가로세로비가 큰 격자에서 국소 예조건화 기법의 정확성 및 수렴성

다국어 초록 (Multilingual Abstract)

The local preconditioning method has both robust convergence and accurate solutions by using local flow properties for parameters in the preconditioning matrix. Preconditioning methods have been very effective to low speed in viscid flows. In the viscous and turbulent flows, deterioration of convergence should be overcame on the high aspect ratio grids to get better convergence and accuracy. In the present study, the local time stepping and min-CFL/max-VNN definitions are applied to compare the results and we propose the method that switches between two methods. The min-CFL definition is applied for in viscid flow problems and the min-CFL/max-VNN definition is implemented to viscous and turbulent flow problems.