EQUATION SOLUTION ON DIFFUSION, EQUATION SOLUTION ON VISCOUS FLOW AND RECORDING MEDIUM WITH THESE SOLUTION PROGRAMS RECORDED THEREON

摘要

PROBLEM TO BE SOLVED: To obtain equation solution on diffusion which can be executed in a short calculation time as a whole and easily develops a program by reconsidering (v), etc., in the next point from quantity (v) depending on the time and space in a prescribed point to repeat it and calculating solution cumulatively in a specified equation. ;SOLUTION: When the value of the expression of dv/dt=A (v,...) in a discrete representative point can be represented approximately as (Veven)-v.D/S by using quantity (v) depending on time and space in the representative point, Veven calculated from the (v) of the representative point of an adjacent periphery, a diffusion coefficient D and a constant S, the situation Vnext of the point i+1 is calculated on the basis of the situation (v) of a point (i). In this step, a procedure that calculates approximation solution obtained by using (a) being quantity obtained by making a variable (v) level along time is applied to all of the points on analysis. Then, the whole operations that calculate a set of vnext and a set of anext from a set of (v) and a set of (a) are repeated by reconsidering vnext and anext as (v) and (a) and solution is cumulatively obtained.;COPYRIGHT: (C)2000,JPO