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-   -   coverage at Ma=0.8 (http://www.cfd-online.com/Forums/fluent/104862-coverage-ma-0-8-a.html)

M201170944 July 17, 2012 09:54

coverage at Ma=0.8
 
using Fluent to simulate the flow over a missile at Ma=o.8,but still cannot coverage .my Y+ is about 10,is this to small ?Should i
change to over 30 ? And the model is chosen Spalart-Allmaras ,density based:confused::confused::confused:

cfd seeker July 18, 2012 04:54

Quote:

Originally Posted by M201170944 (Post 371906)
using Fluent to simulate the flow over a missile at Ma=o.8,but still cannot coverage .my Y+ is about 10,is this to small ?Should i
change to over 30 ? And the model is chosen Spalart-Allmaras ,density based:confused::confused::confused:

Ma=0.8 is very tricky mach no. and usually problems arises while convergence. Due to local shocks and shock and boundary layer interaction the problem becomes very complex. After running the solution for some iterations refine the mesh in areas where shocks are forming using adaption method. SA is good to start with but I will suggest you to switch over to Realizable K-epsilon or SST k-omega. Density based solver is OK for this problem and switch over to unsteady solver if you are running steady case. Hope it helps

Regards


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