CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   Euler computation on hybrid grid (http://www.cfd-online.com/Forums/main/93182-euler-computation-hybrid-grid.html)

naffrancois October 7, 2011 05:51

Euler computation on hybrid grid
 
Hello,

For some strange reasons, I would like to perform an Euler computation of a NACA0012, M=0.8, a=1.25 on a hybrid grid.

Obvisouly, I encounter convergence problems :D, stall or crash.

Does any of you have some tips in order to enforce convergence ?

What I have:
- Time-stepping: Euler-Backward, RGK family
- Spatial scheme: central scalar, central matrix, and some upwind schemes
- Multigrid, Full-multigrid, single grid start-up
- Residual smoothing
- ...

What I tried so far:
- deactivate multigrid
- increase scalar dissipation coeffs
- lowering CFL up to 1 for Euler Backward time-stepping

Not working so far... any help would be highly appreciated !

François


All times are GMT -4. The time now is 07:55.