UDF for Thermodynamic property function of P and T

Federer83 · February 4, 2019, 17:12

Hi guys,

I have created a thermodynamic database for my fluid function of P and T and i would like to use it in my FLUENT calculation.
I heard that in the past this was not possible in FLUENT. Is this problem being solved with the newest version?
If so, how can i write an UDF to run my simulation?

Many thanks in advance,

pakk · February 5, 2019, 06:02

Have you checked the Fluent help? It is practically there in the "Define_Property UDFs" section.

Federer83 · February 6, 2019, 12:32

Thanks Pakk. Yes I have checked the DEFINE_Property function, however i didnt get it if this could work also for the specific heat. I have a matrix for specific heat function of pressure and temperature and i would like to use it since my fluid is affected by big pressure an temperature drops. Do you know if it is possible?

AlexanderZ · February 11, 2019, 01:45

for specific heat use DEFINE_SPECIFIC_HEAT macro

best regards

Federer83 · February 11, 2019, 09:03

Hi Alexanderz

Do you think i can set the cp function of the P and T with this function? I read that you can only specify the variation of the cP with T.

AlexanderZ · February 11, 2019, 22:24

I remember same information, only T. But you may try, it is not so difficult

best regards

Bluewave · February 12, 2019, 05:41

It's definitely possible using Define_Property macros. I have used it earlier to model high temperature transport properties using chapman-enskog method. You can try

February 4, 2019, 17:12	UDF for Thermodynamic property function of P and T	#1
Federer83 New Member Fab Join Date: Dec 2018 Posts: 13 Rep Power: 8	Hi guys, I have created a thermodynamic database for my fluid function of P and T and i would like to use it in my FLUENT calculation. I heard that in the past this was not possible in FLUENT. Is this problem being solved with the newest version? If so, how can i write an UDF to run my simulation? Many thanks in advance,

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February 5, 2019, 06:02		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	Have you checked the Fluent help? It is practically there in the "Define_Property UDFs" section.

February 6, 2019, 12:32		#3
Federer83 New Member Fab Join Date: Dec 2018 Posts: 13 Rep Power: 8	Thanks Pakk. Yes I have checked the DEFINE_Property function, however i didnt get it if this could work also for the specific heat. I have a matrix for specific heat function of pressure and temperature and i would like to use it since my fluid is affected by big pressure an temperature drops. Do you know if it is possible?

February 11, 2019, 01:45		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	for specific heat use DEFINE_SPECIFIC_HEAT macro best regards

February 11, 2019, 09:03		#5
Federer83 New Member Fab Join Date: Dec 2018 Posts: 13 Rep Power: 8	Hi Alexanderz Do you think i can set the cp function of the P and T with this function? I read that you can only specify the variation of the cP with T.

February 11, 2019, 22:24		#6
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	I remember same information, only T. But you may try, it is not so difficult best regards

February 12, 2019, 05:41		#7
Bluewave New Member SS Join Date: Sep 2018 Posts: 6 Rep Power: 8	It's definitely possible using Define_Property macros. I have used it earlier to model high temperature transport properties using chapman-enskog method. You can try