RANS cases not converging in SU2 for Delta wing fighter aircraft configuration.

kulls · June 1, 2016, 02:32

Hi Friends,

This problem involves a delta wing fighter aircraft configuration.

Initially i ran some cases(Mach = 0.7 , AoA : 0 to 16 deg., Beta = 0 ) for EULER equations using SU2 code.The convergence achieved was of the order of 5 - 8 order.Results were in close agreement with other solvers..

I tweaked the .cfg file for RANS cases but its not working.
i'm trying to run RANS cases for the same flow condition and same geometry but not able to achieve convergence in any case.

I request everyone to put some useful comments.

Thanks!

mlooti · June 1, 2016, 08:32

Hi

what is your mesh and config options?

It is hard to use the same mesh for Euler and RANS

you can upload the mesh and config file so one can take a look at it

kulls · June 2, 2016, 07:36

Hi

I have generated unstructred Euler grid (surface tri and volume tetra)
and hybrid NS grid ( surface tri's , volume tetras, prisms and pyramid's).

The configurations files are tweaked for Euler and NS case .

In fact, in order to get the converged solution ,i tried various combinations of options available in the .cfg file but nothing worked till now as far as RANS cases are concerned.

I'm uploading the .cfg files for Euler and NS cases and grid details.
Plz share your comments !

Thanks!

Eul-m07a0b0-cfg.txt

NS-sa-m07a0b0-cfg.txt

grid-details-log.txt

balugowda · June 13, 2016, 17:46

Hi,

I am also facing the same problem. At higher angle of attacks the, the solution does not converge. (similar farfield conditions: AOA- 0 - 15, 0.8 Mach, turbulent model - SA, for a BWB aircraft)

Does anyone have any suggestions ?

I tried the following:

1- MG-0, tried without the multigrid option to check if that is the problem, but it is not in my case.
2- CFL number - Tried to play with automatic CFL number varying from 1-10, but does not converge.

Please help !

Thanks!

June 1, 2016, 02:32	RANS cases not converging in SU2 for Delta wing fighter aircraft configuration.	#1
kulls New Member Simm Join Date: Nov 2012 Posts: 10 Rep Power: 14	Hi Friends, This problem involves a delta wing fighter aircraft configuration. Initially i ran some cases(Mach = 0.7 , AoA : 0 to 16 deg., Beta = 0 ) for EULER equations using SU2 code.The convergence achieved was of the order of 5 - 8 order.Results were in close agreement with other solvers.. I tweaked the .cfg file for RANS cases but its not working. i'm trying to run RANS cases for the same flow condition and same geometry but not able to achieve convergence in any case. I request everyone to put some useful comments. Thanks! __________________ Thanks!!

June 2, 2016, 07:36	Grid Detail and configuration file	#3
kulls New Member Simm Join Date: Nov 2012 Posts: 10 Rep Power: 14	Hi I have generated unstructred Euler grid (surface tri and volume tetra) and hybrid NS grid ( surface tri's , volume tetras, prisms and pyramid's). The configurations files are tweaked for Euler and NS case . In fact, in order to get the converged solution ,i tried various combinations of options available in the .cfg file but nothing worked till now as far as RANS cases are concerned. I'm uploading the .cfg files for Euler and NS cases and grid details. Plz share your comments ! Thanks! Eul-m07a0b0-cfg.txt NS-sa-m07a0b0-cfg.txt grid-details-log.txt __________________ Thanks!!

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June 1, 2016, 08:32		#2
mlooti Member Tom Join Date: Oct 2015 Posts: 67 Rep Power: 11	Hi what is your mesh and config options? It is hard to use the same mesh for Euler and RANS you can upload the mesh and config file so one can take a look at it

June 13, 2016, 17:46		#4
balugowda New Member Join Date: Sep 2015 Posts: 2 Rep Power: 0	Hi, I am also facing the same problem. At higher angle of attacks the, the solution does not converge. (similar farfield conditions: AOA- 0 - 15, 0.8 Mach, turbulent model - SA, for a BWB aircraft) Does anyone have any suggestions ? I tried the following: 1- MG-0, tried without the multigrid option to check if that is the problem, but it is not in my case. 2- CFL number - Tried to play with automatic CFL number varying from 1-10, but does not converge. Please help ! Thanks!