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August 19, 2012, 02:14 |
Deforming Wall
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#1 |
Senior Member
Syavash Asgari
Join Date: Apr 2010
Posts: 473
Rep Power: 17 |
Hi friends,
I am simulating a simple 2D duct with an inlet and outlet. I have written a UDF using Define_Grid_motion Macro for moving nodes of lower and upper walls. I have defined inlet and outlet as deforming wall(plane type) in Dynamic mesh-->Zones. The problem is that inlet and outlet do not deform with the same speed as adjacent walls. I have attached a picture of my problem after afew time steps. May you help me to find out where problem lies? tnx. |
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August 23, 2012, 03:19 |
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#2 |
Senior Member
Vaze
Join Date: Jun 2009
Posts: 172
Rep Power: 16 |
Can you please elaborate your problem? Also specify direction of motion and zone condition on figure.
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August 23, 2012, 04:06 |
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#3 | |
Senior Member
Syavash Asgari
Join Date: Apr 2010
Posts: 473
Rep Power: 17 |
Quote:
The horizontal walls are moving inward. Left vertical wall: Inlet Right vertical wall: Outlet Type of both vertical walls is"Deforming wall-->plane" which is defined in "Dynamic mesh-->zone..." The problem is that the nodes at corners do not move with the same speed as others on Horizontal walls. After a few time steps the faces which located at corners of Horizontal walls stretch in and mesh skewness increases which eventually results in negative volume appearance. Last edited by syavash; September 1, 2012 at 03:54. |
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August 31, 2012, 06:27 |
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#4 |
Senior Member
Vaze
Join Date: Jun 2009
Posts: 172
Rep Power: 16 |
Using layering option, you can simulate such problems.
Follow the problem of piston-cylinder. best wishes |
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