Patent ID: 7337077

Claim:
A calculator, for calculating a displacement of a fluid, for use in united calculation of compressible fluid, incompressible fluid and elastic structural body, said calculator comprising: means for calculating the displacement with the fluid regarded as an elastic structural body for a given period of time based on a hypothesis that fluid is such a substance that it causes transition from a state (1) at time t 1 to a state (2) at time t 2 through motion state that can be considered as an elastic body for a short period of time, and after the transition, a memory of elastic deformation is lost to leave only quantity of state, and means for storing the calculated displacement for subsequent use, wherein in a complex system composed of a compressible fluid, an incompressible fluid and an elastic structural body, said means for calculating treat pressures of the compressible fluid and the incompressible fluid at each time unitedly defined as a function of state quantities of density and temperature at each time, and treat a viscous stress tensor defined as a stress concerning motion for a short period of time similarly to elastic body, and wherein said means for calculating unitedly solves Lagrangian movement of physical quantities of fluid and elastic body by directly calculating a displacement up to a next time and employing the displacement.