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Further Study on Errors in Metric Evaluation by Linear Upwind Schemes with Flux Splitting in Stationary Grids

Part of: Partial differential equations, initial value and time-dependent initial-boundary value problems

Published online by Cambridge University Press:  03 May 2017

Qin Li ,
Dong Sun  and
Pengxin Liu
Qin Li*
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang, Sichuan, 621000, P.R. China National Laboratory of Computational Fluid Dynamics, Beijing University of Aeronautics and Astronautics, Beijing 100191, P.R. China
Dong Sun*
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang, Sichuan, 621000, P.R. China
Pengxin Liu*
Affiliation:
State Key Laboratory of Aerodynamics, Mianyang, Sichuan, 621000, P.R. China
*
*Corresponding author. Email addresses:qin-li@vip.tom.com (Q. Li), sund1986@foxmail.com (D. Sun), liupengxin2008@163.com (P. Liu)
*Corresponding author. Email addresses:qin-li@vip.tom.com (Q. Li), sund1986@foxmail.com (D. Sun), liupengxin2008@163.com (P. Liu)
*Corresponding author. Email addresses:qin-li@vip.tom.com (Q. Li), sund1986@foxmail.com (D. Sun), liupengxin2008@163.com (P. Liu)
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Abstract

The importance of eliminating errors in grid-metric evaluation for high-order difference schemes has been widely recognized in recent years, and it is known from the proof by Vinokur and Yee (NASA TM 209598, 2000) that when conservative derivations of grid metric are used by Thomas, Lombard and Neier (AIAA J., 1978, 17(10) and J. Spacecraft and rocket, 1990, 27(2)), errors caused by metric evaluation could be eliminated by linear schemes when flux splitting is not considered. According to the above achievement, central schemes without the use of flux splitting could fulfill the requirement of error elimination. Difficulties will arise for upwind schemes to attain the objective when the splitting is considered. In this study, further investigations are made on three aspects: Firstly, an idea of central scheme decomposition is introduced, and the procedure to derive the central scheme is proposed to evaluate grid metrics only. Secondly, the analysis has been made on the requirement of flux splitting to acquire free-stream preservation, and a Lax-Friedrichs-type splitting scheme is proposed as an example. Discussions about current study with that by Nonomura et al. (Computers and Fluids, 2015, 107) have been made. Thirdly, for half-node- or mixed-type schemes, interpolations should be used to derive variables at half nodes. The requirement to achieve metric identity on this situation is analyzed and an idea of directionally consistent interpolation is proposed, which is manifested to be indispensable to avoid violations of metric identity and to eliminate metric-caused errors thereafter. Two numerical problems are tested, i.e., the free-stream and vortex preservation on wavy, largely randomized and triangular-like grids. Numerical results validate aforementioned theoretical outcomes.

Keywords

Upwind schemeflux splittingmetric identityfree-stream preservation

MSC classification

Secondary: 65M06: Finite difference methods
Type
Research Article
Information
Communications in Computational Physics , Volume 22 , Issue 1 , July 2017 , pp. 64 - 94
Copyright
Copyright © Global-Science Press 2017 

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Footnotes

Communicated by Kun Xu

References

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