FSI of a shell

Henry Arrigo · May 11, 2014, 16:48

Hello all,
I want to conduct a FSI simulation which is involved the vibration of a rectangular shell metal. I have to apply zero moment and zero displacements BCs on shell edges, so it seems that it has to be modeled by a surface (since moments boundary conditions are only applicable to lines). Since a shell is of zero thickness and in FSI simulations solid region should be subtracted from fluid domain, I get confused how to subtract a surface (which represents the shell) from the fluid domain. Now my questions are:
1. is this procedure correct?
2. if yes, how can I do that?
thanks

stumpy · May 12, 2014, 16:12

Yes, you can do this.
The structure should use a surface with shells as you have described.
The fluid geometry/mesh is the same as when using a thin wall in a CFD case. You need two solid bodies (but 1 part). The surface where the two solids meet is the thin wall. In CFX you'll have two wall boundary conditions; both of these can connect to the same FSI region from Mechanical.

Henry Arrigo · May 12, 2014, 17:15

Thank you Stumpy,
Is there any special treatment for modeling thin walls in CFX?

May 11, 2014, 16:48	FSI of a shell	#1
Henry Arrigo Senior Member Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 15	Hello all, I want to conduct a FSI simulation which is involved the vibration of a rectangular shell metal. I have to apply zero moment and zero displacements BCs on shell edges, so it seems that it has to be modeled by a surface (since moments boundary conditions are only applicable to lines). Since a shell is of zero thickness and in FSI simulations solid region should be subtracted from fluid domain, I get confused how to subtract a surface (which represents the shell) from the fluid domain. Now my questions are: 1. is this procedure correct? 2. if yes, how can I do that? thanks

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May 12, 2014, 16:12		#2
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	Yes, you can do this. The structure should use a surface with shells as you have described. The fluid geometry/mesh is the same as when using a thin wall in a CFD case. You need two solid bodies (but 1 part). The surface where the two solids meet is the thin wall. In CFX you'll have two wall boundary conditions; both of these can connect to the same FSI region from Mechanical.

May 12, 2014, 17:15		#3
Henry Arrigo Senior Member Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 15	Thank you Stumpy, Is there any special treatment for modeling thin walls in CFX?