The adverse flow before the stagnation point of the blunt body

flyingseed · April 1, 2013, 07:24

Hello,
When I using the third-order WENO scheme to simulate the supersonic flow past a blunt cone (or circular cyliner, sphere), there is some adverse flow (the direction of the flow is against that of the incoming flow ) before the stagnation point, could someone tell me the reason and how to solve this problem? I have tried many ways like changing the grids or altering other flux splitting methods, but the problem still exists.

thanks,
flyingseed

meshwarrior · April 3, 2013, 03:15

Is it carbuncle?
www.google.com/search?q=carbuncle+cfd

flyingseed · April 3, 2013, 05:23

thanks for your reply
The pressure and the heating flux on the wall show reasonable agreement with the experiments. And the shock is smooth.
So I think it is not the carbuncle

flyingseed

meshwarrior · April 4, 2013, 04:11

Could you post some pictures (velocity or Ma fields or v(x) along axis of symmetry)?
What is the order of magnitude of reverse flow velocity in relation to velocity behind normal shock?
I think if even heat fluxes show reasonable agreement with the experiments than (weak?) adverse flow is not a thing to worry about.

April 1, 2013, 07:24	The adverse flow before the stagnation point of the blunt body	#1
flyingseed New Member Join Date: Nov 2012 Posts: 13 Rep Power: 13	Hello, When I using the third-order WENO scheme to simulate the supersonic flow past a blunt cone (or circular cyliner, sphere), there is some adverse flow (the direction of the flow is against that of the incoming flow ) before the stagnation point, could someone tell me the reason and how to solve this problem? I have tried many ways like changing the grids or altering other flux splitting methods, but the problem still exists. thanks, flyingseed

April 3, 2013, 05:23	I think it is not the carbuncle phenomenon	#3
flyingseed New Member Join Date: Nov 2012 Posts: 13 Rep Power: 13	thanks for your reply The pressure and the heating flux on the wall show reasonable agreement with the experiments. And the shock is smooth. So I think it is not the carbuncle flyingseed

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April 3, 2013, 03:15		#2
meshwarrior New Member Ton Join Date: Mar 2013 Posts: 9 Rep Power: 13	Is it carbuncle? www.google.com/search?q=carbuncle+cfd

April 4, 2013, 04:11		#4
meshwarrior New Member Ton Join Date: Mar 2013 Posts: 9 Rep Power: 13	Could you post some pictures (velocity or Ma fields or v(x) along axis of symmetry)? What is the order of magnitude of reverse flow velocity in relation to velocity behind normal shock? I think if even heat fluxes show reasonable agreement with the experiments than (weak?) adverse flow is not a thing to worry about.