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Moving boundary condition (opening)

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Old   November 13, 2009, 06:37
Default Moving boundary condition (opening)
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I'm modelling the human brain. It is a very simple model, but the last few weeks I have a lot of problems.

The model:
In the attachments you can see the solid model (brain and skull). Between the brain and skull there is a fluid (Cerebrospinal Fluid). I modelled it as compressible water.
It is a transient simulation and the there is a displacement applied on the skull.

My problem is:
For the fluid I want to model two openings (see attachment). The mesh motion of the openings need to be unspecified. But when I do this CFX is giving me a warning.

1. Export results are unavailable as no suitable boundaries exist for use as export surfaces. Mesh motion on a boundary invalids its use as an export surface

2. Mesh motion is specified on the boundary 'opening1' in domain, 'Default Domain'. This feature is fully supported for motion that is tangent to the boundary. Solution errors will, however, be introduced if motion is normal to the boundary.

Does somebody know what I need to do??

Kind regards,

Attached Images
File Type: jpg Screenshot.jpg (58.9 KB, 26 views)
File Type: jpg fluid.jpg (56.2 KB, 25 views)
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