high pressure gas release

ahourri

Hi everybody: I have a high pressure cylinder (250 bar) releasing methane. Knowing the the dimension of th leak hole and following a model and an equation of state for the gas, I got the data for the masse flow rate, pressure and temperature as a function of time. It choked up to 60 seconds. I did one UDF for the mass low rate/surface of the hole as function of time, ONE udf for the pressure as function of time and one for the temperature as a function of time. When I ran the turbulent compressible model, I get many error messages on pressure and temperature. I ran the incompressible model with the turbulence, everything is correct. The error in AMG solver happens only when I try to use the compressible model. Any suggestion will be appreciated.