Abstract
A numerical method for simulating supercritical fluids of arbitrary substance is presented. The preconditioning method developed by the authors is coupled with the PROPATH, which is a database for thermo-physical properties developed by Kyushu University. The present method enables us to calculate an arbitrary substance at arbitrary pressure and temperature conditions, such as CO_2, H_2O, N_2, and CH_4 programmed in the PROPATH, accurately. Therefore, the present method can apply to simulate a number of practical problems for supercritical fluids especially in near-critical conditions. As numerical examples, Rayleigh-Benard convections assuming a near-critical fluid of CO_2, H_2O, and N_2 are calculated and the calculated results are compared with each other and the calculated results assuming an ideal gas.
