Supersonic flow

bhargavkalathiya · February 11, 2018, 06:13

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.

velocity as monitor point.jpg

rsidual.jpg

velocity.jpg

mach number.jpg

Gert-Jan · February 11, 2018, 19:30

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.

February 11, 2018, 06:13	Supersonic flow	#1
bhargavkalathiya New Member bhargav Join Date: Feb 2018 Posts: 1 Rep Power: 0	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. velocity as monitor point.jpg rsidual.jpg velocity.jpg mach number.jpg

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February 11, 2018, 19:30		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,903 Rep Power: 28	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.