Massflow imbalance

Hamidzoka · May 16, 2018, 00:47

Hi everyone;
Applying endwall fillets in multi-row simulations increases massflow imbalance. (up to 0.7% in some cases!). Neither fine meshes nor increased mesh concentrations around the fillets does not solve the problem. Is there any specific guideline to lower the error level?

Thanks

DarylMusashi · May 16, 2018, 03:27

You may check the .mf file (with expert parameter IWRIT=1 activated) to check the flux losses over the interfaces. Shock waves near the interface can also result in mass flow imbalances. Might this be the case in your application? I am not sure if it is directly related to the fillets.

Hamidzoka · May 16, 2018, 04:42

Thanks for the prompt response!
Actually the case has no shocks at interfaces. on the other hand the strange issue is that the imbalance is quite lower in similar case with no endwall fillets.

May 16, 2018, 00:47	Massflow imbalance	#1
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 282 Rep Power: 18	Hi everyone; Applying endwall fillets in multi-row simulations increases massflow imbalance. (up to 0.7% in some cases!). Neither fine meshes nor increased mesh concentrations around the fillets does not solve the problem. Is there any specific guideline to lower the error level? Thanks

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May 16, 2018, 03:27		#2
DarylMusashi Senior Member Holger Dietrich Join Date: Apr 2011 Location: Germany Posts: 174 Rep Power: 15	You may check the .mf file (with expert parameter IWRIT=1 activated) to check the flux losses over the interfaces. Shock waves near the interface can also result in mass flow imbalances. Might this be the case in your application? I am not sure if it is directly related to the fillets.

May 16, 2018, 04:42		#3
Hamidzoka Senior Member Hamid Zoka Join Date: Nov 2009 Posts: 282 Rep Power: 18	Thanks for the prompt response! Actually the case has no shocks at interfaces. on the other hand the strange issue is that the imbalance is quite lower in similar case with no endwall fillets.