2D airfoil simulation using fluent

losiola · December 8, 2018, 15:15

hey guys I am new to ansys fluent ,
Now am making a 2d airfoil simulation using the KOmegaSST turbulence modele ,
when i started the program i set it to double precision and i set my convergence cteriria to be 1e-6 for all the variables. but once i run the simulation it converges till 2e-6 for velocity pressure k and Omega but for the continuity equation it remains stuck at 2e-5.
Can you help me with that?!!

LuckyTran · December 8, 2018, 17:48

The continuity residual is scaled different than the others, it's normalized by the worst residual in the 1st 5 iterations. I would ignore the continuity residual altogether and focus on why you can't achieve 1e-06 on the transport variables.

losiola · December 9, 2018, 03:23

LuckyTran

thank you for the answer i'll try to modify the mesh than ill try to re-run the simulation and tell you what i get.

December 8, 2018, 15:15	2D airfoil simulation using fluent	#1
losiola Member Os Join Date: Jun 2017 Posts: 80 Rep Power: 8	hey guys I am new to ansys fluent , Now am making a 2d airfoil simulation using the KOmegaSST turbulence modele , when i started the program i set it to double precision and i set my convergence cteriria to be 1e-6 for all the variables. but once i run the simulation it converges till 2e-6 for velocity pressure k and Omega but for the continuity equation it remains stuck at 2e-5. Can you help me with that?!!

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December 8, 2018, 17:48		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	The continuity residual is scaled different than the others, it's normalized by the worst residual in the 1st 5 iterations. I would ignore the continuity residual altogether and focus on why you can't achieve 1e-06 on the transport variables.

December 9, 2018, 03:23		#3
losiola Member Os Join Date: Jun 2017 Posts: 80 Rep Power: 8	LuckyTran thank you for the answer i'll try to modify the mesh than ill try to re-run the simulation and tell you what i get.