Improvement on Block LU-SGS Scheme for Unstructured Mesh

비정렬 격자계에서 Block LU-SGS 기법의 개선에 관한 연구

  • 김주성 (한국과학기술원 기계공학과 대학원 항공우주공학전공) ;
  • 권오준 (한국과학기술원 기계공학과 항공우주공학전공)
  • Published : 2001.05.01

Abstract

An efficient Gauss-Seidel time integration scheme is developed for solving the Euler and Navier-Stokes equations on unstructured meshes. Roe's FDS is used for the explicit residual computations and van Leer's FVS for evaluating implicit flux Jacobian. To reduce the memory requirement to a minimum level, off-diagonal flux Jacobian contributions are repeatedly calculated during the Gauss-Seidel sub-iteration process. Computational results based on the present scheme show that approximately $15\%$ of CPU time reduction is achieved while maintaining the memory requirement level to $50-60\%$ of the original Gauss-Seidel scheme.

Keywords