Dear all,

I am simulating 2D-airfoils in a subsonic flow. Relevant for me is the total lift (force in y-direction). The strongly differing results from inviscid calculations compared to k-epsilon calculations (10 to 20% depending on the airfoil and angle of incidence) surprised me. I would expect some increase in pressure due to drag but not this much.

Do any of you have experienced the same and maybe know a percentage figure of the difference that is to be expected? Are there more reasons for this difference?

Thank you in advance for your help

Greetings Stephan

Dear Stephan,

Are you comparing two different turbulence models?

Opaque

Dear Opaque,

thanks for answering. The purpose of my simulations is to find out whether I can use the inviscid (Euler-) solver to get the lift distribution without a major error or how big this error would be. The only turbulence model I used so far to compare the inviscid results to was the k-epsilon (realizable) model.

Greetings Stephan