k-epsilon not converging after y+ adaptation

bigbang · July 27, 2010, 07:23

I am trying to solver a vehicle ZX symmetry model of a streamlined motorcycle (basically a streamlined body with 2 wheels protruding at the base)

The solver converged on the first run. Afterwards I decided to adapt the mesh to meet the y+ max constraint of 500 for k-e realizable with standard wall function. The model will not converge. What are my options?

-2.5M cells
-20 meters x 5 meters(symm) x 5 meters
-k-e realizable with standard wall functions
-moving ground (93.56m/s)
-air speed (93.56m/s)
-rotating wheels

Thank you.

bigbang · July 28, 2010, 11:40

Ok it seemed to be a problem of mesh quality. Once I got my mesh quality to 0.25 (ICEM) by allowing 0.1 tolerance on the mesh smoother it quickly converged initially and during several Y+ cell refinement adaptations.

Thanks anyway and sorry for the beginner questions.

July 27, 2010, 07:23	k-epsilon not converging after y+ adaptation	#1
bigbang Member Alex Join Date: Jun 2010 Location: Planet Earth Posts: 43 Rep Power: 15	I am trying to solver a vehicle ZX symmetry model of a streamlined motorcycle (basically a streamlined body with 2 wheels protruding at the base) The solver converged on the first run. Afterwards I decided to adapt the mesh to meet the y+ max constraint of 500 for k-e realizable with standard wall function. The model will not converge. What are my options? -2.5M cells -20 meters x 5 meters(symm) x 5 meters -k-e realizable with standard wall functions -moving ground (93.56m/s) -air speed (93.56m/s) -rotating wheels Thank you.

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July 28, 2010, 11:40		#2
bigbang Member Alex Join Date: Jun 2010 Location: Planet Earth Posts: 43 Rep Power: 15	Ok it seemed to be a problem of mesh quality. Once I got my mesh quality to 0.25 (ICEM) by allowing 0.1 tolerance on the mesh smoother it quickly converged initially and during several Y+ cell refinement adaptations. Thanks anyway and sorry for the beginner questions.