PROBLEM TO BE SOLVED: To solve unsteady advective diffusion equation about problem of hyper Reynolds number and hyper Reyleigh number easily and highly accurately by the finite element method.;SOLUTION: A local strict solution of linearizing advective diffusion matrix is found in advance by using element Green function method, and upper form function is obtained and stored in a storage 2 as a basis function. The advective diffusion matrix is calculated in an advective diffusion matrix calculation means 3. In a simultaneous equations calculation means 4 and a time progression means 5, time integration is processed by explicit time progression method using predictor and modifier method, solution of time progression is found sequentially, and the result is output to an output device 7. The problem of hyper Reynolds number and hyper Reyleigh number can be solved at a high speed with a low storage capacity because constraint of Cell-Reynolds can be entirely eliminated.;COPYRIGHT: (C)2003,JPO
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