Create solid and fluid domain in complex geometry

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  • Last Post 29 September 2019
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Mike920 posted this 28 September 2019

Hi, I want to create an outer boundary of 1cm around the geometry which i want to treat as solid domain for FSI but due to complexitiy of geometry the inbuilt functions such as Thin/Surface or Fill doesnt work. 

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peteroznewman posted this 28 September 2019

This geometry is 29 meters long and 2.5 meters thick. Is that correct?

A 1 cm boundary is 0.01 m which is 0.4% of the thickness.

If you need a thin skin in Mechanical for Structural reasons, you could just take the surface of this body to mesh with shell elements and assign the 1 cm thickness to the body.

I used the Facet tab to convert the solid to a Facet object in the outline. Then I used Shell and selected Outside and set a thickness of 10 cm. You can then convert that shelled facet body to a solid again.

 

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Mike920 posted this 28 September 2019

Thank you. It worked.

Is there any way i can fill the interior of my geometry with solid which i can use as fluid domain?

peteroznewman posted this 28 September 2019

I suggested to methods, which one did you use, the Facet tab?  If so, you get a facet body for the skin and keep the facet body you started with as the interior. Below is a sliced view of the 10 cm skin facet body.

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Mike920 posted this 28 September 2019

I used the second one. Its working fine now.

Thanks again.

Mike920 posted this 29 September 2019

 

If you need a thin skin in Mechanical for Structural reasons, you could just take the surface of this body to mesh with shell elements and assign the 1 cm thickness to the body.

I used the Facet tab to convert the solid to a Facet object in the outline. Then I used Shell and selected Outside and set a thickness of 10 cm. You can then convert that shelled facet body to a solid again.

 Hi Peter, 

      The 1st method doesnt work because in that case i cannot select the interior face for FSI 

The 2nd method works but it makes the geometry even more complicated and i also get this warning.

 

Any idea to solve this problem?

peteroznewman posted this 29 September 2019

It's not a problem, just an informational message. Yes, you want to do this. The consequence is a lot of faces on the body. There are tools to skin lots of faces with a large face to reduce the number of faces, but many faces are acceptable if a mesh with acceptable quality is created.

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