Two-phase flow in porous media simulation with Fluent Case description The water and air flow in the porous media in this case. There are only air in the porous media and water in the cavity at the beginning. The flow area is shown below. In the picture, the upper part is a cavity and the lower is a porous media. The water holds two-thirds of the volume in cavity at the beginning. The inlet keeps a pressure of 0 pa. The pressure of outlet increases with time as a function of . The relationship of and time t is shown below. The multiphase model of this case is Level Set. The surface tension of two phase is none. The porosity of porous media is 0.4. Both of the water and air viscous resistance are 2.111E8. The solution method is SIMPLE and all parameters are default. The content of UDF file about is listed below. The file is interpreted in the Fluent. x 1 #include "udf.h" 2 3 DEFINE_PROFILE ( pressure_inlet_t