Ahmed body drag values inconsistency

Costas · March 22, 2016, 13:10

Hello,
so i'm trying to simulate the ahmed body for 25 slant angle. For my k-e results i got a drag of 0.236. However, using the same mesh with the SST k-w and Reynolds stress model i get values of 0.431. The continuity residuals for SST k-w does not decrease by a magnitude of 10^-3. For the mesh i'm using a first layer thickness of 3.073e-3 with 5 layers. Does anyone know what might be the reason for this and how i could improve it? I really need the help. Thanks!

Costas · March 22, 2016, 14:12

By further iterating and changing the reference area to 0.288m my residuals managed to drop significantly. However im still getting values higher than what obesrved with k-e model.

March 22, 2016, 13:10	Ahmed body drag values inconsistency	#1
Costas New Member Constantinos Join Date: Mar 2016 Posts: 19 Rep Power: 10	Hello, so i'm trying to simulate the ahmed body for 25 slant angle. For my k-e results i got a drag of 0.236. However, using the same mesh with the SST k-w and Reynolds stress model i get values of 0.431. The continuity residuals for SST k-w does not decrease by a magnitude of 10^-3. For the mesh i'm using a first layer thickness of 3.073e-3 with 5 layers. Does anyone know what might be the reason for this and how i could improve it? I really need the help. Thanks!

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March 22, 2016, 14:12		#2
Costas New Member Constantinos Join Date: Mar 2016 Posts: 19 Rep Power: 10	By further iterating and changing the reference area to 0.288m my residuals managed to drop significantly. However im still getting values higher than what obesrved with k-e model.