# Moving mesh in CFX

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 January 13, 2012, 01:52 Moving mesh in CFX #1 New Member   Ali Join Date: Dec 2011 Posts: 21 Rep Power: 5 Hi Guys, I'm going to move a flat plate up and down sinusoidally in CFX. The simulation is 2D. Does any one know How I should tackle this problem? I will appreciate, if you help me. tnx Ali

 January 14, 2012, 06:52 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 Can you post an image of what you want to do? Is the plate vertical or horizontal?

 July 31, 2012, 19:10 #3 New Member   Ali Join Date: Dec 2011 Posts: 21 Rep Power: 5 Hi, Sorry for replying late. Please have look at the tutorial posted on " https://www.box.com/shared/jicr9u3jgv". On page 3, you'll see a figure which is similar to my problem. I wan to move the middle zone sinusoidally with a flat plate. Could u please help how I can simulate this problem in CFX? Thanks, Ali

 July 31, 2012, 19:25 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 Have a look at the CFX tutorials. Several of them show how to model moving mesh.

 August 1, 2012, 00:31 #5 New Member   Ali Join Date: Dec 2011 Posts: 21 Rep Power: 5 Hi Glenn, In CFX we only have two options: stationary domain and rotating domain. In my problem, which is a 2D simulation, I want to move both the fluid within the domain as well as a flat plate sinusoidally up and down. This means that domain itself should also move sinusoidally. The plate in my simulation follows this equation (v=A*sin(wt)), where v is the vertical component of velocity. Do I need to specify the same motion for mesh deformation? (mesh motion> specified displacement> Y=v) Does it make sense? Tnx

 August 1, 2012, 07:58 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 The two options you refer to are for rotating frame of reference simulation. You are looking for moving mesh, that is different. Look at the CFX tutorials for moving mesh examples, not rotating examples.

 September 25, 2012, 15:23 #7 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Can you please explain what is the difference between moving mesh and rotating frame of reference simulation with suitable examples? when and where it is using??

 September 25, 2012, 18:56 #8 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 Moving mesh allows any mesh motion. Rotating mesh only allows rotating motion, which I guess could be considered a sub-set of moving mesh. MrinalKR likes this.

 September 25, 2012, 23:52 #9 Member   Mrinal K R Join Date: Sep 2011 Location: Chennai, India Posts: 45 Rep Power: 5 Thank you sir.. Can we produce translational along with rotational motion in CFX? I want to create translational and rotational motion of circle in CFX? Is it possible? any similar tutorials are available?

 September 26, 2012, 08:18 #10 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 Yes, it is possible but you then have to use general mesh motion. You cannot model translation with rotating frames of reference.

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