Compressible Fluid Flow in COMSOL Multiphysics
Hey all,
I am trying to figure out how to do compressible fluid flow with turbulence in COMSOL to determine the lift and drag coefficients for airfoils. I am able to do so for laminar incompressible flow, but of course these are not the correct results. So far, I have used the Chem Engineering  NonIsothermal Flow and Convection and Conduction application modes. The NonIsothermal Flow mode is using the ke Turbulence Model. The nondefault subdomain settings for the NonIsothermal Flow are as follows: a) Dynamic Viscosity is 1.52*10^5 kg/ms b) Initial Pressure is 23842 Pa c) Streamline diffusion off The nondefault boundary settings for the NonIsothermal Flow are as follows: a) An inlet, an outlet, and the rest are set to the default logarithmic function wall. b) Nonlinear weak constraints are on For the Convection and Conduction: a) All sides are set to Thermal Insulator b) Thermal conductivity, density, heat capacity are set to certain values. c) Heat source is set to Q = p_time+u*px+v*py d) Temperature is initiated First off, when I try to solve it it returns with the error "Failed to find a solution: The relative residual (1.3e006) is greater than the relative tolerance. Returned solution has not converged." What does that mean and how can I fix it? And finally, the temperature is constant around the cylinder/airfoil, however the temperature and velocity fields are not. Why is this? Shouldn't the temperature be changing? Thanks for any help you can provide! 
Re: Compressible Fluid Flow in COMSOL Multiphysics
I have the same error message. Did you found out? Does someone can help?

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