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[ggege0524]

Hi all, 

 

I simulating  the mixing between two fluids: air and hydrogen, but I have a problem. I want to study how the flow field changes if I change one of the boundary conditions. If I increase the  pressure of the fuel by 40% the results are not good at all. First of all the residuals are very high (continuity >10e-1) and oscillate. Furthermore an increase in the total pressure is noticeable, which is not physically possible. What could be the problem and how can I fix it?

 

Some details about the simulation: -steady, pressure -based solver, 2d, turbulent (SA Model), species model, energy model, pressure inlet BCs ( original version 1.8 and 1.9 bar for fuel and air respectively), same mesh for both simulations, same setup, just changed the pressure for fuel.

Best,