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Published in: Acta Mechanica Sinica 2/2019

22-02-2019 | Research Paper

Numerical solutions of 2-D steady compressible natural convection using high-order flux reconstruction

Authors: Yaojie Yu, Feng Liu, Tingbo Zhou, Chao Gao, Ya Liu

Published in: Acta Mechanica Sinica | Issue 2/2019

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Abstract

Low Mach number flows are common and typical in industrial applications. When simulating these flows, performance of traditional compressible flow solvers can deteriorate in terms of both efficiency and accuracy. In this paper, a new high-order numerical method for two-dimensional (2-D) state low Mach number flows is proposed by combining flux reconstruction (FR) and preconditioning. Firstly, a Couette flow problem is used to assess the efficiency and accuracy of preconditioned FR. It is found that the FR scheme with preconditioning is much more efficient than the original FR scheme. Meanwhile, this improvement still preserves the numerical accuracy. Using this new method and without the Boussinesq assumption, classic natural convection is directly simulated for cases of small and large temperature differences. For the small temperature difference, a p and h refinement study is conducted to verify the grid convergence and accuracy. Then, the influence of the Rayleigh number (Ra) is analyzed. By comparing with the reference results, the numerical results of preconditioned FR is very close to that calculated by incompressible solvers. Furthermore, a large temperature difference test case is calculated and analyzed, indicating this method is not limited by the Boussinesq assumption and is also applicable to heat convection with large temperature differences.

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Literature
27.
go back to reference Bassi, F., Rebay, S.: A high-order discontinuous Galerkin method forcompressible turbulent flows. In: Cockburn, G.K.B., Shu, C.-W. (eds.) Discontinuous Galerkin Methods: Theory, Computation, and Application. Lecture Notes in Computational Science and Engineering, pp. 77–88. Springer, Berlin (2000)CrossRef Bassi, F., Rebay, S.: A high-order discontinuous Galerkin method forcompressible turbulent flows. In: Cockburn, G.K.B., Shu, C.-W. (eds.) Discontinuous Galerkin Methods: Theory, Computation, and Application. Lecture Notes in Computational Science and Engineering, pp. 77–88. Springer, Berlin (2000)CrossRef
Metadata
Title
Numerical solutions of 2-D steady compressible natural convection using high-order flux reconstruction
Authors
Yaojie Yu
Feng Liu
Tingbo Zhou
Chao Gao
Ya Liu
Publication date
22-02-2019
Publisher
The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences
Published in
Acta Mechanica Sinica / Issue 2/2019
Print ISSN: 0567-7718
Electronic ISSN: 1614-3116
DOI
https://doi.org/10.1007/s10409-018-00835-w

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