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January 28, 2011, 14:40 |
Mesh deformation
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#1 |
New Member
morteza
Join Date: Jul 2009
Location: United States
Posts: 12
Rep Power: 17 |
I want to define a wall boundary condition which is moving and just the thing I know about its movement is the equation of motion which is y^2 + (a^2/h - h)y + x^2 + z^2 - a^2= 0 (a is a constant and h is changing with time), how can I do this ?
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January 28, 2011, 15:09 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
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If the motion is tangential to the wall you can do it by applying a tangential velocity to the wall boundary condition. If the motion has any component normal to the wall (it the fluid domain gets bigger, smaller or moves) you need moving mesh.
There are examples of both types that come with CFX tutorials. |
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January 29, 2011, 17:40 |
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#3 |
New Member
morteza
Join Date: Jul 2009
Location: United States
Posts: 12
Rep Power: 17 |
Thanks for your consideration sir.
The wall boundary moves in normal direction but the problem is that the velocity in y direction changes with x and z (as you can see in the equation) so I can not give an specific value for V. Could you please let me know how can I input a different velocity for each r (x^2 + y^2). I am kinda lost in those tutorials. I dont know if I have to write a code in fortran or I can write an expression directly on cfx. Help me |
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January 30, 2011, 04:43 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,830
Rep Power: 144 |
If you are lost in the tutorials then do them again until you understand. You will never get anywhere until you understand the basics.
You should be able to do what you propose in CEL expressions in moving mesh. No need for fortran. |
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Tags |
ccl, cel, mesh deformation |
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