Fluid analyzing apparatus, fluid analyzing method, and fluid analyzing program

摘要

The invention provides a fluid analyzing apparatus, a fluid analyzing method, and a fluid analyzing program which can analyze an unsteady fluid with time developing, which do not depend on nonphysical parameters, and which can perform calculation with good convergence. The apparatus includes: an advection step density analyzing unit which calculates a density in an advection step; an advection step internal energy analyzing unit which calculates an internal energy in the advection step; and an advection step pressure analyzing unit which calculates a pressure developing after advection. The apparatus further includes: an advection step velocity analyzing unit which uses an equation obtained by adding a term of pressure gradient developing before advection to an advection equation of a momentum conservation equation to calculate a velocity in an advection step; a nonadvection step small perturbation analyzing unit which calculates a small perturbation from a pressure developing after advection in a nonadvection step; and a nonadvection step velocity analyzing unit which calculates a velocity developing after a unit time has elapsed. The apparatus further includes: a nonadvection step density analyzing unit which calculates a density developing after a unit time has elapsed; a nonadvection step internal energy analyzing unit which calculates an internal energy developing after the unit time has elapsed; and an iterative calculation control unit which iterates calculations in a predetermined order.