Definition of variable boundary condition

chevalier_b · January 20, 2013, 11:58

Hi !

I need a piece of advice from senior Fluent users. I am currently working on a aerodynamic project: I have to simulate the flow around an aircraft on all its flight envelope.

This aircraft has to climb very quickly from low to high altitude (same for the descent). I already did some simulations with steady boundary conditions and I was wondering if it was possible to define my own. I would like to define by myself the evolution of pressure and temperature all along the simulation (corresponding to the quick variations of altitude).

I checked the Fluent userguide available online and found an intersting section: "Custom field functions". Is that a tool I can use? What do you recommand?

B.

msaeedsadeghi · January 21, 2013, 05:49

You can use "DEFINE_PROFILE" UDF, Costum define functions, and Boundray Profiles.
Depending on what you have at present.

chevalier_b · January 22, 2013, 11:03

I read the Fluent userguide about those tools but wasn't able to create function or profile. Do you have a method you could explain me to include P(Z) (Static pressure in function of altitude) as variable condition ?

January 20, 2013, 11:58	Definition of variable boundary condition	#1
chevalier_b New Member Join Date: Jan 2013 Posts: 4 Rep Power: 13	Hi ! I need a piece of advice from senior Fluent users. I am currently working on a aerodynamic project: I have to simulate the flow around an aircraft on all its flight envelope. This aircraft has to climb very quickly from low to high altitude (same for the descent). I already did some simulations with steady boundary conditions and I was wondering if it was possible to define my own. I would like to define by myself the evolution of pressure and temperature all along the simulation (corresponding to the quick variations of altitude). I checked the Fluent userguide available online and found an intersting section: "Custom field functions". Is that a tool I can use? What do you recommand? B.

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January 21, 2013, 05:49		#2
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	You can use "DEFINE_PROFILE" UDF, Costum define functions, and Boundray Profiles. Depending on what you have at present.

January 22, 2013, 11:03		#3
chevalier_b New Member Join Date: Jan 2013 Posts: 4 Rep Power: 13	I read the Fluent userguide about those tools but wasn't able to create function or profile. Do you have a method you could explain me to include P(Z) (Static pressure in function of altitude) as variable condition ?