Construction of accurate, robust and simple riemann solvers

Meiu Son, K. Takayama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new method is proposed to split the flux vector of the Euler equations by introducing two artificial wave speeds. The flux vector is split to two simple ones. One flux vector comes with unidirectional eigenvalues, so that it can be easily solved by one-side differencing. Another flux vector becomes a system of two waves and one, two or three stationary discontinuities depending on the dimension of the Euler equations. Numerical flux function for multi-dimensional Euler equations is formulated for any grid system, structured or unstructured. A remarkable simplicity of the scheme is that it successfully achieves one-sided approximation for all waves without recourse to any matrix operation. Moreover, its accuracy is comparable with the exact Riemann solver. For 1-D Euler equations, the scheme actually surpasses the exact solver in avoiding expansion shocks without any additional entropy fix. The scheme can exactly resolve stationary 1-D contact discontinuities, and it avoids the carbuncle problem in multi-dimensional computations. It is shear diffusion terms that suppress the carbuncle problem. It is found that the shear diffusion terms can be used to suppress the carbuncle problem produced by other upwind schemes as well, such as the Godunov and the HLLC Riemann solvers. Side effect of the shear dissipation in the computation of the boundary layer can be controlled within a low level if the limiting procedure for a high-order scheme is not imposed on tangential velocity.

Original languageEnglish
Title of host publication16th AIAA Computational Fluid Dynamics Conference
Publication statusPublished - 2003 Dec 1
Event16th AIAA Computational Fluid Dynamics Conference 2003 - Orlando, FL, United States
Duration: 2003 Jun 232003 Jun 26

Publication series

Name16th AIAA Computational Fluid Dynamics Conference

Other

Other16th AIAA Computational Fluid Dynamics Conference 2003
CountryUnited States
CityOrlando, FL
Period03/6/2303/6/26

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology
  • Engineering (miscellaneous)
  • Aerospace Engineering
  • Automotive Engineering
  • Mechanical Engineering

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