viscosity defined by pressure and temperature

bleseb · January 17, 2014, 08:33

Hi @all,

i want to define the viscosity as a function of pressure and temperature.
I need that to calculate an ol, that is mixed with CO2.
I just have a table, where i can go from pressure and temperature to the mix ratio and then from mix ratio and temperature to the viscosity.

Is it possible to give fluent that Table?
Do I need to programm that with UFD?
And: Maybe someone did that before and send me the UFD?

Thanks a lot!

bleseb

pakk · January 17, 2014, 10:31

Hi Bleseb.

Yes, it is possible to use such a table in Fluent.
Yes, you have to use a UDF for that.
No, I don't have such a UDF ready, and I doubt if somebody will have exactly what you want.

Make some efforts in writing such a UDF, and if you come into specific problems, you can ask here.

Good luck!
pakk

January 17, 2014, 08:33	viscosity defined by pressure and temperature	#1
bleseb New Member Join Date: Jan 2014 Posts: 1 Rep Power: 0	Hi @all, i want to define the viscosity as a function of pressure and temperature. I need that to calculate an ol, that is mixed with CO2. I just have a table, where i can go from pressure and temperature to the mix ratio and then from mix ratio and temperature to the viscosity. Is it possible to give fluent that Table? Do I need to programm that with UFD? And: Maybe someone did that before and send me the UFD? Thanks a lot! bleseb

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January 17, 2014, 10:31		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	Hi Bleseb. Yes, it is possible to use such a table in Fluent. Yes, you have to use a UDF for that. No, I don't have such a UDF ready, and I doubt if somebody will have exactly what you want. Make some efforts in writing such a UDF, and if you come into specific problems, you can ask here. Good luck! pakk