Source import

zese · August 11, 2023, 03:02

Dear all

I have a question which confused me. I have a source term for momentum equation in x direction as follow:
(u. $\nabla$ )u+ $\nabla$ p-(1/Re) $\Delta$ u=F

where F is a volume force F(x,y,z). I have F as a text file (x,y,z,F). Now there are two questions:
1. Should I divide F by element volume of mesh then import it to cfx? I have to consider that I have F by solving a nondimensional equation in another software then I exported F in every point into CFX
2. Is there any way better than using user function in cfx to read source file?

ghorrocks · August 11, 2023, 05:09

You can make the volume force function a 3D interpolation function. Then you do not need to read a file during the solver, you just set it up in CFX-Pre.

You do not divide by the element volume. The source term should be specified in (equation units) per unit volume.

zese · August 11, 2023, 06:21

Quote:

Originally Posted by ghorrocks

You can make the volume force function a 3D interpolation function. Then you do not need to read a file during the solver, you just set it up in CFX-Pre.

You do not divide by the element volume. The source term should be specified in (equation units) per unit volume.

Thank you. do you know how I can do that. I know that matlab create interpolation in 3D by scatteredinterpolant. I mean how I can extract it and import in cfx?

ghorrocks · August 11, 2023, 06:57

Have a look at 3D interpolation functions in CFX-Pre and the documentation. They are easy to use.

August 11, 2023, 03:02	Source import	#1
zese Senior Member Zese Join Date: Sep 2013 Posts: 104 Rep Power: 13	Dear all I have a question which confused me. I have a source term for momentum equation in x direction as follow: (u. $\nabla$ )u+ $\nabla$ p-(1/Re) $\Delta$ u=F where F is a volume force F(x,y,z). I have F as a text file (x,y,z,F). Now there are two questions: 1. Should I divide F by element volume of mesh then import it to cfx? I have to consider that I have F by solving a nondimensional equation in another software then I exported F in every point into CFX 2. Is there any way better than using user function in cfx to read source file?

August 11, 2023, 05:09		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,830 Rep Power: 144	You can make the volume force function a 3D interpolation function. Then you do not need to read a file during the solver, you just set it up in CFX-Pre. You do not divide by the element volume. The source term should be specified in (equation units) per unit volume. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

August 11, 2023, 06:57		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,830 Rep Power: 144	Have a look at 3D interpolation functions in CFX-Pre and the documentation. They are easy to use. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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