temperature and pressure dependent specific heat (Cp)

Amirreza_pro · October 30, 2020, 06:30

Hi guys
I'm doing with plasma and Cp varies with T and P.
Does anyone knows how add pressure dependence in DEFINE_SPECIFIC_HEAT?
if it was dependent to only T it was easy, but now with T and P dependence i think UDF will work.
Does anyone have any suggestion?
Thanks alot

ram_call · January 23, 2022, 18:31

Hello,
The answer is late and would not be useful for you, but I am writing to others probably.
It is written in fluent UDF guide V18 nodding that it can be temperature dependant only:

"The DEFINE_SPECIFIC_HEAT macro can be used to define temperature-dependent functions for specific heat and sensible enthalpy for fluid, solid and mixture materials"
I tried to write it based on pressure and there was an error during the compilation.
it was discussed in the following link with apparently the same conclusion:
temperature and pressure dependent specific heat?

Amirreza_pro · January 24, 2022, 15:35

hi...Thanks for your reply.
But we did it by means of User-Defined Real Gas Model.
Check here to get more informations.
https://www.afs.enea.it/project/nept...ug/node337.htm

All the best
Amirreza

blinkman · May 7, 2024, 08:43

thank you, you have helped solve my problem.

October 30, 2020, 06:30	temperature and pressure dependent specific heat (Cp)	#1
Amirreza_pro Member Amirreza Niazmehr Join Date: Nov 2018 Posts: 40 Rep Power: 8	Hi guys I'm doing with plasma and Cp varies with T and P. Does anyone knows how add pressure dependence in DEFINE_SPECIFIC_HEAT? if it was dependent to only T it was easy, but now with T and P dependence i think UDF will work. Does anyone have any suggestion? Thanks alot

January 24, 2022, 15:35		#3
Amirreza_pro Member Amirreza Niazmehr Join Date: Nov 2018 Posts: 40 Rep Power: 8	hi...Thanks for your reply. But we did it by means of User-Defined Real Gas Model. Check here to get more informations. https://www.afs.enea.it/project/nept...ug/node337.htm All the best Amirreza AlexanderZ, ram_call and blinkman like this.

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January 23, 2022, 18:31		#2
ram_call Member ram Join Date: Apr 2013 Posts: 37 Rep Power: 13	Hello, The answer is late and would not be useful for you, but I am writing to others probably. It is written in fluent UDF guide V18 nodding that it can be temperature dependant only: "The DEFINE_SPECIFIC_HEAT macro can be used to define temperature-dependent functions for specific heat and sensible enthalpy for fluid, solid and mixture materials" I tried to write it based on pressure and there was an error during the compilation. it was discussed in the following link with apparently the same conclusion: temperature and pressure dependent specific heat?

May 7, 2024, 08:43		#4
blinkman New Member Jack Zhang Join Date: May 2024 Posts: 3 Rep Power: 2	thank you, you have helped solve my problem.