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Old   June 20, 2007, 03:36
Default Modeling construction with movable details
  #1
Bloshchitsyn Vladimir
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Hello! I simulate device with moving details. I use mesh motion... And have 2 surface with Wall BC - movable (use mesh motion condition) and stationary (use unspecified motion condition) ... Distance between this surface in some place very small (near piston construction for exmaple)

Mesh motion of movable surface cause motion of stationary wall mesh... I try use different mesh stiffnes values, but it's not help!

Give me advice, please!
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Old   June 20, 2007, 08:18
Default Re: Modeling construction with movable details
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Joe
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I have noticed this problem too at times. You can set the mesh on the misbehaving surface as fixed but this often results in over distortion of the core mesh.
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Old   June 20, 2007, 16:28
Default Re: Modeling construction with movable details
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Gert-Jan
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Use Fluent (Or Star CD?) for this type of problems. Their dynamic meshing technology is way beyond CFX. I have used it for flying objects travelling through my geometry.

Gert-Jan

www.bunova.nl
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Old   June 20, 2007, 18:37
Default Re: Modeling construction with movable details
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Glenn Horrocks
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Hi,

In CFX you can also set the mesh using fortran and a junction box. This means you have complete control over the mesh, but you have to write some fortran code to do it.

Regards, Glenn Horrocks
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Old   June 21, 2007, 05:45
Default Re: Modeling construction with movable details
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Gert-Jan
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We used the 6DOF solver of Fluent to calculate floating objects through a long pipe with water. Nice simulations and good results. Beforehand we asked CFX if they could do the job with their 6DOF-solver but they had a lot of doubts. An I do not remember that they mentioned your option.

For Twin Screw compressors we also use the dynamic remeshing options of Fluent. CFX has an option with SCORG but my colleague says this won't work as well.

Gert-Jan

www.bunova.nl
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