considering of walls

RyanBari · July 18, 2017, 04:19

Hi dude
I have a problem when I'm running in CFX. My geometry is a hydro-cyclone and I wanna simulate flow within it. When I create the mesh in gambit and define boundary conditions as a wall, there is no problem, however, when I was running in CFX, there is not any wall in the result at vortex finder(outlet at top of the hydro-cyclone, Plz see pic). I mean you can see a pipe which a part of it is in the hydro-cyclone in the second pic and unfortunately there is not in the result. Actually on that wall, there are two walls at one section; for example, wall 14 and shadow wall 14 because of that wall is in contact with the fluid and solid simultaneously. I tried to simulate in Fluent and there was no problem but CFX apparently does not consider those walls. Please help ASAP.
Thanks in advance

ghorrocks · July 18, 2017, 05:49

The import from gambit to CFX probably does not include internal wall definitions. If the block faces are available in CFX-Pre you can define it as a wall using those. Have a look at the mesh structure visible in the tree in CFX-Pre.

Opaque · July 18, 2017, 08:30

As Glenn suggested look at the mesh details in the tree. If the wall14 and shadow wall14 show up, you can create an interface joining both mesh surfaces, and make the interface a thin wall (basically a baffle).

Run the case, and you will see the pipe wall effect on the flow.

Good luck.

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July 18, 2017, 05:49		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The import from gambit to CFX probably does not include internal wall definitions. If the block faces are available in CFX-Pre you can define it as a wall using those. Have a look at the mesh structure visible in the tree in CFX-Pre.

July 18, 2017, 08:30		#3
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	As Glenn suggested look at the mesh details in the tree. If the wall14 and shadow wall14 show up, you can create an interface joining both mesh surfaces, and make the interface a thin wall (basically a baffle). Run the case, and you will see the pipe wall effect on the flow. Good luck.