specific heat in UDF

November 21, 2001, 08:10

Hi! Why the C_CP(c,t) in FLUENT 5 UDF does not work? How can define this parameter in UDF? Thanks, best reguards.

gino.

November 21, 2001, 20:30

You can't - don't ask me why though - its something Fluent dreamt up! You may be able to fudge this by modifying the density since the heat capacity is rho*Cp but be careful sine this will impact other terms in the eqns.

Greg

November 22, 2001, 01:42

I think that this macro works correctly but only in compiled version of UDF (not interpreted).

November 22, 2001, 23:16

Oh, sorry - I may have misunderstood.

There should be no problem using that macro to read the current value of CP in a cell. But what I meant was, you can't change the definition of CP using that macro in your udf. You can only use the definitions of CP that Fluent have provided.

If you find otherwise let me know.

Greg

November 21, 2001, 08:10	specific heat in UDF	#1
gino Guest Posts: n/a	Hi! Why the C_CP(c,t) in FLUENT 5 UDF does not work? How can define this parameter in UDF? Thanks, best reguards. gino.

November 21, 2001, 20:30	Re: specific heat in UDF	#2
Greg Perkins Guest Posts: n/a	You can't - don't ask me why though - its something Fluent dreamt up! You may be able to fudge this by modifying the density since the heat capacity is rho*Cp but be careful sine this will impact other terms in the eqns. Greg

November 22, 2001, 01:42	Re: specific heat in UDF	#3
Michal Guest Posts: n/a	I think that this macro works correctly but only in compiled version of UDF (not interpreted).

November 22, 2001, 23:16	Re: specific heat in UDF	#4
Greg Perkins Guest Posts: n/a	Oh, sorry - I may have misunderstood. There should be no problem using that macro to read the current value of CP in a cell. But what I meant was, you can't change the definition of CP using that macro in your udf. You can only use the definitions of CP that Fluent have provided. If you find otherwise let me know. Greg

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