Patent ID: 7516054

Claim:
A computer implemented method for numerical calculation to analyze a fluid, comprising: a setting step of setting conserved quantities for the fluid at time points n−1 and n; a dividing step of dividing a flux of the fluid into a plurality of parts including an advection part and a pressure-dependent part, to calculate a conservative equation; a first calculation step of calculating a value of the advection part at the time point n−1 using an upwind difference type leap-frog difference method based on flow velocity; a second calculation step of calculating a value of the pressure-dependent part at the time point n using a central difference type leap-frog difference method; a third calculation step of calculating the conserved quantity at time point n+1 based on the values of the advection part at the time point n−1 calculated using the upwind difference type leap-frog difference method and the pressure-dependent part at the time point n calculated using the central difference type leap-frog difference method; and a display step of displaying a graph representing the result of the calculation in at least one of said first, second, and third calculation steps.