It is used with the fluid simulation which analyzes the fluid phenomenon which possesses the configuration manner of the portable boundary which moves

摘要

PROBLEM TO BE SOLVED: To provide a moving boundary setting method preventing storage of errors at the time of re-initialization processing in a level set method.;SOLUTION: A zero level set tracking function f_zero whose purpose is to only track a zero level set indicating a moving boundary is prepared (step 101) and the function f_zero is time-developed for a time interval decided from a condition of stability according to an advection equation (step 102). On the basis of the time-developed zero level set tracking function f_zero, the zero level set indicating the moving boundary is obtained and a level set function f_ls required for setting the moving boundary is constructed on the basis of the obtained zero level set (step 103). On the basis of the constructed level set function f_ls, a density function f_color used for identification of materials present inside and outside the moving boundary is obtained (step 104). Then, the steps 102-104 are repeated until prescribed end time comes (step 105).;COPYRIGHT: (C)2003,JPO