UNSTEADY FLOW ANALYSES BY MEANS OF OPTIMUM GRID METHOD
Hiroyoshi Shi-igai, Toshiyuki MIYAKE, Yasuo HIGASHI · Doboku Gakkai Ronbunshu · 1986
Stability problems, including oscillation or even divergence of the solution, have been always involved in case of the unsteady flow computation as far as explicit method is employed.The Optimum Grid Method (OGM) proposed in this paper eliminates stability problems with minimum computation time, keeping the solution points in domains of determination, since the computer can choose optimum time intervals automatically. OGM makes it also possible to evaluate computational error scales.OGM is an extended form of the characteristics method with a fixed time interval being intensively utilized and developed by Iwasa and his group. It should be noted that OGM is solely designed for PAX type parallel processors, though this may be employed by any existing computers.