Discussion Forum

Hi I am trying to use PDE General module in COMSOL 4.2 to simulate Euler equations. I know that we have a Laminar Flow module than I can put viscosity equal to zero to have Euler equations but I would like to solve it in PDE forms.

I have a question regarding defining different variables. So this is the case if I want to solve PDE general module using conservative forms of Euler equation I will have
U=[rho, rho*u,rho*v]
gamma=[rho*u rho*v
rho*u^2+p rho*u*v
rho*u*v rho*v^2+p]

as you can see I have a pressure term that I am not sure what should I do with it since I cannot express it as my conservative variables unless I define another set of equations for energy to solve Temperature and connect "rho", "T" to "P". Even in this case I need to have a relationship like the one that we have for ideal gas to solve this. Does anyone have any suggestions for my problem?

Bottom line how should I define my variables to solve something like Euler equation or to some extent Navier-Stokes equations with the General PDE module of COMSOL?

Cheers