high pressure simulation

mahi

Hi,

I am doing a flow simulation inside an engine. The domain is the space between the piston and the cylinder. It is a 2 phase flow with air and oil, with a time varying pressure and temperature at the inlet and ambient conditions at the outlet, with one outer wall moving(sinusoidal profile). The pressure can be as high as 50 bar at some point in time. The mesh has been completed and the simulation is running fine with simple flow conditions. Do I have to make any changes to the supersonic pressure condition at the inlet when I test with high pressure? Right now I am getting floating point error at high inlet pressure.