|April 5, 2012, 05:51||
temperature and pressure dependent specific heat?
Join Date: Apr 2012
Posts: 1Rep Power: 0
How to add pressure dependence in DEFINE_SPECIFIC_HEAT?
I'm doing with plasma, Cp varies with T and P drastically.....
Thank you for any suggestion.
|April 18, 2012, 12:16||
specific heat func. of temperature
Join Date: Sep 2011
Posts: 4Rep Power: 6
I'm working with plasma modeling and require thermodynamic properties of argon as a function of temperature (at least, but it should also be pressure dependant).
I did a simple UDF for the specific heat, but it keeps giving me the same error once I try to initializate the calculation: "Warning: Incorrect Specific Heat value"
the UDF is:
real x = T/1000.; /*input temp in kK*/
a1 =8.064;b1 =13.92;c1 =2.721;a2 =2.907;b2 =28.19;c2 =19.67;
SpecHeat = a1*exp(-pow(((x-b1)/c1),2.)) + a2*exp(-pow(((x-b2)/c2),2.));
SpecHeat=SpecHeat/1000.; /* the specific heat material property value is in [J/kg-K]*/
I used similar eqs for thermal conductivity and viscosity. Does anybody what could be wrong?.
|December 16, 2012, 03:10||
Join Date: Oct 2012
Posts: 227Rep Power: 6
I have the same problem when injected particles get vaporized, the warning "incorrect specific heat value" occures.
|December 18, 2012, 10:46||
Join Date: Dec 2012
Posts: 79Rep Power: 4
I made a Service Request and Fluent answered that it is NOT possible to write an UDF with pressure-dependend Specific Heat right now. I hope they will change this in the future. I tried it on my own, DEFINE_PRPERTY works fine but DEFINE_SPECIFIC_HEAT is crap.
Use the USER FORTRAN in CFX
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