# How to define 2 grids to move the inner object?

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 April 12, 2011, 08:09 How to define 2 grids to move the inner object? #1 New Member   Hans Johans Join Date: Apr 2011 Posts: 6 Rep Power: 6 problem description: I want to simulate a case with a moving object. Can somebody help me and give some ideas for the principal approach. It should be similar to this project http://www.youtube.com/watch?v=S-p0uau9nGA I would solve it in this way: 1. Design the grid of the big rectangle (with a rectangle-shaped hole in the middle) 2. Design grid of the small rectangle with the object in the middle 3. Write a UDF for movement 4. Use the fluent funktion to reshape the grid during the simulation. (dynamic meshing) My questions: 1. Do I have to divide the 2 rectangles in the mesher or in the geometry-builder? When I use the Designmodeler, draw the 2 rectangle and the object, click then on "surface from sketches", the space between inner rectangle and circle is empty. And I don't know how to avoid that. Some Ideas? 2. Are there any faults in my plan? 3. Any suggestions to improve it? Last edited by lepetitmort; April 12, 2011 at 11:21.

 April 13, 2011, 12:05 #2 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 These are separate overlapping grids? I have never actually solved one of these, but I would guess that you probably need to mesh them separately, not as a single model. Then overlap the mesh models in the solver. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

 April 16, 2011, 08:01 #3 New Member   Hans Johans Join Date: Apr 2011 Posts: 6 Rep Power: 6 The trick is 1. to make TWO sketches. 2. splitface

 April 16, 2011, 11:05 #4 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 That will get you your nested box structure, but won't allow the one mesh to fall thru the other... Or do you mean to morph th outer box? Sorry, I thought you planned for overlapping grids. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

 June 30, 2011, 11:38 mesh morphing #5 Member   Marco Evangelos Biancolini Join Date: May 2009 Location: Rome - Italy Posts: 77 Rep Power: 8 I think that the problem can be faced using the mesh morphing tool RBF Morph (www.rbf-morph.com).

 July 1, 2011, 15:58 #6 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 I have looked at a variety of morphing tools and none are more powerful or better integrated into Fluent than RBF-Morph... Simon __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

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