Add source for Dissolved oxygen

bitkiz · February 12, 2012, 12:31

Hi,

I'm trying to model mixing tank. Now, I can predict the mass transfer coefficient. I also try to predict the dissolved oxygen concentration. I specify the dissolved oxygen as an additional variable but i don't know how to add source term. I try many cases. All case give the linear solver error even if i reduce the time step.

Please give me an example for predict the dissolved oxygen.

Many thanks for your help

ghorrocks · February 12, 2012, 17:06

I strongly doubt you will find any tutorials, your application is pretty specialised. Feel free to ask CFX support, they may have some thing applicable.

Have you used any source term linearisation? This can greatly improve convergence in some situations. Read the documentation on source term linearisation.

bitkiz · February 13, 2012, 09:19

Thank you for your helpful comment. Now, I can solve this problem by specify source coefficient.

February 12, 2012, 12:31	Add source for Dissolved oxygen	#1
bitkiz New Member Pisut Join Date: May 2011 Posts: 7 Rep Power: 14	Hi, I'm trying to model mixing tank. Now, I can predict the mass transfer coefficient. I also try to predict the dissolved oxygen concentration. I specify the dissolved oxygen as an additional variable but i don't know how to add source term. I try many cases. All case give the linear solver error even if i reduce the time step. Please give me an example for predict the dissolved oxygen. Many thanks for your help

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February 12, 2012, 17:06		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,701 Rep Power: 143	I strongly doubt you will find any tutorials, your application is pretty specialised. Feel free to ask CFX support, they may have some thing applicable. Have you used any source term linearisation? This can greatly improve convergence in some situations. Read the documentation on source term linearisation.

February 13, 2012, 09:19		#3
bitkiz New Member Pisut Join Date: May 2011 Posts: 7 Rep Power: 14	Thank you for your helpful comment. Now, I can solve this problem by specify source coefficient.