Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS

Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS

The applicability of the solution of the unsteady Reynolds-averaged Navier–Stokes equations (URANS) for the numerical simulation of the periodic quasi-switching regime of vortex generation and heat transfer in a deep conical dimple with a slope angle of <inline-formula><math xmlns="htt...

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Autores principales: Sergey Isaev, Dmitry Nikushchenko, Alexandr Sudakov, Nikita Tryaskin, Ann Egorova, Leonid Iunakov, Alexandr Usachov, Valery Kharchenko
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
jet-vortex generation
heat transfer
conical dimple
channel
simulation
URANS
Thermodynamics
QC310.15-319
Descriptive and experimental mechanics
QC120-168.85
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spelling oai:doaj.org-article:b4057a41ed18419f8abf8a7e82db9cb82021-11-25T17:31:31ZNumerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS10.3390/fluids61103852311-5521https://doaj.org/article/b4057a41ed18419f8abf8a7e82db9cb82021-10-01T00:00:00Zhttps://www.mdpi.com/2311-5521/6/11/385https://doaj.org/toc/2311-5521The applicability of the solution of the unsteady Reynolds-averaged Navier–Stokes equations (URANS) for the numerical simulation of the periodic quasi-switching regime of vortex generation and heat transfer in a deep conical dimple with a slope angle of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mo>∘</mo></msup></semantics></math></inline-formula> on the wall of a narrow channel is substantiated. To calculate the turbulent regime, the model of shear stress transfer by Menter 2003, modified taking into account the influence of the curvature of streamlines within the framework of the Rodi-Leshziner-Isaev approach, is used. At Reynolds number <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><mi>e</mi><mo>=</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula>, the oscillation period of the transverse <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>z</mi></msub></semantics></math></inline-formula> and longitudinal forces <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>x</mi></msub></semantics></math></inline-formula>, as well as the total heat transfer <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>N</mi><msub><mi>u</mi><mrow><mi>m</mi><mi>m</mi></mrow></msub></mrow></semantics></math></inline-formula> to the control section of the heated channel wall with a dimple, is set equal to 60, which corresponds to the Strouhal number <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>S</mi><mi>t</mi><mo>=</mo><mn>0.0167</mn></mrow></semantics></math></inline-formula>. Computer visualization of swirling jet-vortex flows demonstrates focus-type sources on the side faces of the dimple. In the self-oscillating mode, a two-cell vortex system is formed with different intensities at the oscillation period <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>z</mi></msub></semantics></math></inline-formula>. Periodic changes in friction, Nusselt numbers and temperature are recorded in the longitudinal and transverse median sections of the dimple and reflect the oscillations of the vortex structure from left to right and from right to left. The formation of a fan jet is shown, which oscillates relative to the plane of longitudinal symmetry, causing a redistribution of power and thermal loads.Sergey IsaevDmitry NikushchenkoAlexandr SudakovNikita TryaskinAnn EgorovaLeonid IunakovAlexandr UsachovValery KharchenkoMDPI AGarticlejet-vortex generationheat transferconical dimplechannelsimulationURANSThermodynamicsQC310.15-319Descriptive and experimental mechanicsQC120-168.85ENFluids, Vol 6, Iss 385, p 385 (2021)
institution DOAJ
collection DOAJ
language EN
topic jet-vortex generation
heat transfer
conical dimple
channel
simulation
URANS
Thermodynamics
QC310.15-319
Descriptive and experimental mechanics
QC120-168.85
spellingShingle jet-vortex generation
heat transfer
conical dimple
channel
simulation
URANS
Thermodynamics
QC310.15-319
Descriptive and experimental mechanics
QC120-168.85
Sergey Isaev
Dmitry Nikushchenko
Alexandr Sudakov
Nikita Tryaskin
Ann Egorova
Leonid Iunakov
Alexandr Usachov
Valery Kharchenko
Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
description The applicability of the solution of the unsteady Reynolds-averaged Navier–Stokes equations (URANS) for the numerical simulation of the periodic quasi-switching regime of vortex generation and heat transfer in a deep conical dimple with a slope angle of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mo>∘</mo></msup></semantics></math></inline-formula> on the wall of a narrow channel is substantiated. To calculate the turbulent regime, the model of shear stress transfer by Menter 2003, modified taking into account the influence of the curvature of streamlines within the framework of the Rodi-Leshziner-Isaev approach, is used. At Reynolds number <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>R</mi><mi>e</mi><mo>=</mo><msup><mn>10</mn><mn>4</mn></msup></mrow></semantics></math></inline-formula>, the oscillation period of the transverse <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>z</mi></msub></semantics></math></inline-formula> and longitudinal forces <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>x</mi></msub></semantics></math></inline-formula>, as well as the total heat transfer <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>N</mi><msub><mi>u</mi><mrow><mi>m</mi><mi>m</mi></mrow></msub></mrow></semantics></math></inline-formula> to the control section of the heated channel wall with a dimple, is set equal to 60, which corresponds to the Strouhal number <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>S</mi><mi>t</mi><mo>=</mo><mn>0.0167</mn></mrow></semantics></math></inline-formula>. Computer visualization of swirling jet-vortex flows demonstrates focus-type sources on the side faces of the dimple. In the self-oscillating mode, a two-cell vortex system is formed with different intensities at the oscillation period <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>z</mi></msub></semantics></math></inline-formula>. Periodic changes in friction, Nusselt numbers and temperature are recorded in the longitudinal and transverse median sections of the dimple and reflect the oscillations of the vortex structure from left to right and from right to left. The formation of a fan jet is shown, which oscillates relative to the plane of longitudinal symmetry, causing a redistribution of power and thermal loads.
format article
author Sergey Isaev
Dmitry Nikushchenko
Alexandr Sudakov
Nikita Tryaskin
Ann Egorova
Leonid Iunakov
Alexandr Usachov
Valery Kharchenko
author_facet Sergey Isaev
Dmitry Nikushchenko
Alexandr Sudakov
Nikita Tryaskin
Ann Egorova
Leonid Iunakov
Alexandr Usachov
Valery Kharchenko
author_sort Sergey Isaev
title Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
title_short Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
title_full Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
title_fullStr Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
title_full_unstemmed Numerical Simulation of a Periodic Quasi-Switching Mode of Flow around a Conical Dimple with a Slope Angle of 10 Degrees on the Wall of a Narrow Channel Using URANS
title_sort numerical simulation of a periodic quasi-switching mode of flow around a conical dimple with a slope angle of 10 degrees on the wall of a narrow channel using urans
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/b4057a41ed18419f8abf8a7e82db9cb8
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