Pressure Dependency of Density | Equation of State
 

Hello Community,


actually this might also be a quite general question, I try to get an answer here as I try to model my system with Star-CCM.


I want to compare and validate my FDM C++ Code with a simulation of Star-CCM. In my Code I use an Equation of State for the pressure dependency of the density, from which I can calculate the pressure. In that equation I find the compressibility k.


To compare the results I need a fluid with the same properties in Star. But I can't find the property compressibilty. Also if I look at the density property of Air it says constant.



To validate my Code with the Simulation, am I somehow able to express the Equation of State in a kind of Field Function or is there another way to couple my density with an Equation of State in order to have a fluid that matches my properties?


Kind Regards

There are various options for EOS of air, including incompressible (constant density) and ideal gas. If those don't satisfy your need, you can always define a user EOS and a custom fluid. I suggest reading the help material, it will tell you everything you need to know.