Boundary equation to each node of surface

Pled · January 30, 2018, 05:20

Hello everyone,
I am new to this forum and to the CfX as well. Excuse me for any elementary question.

What I want to do is, define a mesh displacement of all surface nodes towards one certain point which lies inside the fluid.

How can I do this?

AtoHM · January 30, 2018, 05:47

Hello.
In Pre you can edit the boundary details of the surface you want to move. Prior to that, you have to define a mesh motion for you domain I think. Go to domain properties and add "regions of motion specified" in the basic settings. Then, in the boundary details you can choose different options for mesh motion, in your case I think you need "specified displacement". Here you can for example give an expression to determine movement of the individual nodes.
Be aware that this can cause heavy distortion in the mesh.

Pled · January 30, 2018, 07:12

thank you for your quick response,
but can you inform me about the whereabouts of a detailed list of functions with their definitions that i can use? For example I want to use in an expression mesh nodes coordinates and I don;t know the function's name. That's why I need such a list.

ghorrocks · January 30, 2018, 17:50

In the documentation, CFX Reference guide in the chapter titled CEL Expressions.

January 30, 2018, 05:20	Boundary equation to each node of surface	#1
Pled Member Dimitrios S. P. Join Date: Jan 2018 Posts: 63 Rep Power: 8	Hello everyone, I am new to this forum and to the CfX as well. Excuse me for any elementary question. What I want to do is, define a mesh displacement of all surface nodes towards one certain point which lies inside the fluid. How can I do this?

January 30, 2018, 17:50		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	In the documentation, CFX Reference guide in the chapter titled CEL Expressions. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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January 30, 2018, 05:47		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 703 Rep Power: 13	Hello. In Pre you can edit the boundary details of the surface you want to move. Prior to that, you have to define a mesh motion for you domain I think. Go to domain properties and add "regions of motion specified" in the basic settings. Then, in the boundary details you can choose different options for mesh motion, in your case I think you need "specified displacement". Here you can for example give an expression to determine movement of the individual nodes. Be aware that this can cause heavy distortion in the mesh.

January 30, 2018, 07:12		#3
Pled Member Dimitrios S. P. Join Date: Jan 2018 Posts: 63 Rep Power: 8	thank you for your quick response, but can you inform me about the whereabouts of a detailed list of functions with their definitions that i can use? For example I want to use in an expression mesh nodes coordinates and I don;t know the function's name. That's why I need such a list.