CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   The adverse flow before the stagnation point of the blunt body (http://www.cfd-online.com/Forums/main/115494-adverse-flow-before-stagnation-point-blunt-body.html)

flyingseed April 1, 2013 07:24

The adverse flow before the stagnation point of the blunt body
 
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:D

meshwarrior April 3, 2013 03:15

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

flyingseed April 3, 2013 05:23

I think it is not the carbuncle phenomenon
 
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.


All times are GMT -4. The time now is 15:25.