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Old   June 2, 2008, 10:49
Default Dynamic mesh motion using CFX
  #1
Anant
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Hello All,

I would like to know how to set up the dynamic mesh motion in CFX (for hexa and/or tetra elements, with birth /death of mesh cells)

Thanking you

Anant
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Old   June 3, 2008, 07:01
Default Re: Dynamic mesh motion using CFX
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Mehul
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Anant,

Are you setting up for rotor stator application?
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Old   June 3, 2008, 07:35
Default Re: Dynamic mesh motion using CFX
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Anant
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Hello Mehul,

thanks for your reply, no , its not for the rotor stator application,

its like valve movement, I need to use adding and deleting cells (cell birth and death type) on the either side of the valve as it moves near & away from wall.

Do you have any method to use the dynamic mesh motion..? for the problem stated--?

please let me know

Thanking you Anant

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Old   June 4, 2008, 03:24
Default Re: Dynamic mesh motion using CFX
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Benjamon
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As far as I know, CFX do not allow you to use remeshing (add and delete cells). The only option in dynamic mesh is referred as "smoothing": moving the cell nodes as if there were connected with springs. This is only valid for small displacsments (if not high skew cells are obtained).

I was said that CFX will get the Fluent remeshing capability in the release 13. We will have to wait 2 or 3 years...
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Old   February 27, 2014, 07:28
Smile How to simulate a piston???
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mohammad
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Hi everyone.
I am going to simulate a piston-cylinder assembly. the Diameter of the piston is 47 mm, stroke 27 mm and the frequency is 120Hz.

How can I simulate the model? Because I heard that dynamic mesh is only for small amplitude vibration, because a dense mesh is required inside the zone in which the movement takes place.

Thanks in advance
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Old   February 27, 2014, 08:17
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Glenn Horrocks
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Dynamic mesh in CFX can most certainly handle piston-cylinder motion. I have used it in hundreds of models. A hint: the motion is easier if you start the model at TDC and expand the mesh, rather than compressing it from BDC. But with a bit of tweaking of the mesh motion parameters you can make it work either way.

Also dynamic remeshing can help too.
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