Retrieve Value from CEL Expression

Charon · April 13, 2013, 09:05

Hi,

i have got a question about the use of CEL Expressions in ANSYS CFX.

I want to define the Massflow through an Inlet by using an cel expression. The density of the fluid is temperture depenent, but the temperture of the fluid entering at the inlet is constant during the simulation. Until now i evatuated the density at the given inlet-temperature manually and enterd the result in the configuration tab.

My question is:
Is there an cel expression to evaluate the density at a given temperature?

Something like:
Inlet_Density = evaluate(Oil_Density,300[K])

Thank for your help.

ghorrocks · April 14, 2013, 07:14

You cannot define something like the "function" gizmo in most programming languages. So just write the expression out for each variable which uses it. Alternately you can use a 1D or 3D interpolation function.

Charon · April 15, 2013, 04:03

Thank you ghorrocks for your replie.

After reading your reply I realized that the my posted question was kind of sensless. In the end i don't know what i was thinking, when i was posting it.

According to your reply, i will just copy the expression for the density an fill in the expression for the inlet-temperature at the nessecary places. Thanks.

April 13, 2013, 09:05	Retrieve Value from CEL Expression	#1
Charon New Member Join Date: Apr 2013 Posts: 4 Rep Power: 13	Hi, i have got a question about the use of CEL Expressions in ANSYS CFX. I want to define the Massflow through an Inlet by using an cel expression. The density of the fluid is temperture depenent, but the temperture of the fluid entering at the inlet is constant during the simulation. Until now i evatuated the density at the given inlet-temperature manually and enterd the result in the configuration tab. My question is: Is there an cel expression to evaluate the density at a given temperature? Something like: Inlet_Density = evaluate(Oil_Density,300[K]) Thank for your help.

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April 14, 2013, 07:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You cannot define something like the "function" gizmo in most programming languages. So just write the expression out for each variable which uses it. Alternately you can use a 1D or 3D interpolation function.

April 15, 2013, 04:03		#3
Charon New Member Join Date: Apr 2013 Posts: 4 Rep Power: 13	Thank you ghorrocks for your replie. After reading your reply I realized that the my posted question was kind of sensless. In the end i don't know what i was thinking, when i was posting it. According to your reply, i will just copy the expression for the density an fill in the expression for the inlet-temperature at the nessecary places. Thanks.