# Which Global remeshing technique to use?

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March 30, 2012, 10:42
Which Global remeshing technique to use?
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AJ
Join Date: Feb 2012
Location: Austin, TX
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Rep Power: 7
I am trying to solve a simple transient fluid flow in which fluid is flowing over a substrate ("wall" at the bottom) and its free surface is coming in contact with a curved roller surface which is not moving [Refer to figure: Slide_1] After a few time steps it is observed that the fluid stacks up at one of the free surfaces and there is no deformation of the mesh below the roller (curved surface) as now fluid enters the gap between the roller and the substrate [Refer: Slide_2]. The simulation fails to converge as the other meshes are distorted further.

Please help me understand what needs to be done to make the fluid flow through the gap. Thanks!
Attached Images
 Slide_1.JPG (65.4 KB, 22 views) Slide_2.JPG (66.3 KB, 18 views)

 March 31, 2012, 11:55 #2 New Member   AJ Join Date: Feb 2012 Location: Austin, TX Posts: 10 Rep Power: 7 If any body has any hint on why it might not be working please comment. I have tried all I could bt still cant change result.

 January 25, 2013, 05:23 #3 Member   Join Date: Nov 2010 Posts: 30 Rep Power: 8 Hi, akhi! I'solving practically the same problem? Have you dealed with it? Any ideas?

 January 25, 2013, 12:39 #4 New Member   AJ Join Date: Feb 2012 Location: Austin, TX Posts: 10 Rep Power: 7 Hey natalie I needed to split the domain into many parts, mesh them separately and then define as one domain. Also, the boundary conditions on the free surface needs to be selected carefully.

 January 25, 2013, 17:17 #5 Member   Join Date: Nov 2010 Posts: 30 Rep Power: 8 but how have you made these edges between two zones not to go upstairs? and did the interfaces between different domains work properly? thanks for your reply

 January 25, 2013, 17:31 #6 New Member   AJ Join Date: Feb 2012 Location: Austin, TX Posts: 10 Rep Power: 7 Once the setup was defined as a single body, there wasn't any problem of flow b/w two domains. I think there might be something wrong with the boundary conditions. Try increasing the slip on the roller. Playing around with the setup a bit might give you more ideas.

 January 26, 2013, 11:46 #7 Member   Join Date: Nov 2010 Posts: 30 Rep Power: 8 Thanks for your help!

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