Aero/Hydrodynamics and Symmetry 2020

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Mathematics".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 13803

Special Issue Editor

Special Issue Information

Dear Colleagues,

The existence of symmetry and its breaking in aero-/hydro-dynamics applications is one of the most important aspects of many engineering fields (e.g., mechanical, aerospace, chemical, and process engineering). For instance, the existence of symmetry breaking at a critical Reynolds number can confirm the existence of a bifurcation in expansion pipe flows. Such a symmetry breaking mechanism may cause the appearance of turbulence, which in return increases the mixing and required pumping power for several process engineering design applications. In aerospace applications, the receptivity of a symmetric laminar flow to internal/external perturbations may cause the flow to transition, a dramatic change in the local drag coefficient, and heat removal from the surface. The latter needs to be considered in the design step for choosing the proper materials that can also bear the unbalanced thermodynamic loads.

The applications of symmetry and its breaking are usually inter-disciplinary, and prior knowledge of them is crucial for many real-life applications. Therefore, the current Special Issue, Aero-/Hydro-dynamics and Symmetry, invites original and review works in the field for participation. The scope of this Special Issue includes, but is not limited to, the state-of-the-art computational, theoretical, and experimental works dealing with symmetry and its breaking, in line with aero-/hydro-dynamics applications. Recent advances in numerical, theoretical, and experimental methodologies, as well as finding new physics, new methodological developments, and their limitations, lie within the scope of the current Special Issue. Potential topics dealing with topics including but not limited to the following are deemed suitable for publication:

 

  • Mathematical models such as the symmetry method, homotopy perturbation method (HPM), homotopy analysis method (HAM), lie group, integral transform, and so on;
  • Equilibrium and out-of-equilibrium thermodynamics and fluid mechanics;
  • Hydrodynamics for symmetric exclusion;
  • Hydrodynamics with multiple higher-form symmetries;
  • Ideal order and dissipative fluids with q-form symmetry;
  • Partial and fractional order differential equations;
  • Finite difference (FDM), finite volume (FVM), finite element (FEM), smoothed particle hydrodynamics (SPH), moving particle semi-implicit (MPS), lattice Boltzmann (LBM) methods, and so on;
  • Multiphysics phenomena such as non-Newtonian flows, multiphase flows, phase changes, nanofluidics, magnetohydrodynamics (MHD), electrohydrodynamics (EHD), and so on;
  • Symmetry and its breakdown in transitional and turbulent flows.

Prof. Dr. Mostafa Safdari Shadloo

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. Symmetry 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.

Published Papers (4 papers)

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Research

12 pages, 2897 KiB  
Article
Impacts of Viscous Dissipation and Brownian motion on Jeffrey Nanofluid Flow over an Unsteady Stretching Surface with Thermophoresis
by Essam R. El-Zahar, Ahmed M. Rashad and Laila F. Seddek
Symmetry 2020, 12(9), 1450; https://doi.org/10.3390/sym12091450 - 03 Sep 2020
Cited by 27 | Viewed by 1993
Abstract
The goal of this investigation is to explore the influence of viscous dissipation and Brownian motion on Jeffrey nanofluid flow over an unsteady moving surface with thermophoresis and mixed convection. Zero mass flux is also addressed at the surface such that the nanoparticles [...] Read more.
The goal of this investigation is to explore the influence of viscous dissipation and Brownian motion on Jeffrey nanofluid flow over an unsteady moving surface with thermophoresis and mixed convection. Zero mass flux is also addressed at the surface such that the nanoparticles fraction of maintains itself on huge obstruction. An aiding transformation is adopted to renovate the governing equations into a set of partial differential equations which is solved using a new fourth-order finite difference continuation method and various graphical outcomes are discussed in detail with several employed parameters. The spectacular influence of pertinent constraints on velocity and thermal curves are inspected through various plots. Computational data for the heat transfer rate and skin-friction coefficient are also reported graphically. Graphical outcomes indicate that an augmentation in buoyance ratio and thermophoretic parameter leads to diminish the velocity curves and increase the temperature curves. Furthermore, it is inspected that escalating Deborah number exhibits increasing in the skin friction and salient decreasing heat transmission. Increasing magnetic strength leads to a reduction in the skin friction and enhancement in the Nusselt number, whilst a reverse reaction is manifested with mixed convection aspects. Full article
(This article belongs to the Special Issue Aero/Hydrodynamics and Symmetry 2020)
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30 pages, 32046 KiB  
Article
A Parametric Study of Trailing Edge Flap Implementation on Three Different Airfoils Through an Artificial Neuronal Network
by Igor Rodriguez-Eguia, Iñigo Errasti, Unai Fernandez-Gamiz, Jesús María Blanco, Ekaitz Zulueta and Aitor Saenz-Aguirre
Symmetry 2020, 12(5), 828; https://doi.org/10.3390/sym12050828 - 18 May 2020
Cited by 11 | Viewed by 4067
Abstract
Trailing edge flaps (TEFs) are high-lift devices that generate changes in the lift and drag coefficients of an airfoil. A large number of 2D simulations are performed in this study, in order to measure these changes in aerodynamic coefficients and to analyze them [...] Read more.
Trailing edge flaps (TEFs) are high-lift devices that generate changes in the lift and drag coefficients of an airfoil. A large number of 2D simulations are performed in this study, in order to measure these changes in aerodynamic coefficients and to analyze them for a given Reynolds number. Three different airfoils, namely NACA 0012, NACA 64(3)-618, and S810, are studied in relation to three combinations of the following parameters: angle of attack, flap angle (deflection), and flaplength. Results are in concordance with the aerodynamic results expected when studying a TEF on an airfoil, showing the effect exerted by the three parameters on both aerodynamic coefficients lift and drag. Depending on whether the airfoil flap is deployed on either the pressure zone or the suction zone, the lift-to-drag ratio, CL/CD, will increase or decrease, respectively. Besides, the use of a larger flap length will increase the higher values and decrease the lower values of the CL/CD ratio. In addition, an artificial neural network (ANN) based prediction model for aerodynamic forces was built through the results obtained from the research. Full article
(This article belongs to the Special Issue Aero/Hydrodynamics and Symmetry 2020)
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13 pages, 1569 KiB  
Article
Similarities of Flow and Heat Transfer around a Circular Cylinder
by Hao Ma and Zhipeng Duan
Symmetry 2020, 12(4), 658; https://doi.org/10.3390/sym12040658 - 22 Apr 2020
Cited by 9 | Viewed by 4114
Abstract
Modeling fluid flows is a general procedure to handle engineering problems. Here we present a systematic study of the flow and heat transfer around a circular cylinder by introducing a new representative appropriate drag coefficient concept. We demonstrate that the new modified drag [...] Read more.
Modeling fluid flows is a general procedure to handle engineering problems. Here we present a systematic study of the flow and heat transfer around a circular cylinder by introducing a new representative appropriate drag coefficient concept. We demonstrate that the new modified drag coefficient may be a preferable dimensionless parameter to describe more appropriately the fluid flow physical behavior. A break in symmetry in the global structure of the entire flow field increases the difficulty of predicting heat and mass transfer behavior. A general simple drag model with high accuracy is further developed over the entire range of Reynolds numbers met in practice. In addition, we observe that there may exist an inherent relation between the drag and heat and mass transfer. A simple analogy model is established to predict heat transfer behavior from the cylinder drag data. This finding provides great insight into the underlying physical mechanism. Full article
(This article belongs to the Special Issue Aero/Hydrodynamics and Symmetry 2020)
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18 pages, 2895 KiB  
Article
The Effect of Nanoparticle Shape and Microchannel Geometry on Fluid Flow and Heat Transfer in a Porous Microchannel
by Zahra Abdelmalek, Annunziata D’Orazio and Arash Karimipour
Symmetry 2020, 12(4), 591; https://doi.org/10.3390/sym12040591 - 08 Apr 2020
Cited by 12 | Viewed by 3060
Abstract
Microchannels are widely used in electrical and medical industries to improve the heat transfer of the cooling devices. In this paper, the fluid flow and heat transfer of water–Al2O3 nanofluids (NF) were numerically investigated considering the nanoparticle shape and different [...] Read more.
Microchannels are widely used in electrical and medical industries to improve the heat transfer of the cooling devices. In this paper, the fluid flow and heat transfer of water–Al2O3 nanofluids (NF) were numerically investigated considering the nanoparticle shape and different cross-sections of a porous microchannel. Spherical, cubic, and cylindrical shapes of the nanoparticle as well as circular, square, and triangular cross-sections of the microchannel were considered in the simulation. The finite volume method and the SIMPLE algorithm have been employed to solve the conservation equations numerically, and the k-ε turbulence model has been used to simulate the turbulence fluid flow. The models were simulated at Reynolds number ranging from 3000 to 9000, the nanoparticle volume fraction ranging from 1 to 3, and a porosity coefficient of 0.7. The results indicate that the average Nusselt number (Nuave) increases and the friction coefficient decreases with an increment in the Re for all cases. In addition, the rate of heat transfer in microchannels with triangular and circular cross-sections is reduced with growing Re values and concentration. The spherical nanoparticle leads to maximum heat transfer in the circular and triangular cross-sections. The heat transfer growth for these two cases are about 102.5% and 162.7%, respectively, which were obtained at a Reynolds number and concentration of 9000 and 3%, respectively. However, in the square cross-section, the maximum heat transfer increment was obtained using cylindrical nanoparticles, and it is equal to 80.2%. Full article
(This article belongs to the Special Issue Aero/Hydrodynamics and Symmetry 2020)
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