law that generalizes the Navier slip law with the inclusion of a relaxation term. Slip is exhibited only [...] Read more.

An efficient numerical approach based on weighted-average finite differences is used to solve the Newtonian plane Couette flow with wall slip, obeying a dynamic slip law that generalizes the Navier slip law with the inclusion of a relaxation term. Slip is exhibited only along the fixed lower plate, and the motion is triggered by the motion of the upper plate. Three different cases are considered for the motion of the moving plate, i.e., constant speed, oscillating speed, and a single-period sinusoidal speed. The velocity and the volumetric flow rate are calculated in all cases and comparisons are made with the results of other methods and available results in the literature. The numerical outcomes confirm the damping with time and the lagging effects arising from the Navier and dynamic wall slip conditions and demonstrate the hysteretic behavior of the slip velocity in following the harmonic boundary motion. Full article

(This article belongs to the Topic Fluid Mechanics, 2nd Edition)

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14 pages, 10050 KiB  

Open AccessArticle

Study on the Tribological Properties of Multilayer Concentric Hexagonal Laser Texturing on Rubber Surfaces of Screw Pumps

by Xinfu Liu, Xinglong Niu, Chunhua Liu, Xiangzhi Shi, Yi Sun, Zhongxian Hao, Shouzhi Huang, Yuan Wang and Hua Tao

Materials 2024, 17(15), 3708; https://doi.org/10.3390/ma17153708 - 26 Jul 2024

Viewed by 358

Abstract

Given the friction and drag reduction effects observed in various biological hexagonal structures in nature, a new design was implemented on the rubber surface of the stator of a submersible screw pump. This design featured a multilayer concentric hexagonal groove structure. Furthermore, a [...] Read more.

Given the friction and drag reduction effects observed in various biological hexagonal structures in nature, a new design was implemented on the rubber surface of the stator of a submersible screw pump. This design featured a multilayer concentric hexagonal groove structure. Furthermore, a composite multilayer hexagonal structure integrating grooves and pits was also developed and applied. This study investigated the influence of groove layer number, groove depth, pit depth, and multilayer hexagonal groove texture arrangement on the rubber surface flow characteristics. Additionally, the pressure field state, the degree of influence on the oil film-bearing capacity, and the biomimetic and hydrodynamic lubrication theories were tested using the finite element analysis method. Tribological experiments were conducted on nanosecond laser-processed rubber textures under simulated liquid lubrication conditions, reflecting actual shale oil well experiments. These experiments aimed to investigate the influence of multilayer hexagonal shape parameters on the tribological characteristics of the stator-rotor friction pair of a submersible screw pump. The results indicated that with a constant overall size, a multilayer hexagonal structure with ~0.1 mm groove depth enhanced the oil film-bearing capacity, providing significant friction and drag reduction. For composite textures, a deeper pit depth within the study area enhanced the oil film-bearing capacity. Furthermore, a gradient arrangement of groove textures featuring wider outer grooves and shallower depth exhibited superior performance in terms of bearing capacity. Full article

(This article belongs to the Topic Fluid Mechanics, 2nd Edition)

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15 pages, 842 KiB  

Open AccessArticle

A Physical Insight into Computational Fluid Dynamics and Heat Transfer

by Sergey I. Martynenko and Aleksey Yu. Varaksin

Mathematics 2024, 12(13), 2122; https://doi.org/10.3390/math12132122 - 6 Jul 2024

Viewed by 363

Abstract

Mathematical equations that describe all physical processes are valid only under certain assumptions. One of them is the minimum scales used for the given description. In fact, this prohibits the use of derivatives in the mathematical models of the physical processes. This article [...] Read more.

Mathematical equations that describe all physical processes are valid only under certain assumptions. One of them is the minimum scales used for the given description. In fact, this prohibits the use of derivatives in the mathematical models of the physical processes. This article represents a derivative-free approach for the mathematical modelling. The proposed approach for CFD and numerical heat transfer is based on the conservation and phenomenological laws, and physical constraints on the minimum problem-dependent spatial and temporal scales (for example, on the average free path of molecules and the average time of their collisions for gases). This leads to the derivative-free governing equations (the discontinuum approximation) that are very convenient for numerical simulation. The theoretical analysis of governing equations describing the fundamental conservation laws in the continuum and discontinuum approximations is given. The article demonstrates the derivative-free approach based on the correctly defined macroparameters (pressure, temperature, density, etc.) for the mathematical description of physical and chemical processes. This eliminates the finite-difference, finite-volume, finite-element or other approximations of the governing equations from the computational algorithms. Full article

(This article belongs to the Topic Fluid Mechanics, 2nd Edition)

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