Supersonic flow
 

I am doing CFD of turbomachine operating in supersonic flow in absolute frame. I am using CFx 17.1


Solver : k-w
I have set reference pressure as 0 Bar

Specified inlet conditions
total temperature in stationary frame: 300 K
total Pressure in stationary frame : 101325 pa
And inlet velocity : 500m/s

Outlet : I left it as supersonic (Is it good approach?)

My fluid domain is small so I kept outlet as supersonic. Length of inlet and outlet domain is approx 320 mm.

But I can see that velocity in result file is unbelievable and at inlet is of order of 3000 m/s !!!

I have uploaded velocity contours, mach number contours, monitor of velocity during run at inlet (this velocity is area average over inlet) and residuals.

Please....Can somebody help me What I am doing wrong here?
Thank you so much.


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Step 1: Using Bernouilli-equation, calculate the static pressure on the inlet based on the conditions you provided. Then you'll see what is going wrong.
Step 2: Change it into something realistic.