If you want to add a mass source term, there is a derivative of the mass fraction in

chemasstrans · October 7, 2022, 02:47

In the component transport problem, in addition to the convection term, the component conservation equation also contains a coefficient multiplied by the derivative of the mass fraction in the x direction. Can this item be regarded as a mass source term ? How to write this udf if you can ?
Is there any other way to deal with it ? This is a convection diffusion problem. The governing equations are mass conservation and momentum conservation.
Thank you all

LuckyTran · October 7, 2022, 09:37

The coefficient multiplied by derivative is the diffusion term.

October 7, 2022, 02:47	If you want to add a mass source term, there is a derivative of the mass fraction in	#1
chemasstrans New Member xianyu hou Join Date: Oct 2022 Posts: 1 Rep Power: 0	In the component transport problem, in addition to the convection term, the component conservation equation also contains a coefficient multiplied by the derivative of the mass fraction in the x direction. Can this item be regarded as a mass source term ? How to write this udf if you can ? Is there any other way to deal with it ? This is a convection diffusion problem. The governing equations are mass conservation and momentum conservation. Thank you all

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October 7, 2022, 09:37		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	The coefficient multiplied by derivative is the diffusion term.