Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method

In this article, a numerical investigation is carried out for analyzing the thermal non-equilibrium effects of diatomic and polyatomic gases on the flow dynamics of a shock-accelerated square light bubble. The simulation emphasis is placed on the flow morphology visualization, wave patterns, degree...

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Main Author: Singh, Satyvir
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/156106
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1561062022-04-22T01:00:58Z Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method Singh, Satyvir School of Physical and Mathematical Sciences Engineering::Mechanical engineering::Fluid mechanics Shock Waves Square Bubble In this article, a numerical investigation is carried out for analyzing the thermal non-equilibrium effects of diatomic and polyatomic gases on the flow dynamics of a shock-accelerated square light bubble. The simulation emphasis is placed on the flow morphology visualization, wave patterns, degree of thermal non-equilibrium, vorticity generation, and evolution of enstrophy as well as dissipation rate. A two-dimensional system of unsteady physical conservation laws derived from the Boltzmann-Curtiss kinetic equation of diatomic and polyatomic gases is solved by employing an in-house developed mixed-type modal discontinuous Galerkin method with uniform meshes. An explicit third-order SSP Runge-Kutta scheme is employed for the time discretization. The numerical results are compared with existing experimental results for validation, and they are found in good agreement. The results elucidate that the effects of thermal non-equilibrium, including different gas properties play a significant role during the interaction between an incident shock wave and a square light bubble. The effects of diatomic and polyatomic gases cause a significant change in flow morphology, resulting in complex wave patterns, vorticity generation, vortices formation, and bubble deformation. In comparison to monatomic gases, diatomic and polyatomic gases exhibit the formation of larger rolled-up vortex chains, different jet structure and large mixing zones. A detailed investigation on the effects of diatomic and polyatomic gases is explored using the vorticity generation, degree of non-equilibrium, the evolutions of enstrophy and dissipation rate. Finally, the effects of thermal non-equilibrium parameters, including temperature-dependent transport coefficient and bulk viscosity ratio, on the flow dynamics of the shock-accelerated square light bubble are comprehensively investigated. Nanyang Technological University Submitted/Accepted version The author would like to acknowledge the financial support from the NAP-SUG grant program funded by the Nanyang Technological University, Singapore. 2022-04-22T01:00:58Z 2022-04-22T01:00:58Z 2021 Journal Article Singh, S. (2021). Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method. International Journal of Heat and Mass Transfer, 179, 121708-. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121708 0017-9310 https://hdl.handle.net/10356/156106 10.1016/j.ijheatmasstransfer.2021.121708 2-s2.0-85110378827 179 121708 en NAP-SUG-M408074 International Journal of Heat and Mass Transfer © 2021 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering::Fluid mechanics
Shock Waves
Square Bubble
spellingShingle Engineering::Mechanical engineering::Fluid mechanics
Shock Waves
Square Bubble
Singh, Satyvir
Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
description In this article, a numerical investigation is carried out for analyzing the thermal non-equilibrium effects of diatomic and polyatomic gases on the flow dynamics of a shock-accelerated square light bubble. The simulation emphasis is placed on the flow morphology visualization, wave patterns, degree of thermal non-equilibrium, vorticity generation, and evolution of enstrophy as well as dissipation rate. A two-dimensional system of unsteady physical conservation laws derived from the Boltzmann-Curtiss kinetic equation of diatomic and polyatomic gases is solved by employing an in-house developed mixed-type modal discontinuous Galerkin method with uniform meshes. An explicit third-order SSP Runge-Kutta scheme is employed for the time discretization. The numerical results are compared with existing experimental results for validation, and they are found in good agreement. The results elucidate that the effects of thermal non-equilibrium, including different gas properties play a significant role during the interaction between an incident shock wave and a square light bubble. The effects of diatomic and polyatomic gases cause a significant change in flow morphology, resulting in complex wave patterns, vorticity generation, vortices formation, and bubble deformation. In comparison to monatomic gases, diatomic and polyatomic gases exhibit the formation of larger rolled-up vortex chains, different jet structure and large mixing zones. A detailed investigation on the effects of diatomic and polyatomic gases is explored using the vorticity generation, degree of non-equilibrium, the evolutions of enstrophy and dissipation rate. Finally, the effects of thermal non-equilibrium parameters, including temperature-dependent transport coefficient and bulk viscosity ratio, on the flow dynamics of the shock-accelerated square light bubble are comprehensively investigated.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Singh, Satyvir
format Article
author Singh, Satyvir
author_sort Singh, Satyvir
title Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
title_short Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
title_full Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
title_fullStr Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
title_full_unstemmed Numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous Galerkin method
title_sort numerical investigation of thermal non-equilibrium effects of diatomic and polyatomic gases on the shock-accelerated square light bubble using a mixed-type modal discontinuous galerkin method
publishDate 2022
url https://hdl.handle.net/10356/156106
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