Define_Specific_heat UDF as function of both T and P

RocketGme · December 17, 2021, 06:23

Hello everyone,

In order to define the specific heat property I got that i must use the DEFINE_SPECIFC_HEAT macro. According to the manual it comes only as a function of temperature and sensible enthalpy

DEFINE_SPECIFIC_HEAT( name, T, Tref, h, yi)

As I have a database of Cp varying with both temperature and pressure, is it possibile to express property also as function of P, bypassing fluent's limit in define_specific_heat? Maybe through the use of a different udf.

Thank you for your help.

Gianmarco

RocketGme · December 21, 2021, 10:59

For anyone having the same problem, I managed to solve this using a User defined real gas model.

ved prakash · January 18, 2022, 07:19

hi, I have to give density as a function of temperature for my film cooling problem. I have a density ratio of 1.3 for my steady flow. can you help me write UDF for this?
any help would be appreciated?

AlexanderZ · January 19, 2022, 04:01

ansys fluent customization manual,

look for DEFINE_PROPERTY macro, there are few good examples

December 17, 2021, 06:23	Define_Specific_heat UDF as function of both T and P	#1
RocketGme New Member Gianmarco Join Date: Nov 2021 Posts: 10 Rep Power: 5	Hello everyone, In order to define the specific heat property I got that i must use the DEFINE_SPECIFC_HEAT macro. According to the manual it comes only as a function of temperature and sensible enthalpy DEFINE_SPECIFIC_HEAT( name, T, Tref, h, yi) As I have a database of Cp varying with both temperature and pressure, is it possibile to express property also as function of P, bypassing fluent's limit in define_specific_heat? Maybe through the use of a different udf. Thank you for your help. Gianmarco

January 19, 2022, 04:01		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	ansys fluent customization manual, look for DEFINE_PROPERTY macro, there are few good examples __________________ best regards ****************************** press LIKE if this message was helpful

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December 21, 2021, 10:59		#2
RocketGme New Member Gianmarco Join Date: Nov 2021 Posts: 10 Rep Power: 5	For anyone having the same problem, I managed to solve this using a User defined real gas model.

January 18, 2022, 07:19		#3
ved prakash New Member Ved prakash Join Date: Sep 2019 Posts: 2 Rep Power: 0	hi, I have to give density as a function of temperature for my film cooling problem. I have a density ratio of 1.3 for my steady flow. can you help me write UDF for this? any help would be appreciated?