Kinematic Diffusivity as expression

kastarkas · July 20, 2018, 04:55

Hello all,
while modelling gas transport (using normal transport model by creating additional variables), required kinematic diffusivity was given as an expression.
But the expression contains the "additional variable" for the transport.

CFX says, value of additional variable is not available for computing;
I tried with inlet boundary condition value defined for the additional variable and also defined the same with value via initialising the domain....

how to solve this friends ?

Thank you for all help in advance.

ghorrocks · July 20, 2018, 07:45

Please attach your CCL.

Opaque · July 20, 2018, 09:22

Have you searched the forum for previous related posts?

Searching for "kinematic diffusivity" produces this (among others)

Diffusivity coefficient dependent on the additional variable

I think it is related.

July 20, 2018, 04:55	Kinematic Diffusivity as expression	#1
kastarkas Member kastarkas Join Date: Aug 2016 Posts: 45 Rep Power: 10	Hello all, while modelling gas transport (using normal transport model by creating additional variables), required kinematic diffusivity was given as an expression. But the expression contains the "additional variable" for the transport. CFX says, value of additional variable is not available for computing; I tried with inlet boundary condition value defined for the additional variable and also defined the same with value via initialising the domain.... how to solve this friends ? Thank you for all help in advance.

July 20, 2018, 07:45		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Please attach your CCL. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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July 20, 2018, 09:22		#3
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	Have you searched the forum for previous related posts? Searching for "kinematic diffusivity" produces this (among others) Diffusivity coefficient dependent on the additional variable I think it is related.