# Mesh @ Free Surface

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 May 19, 2008, 11:34 Mesh @ Free Surface #1 MAB Guest   Posts: n/a hi I am trying to creat regular waves in one domain. Do you have any idea how to handle the mesh at free surface. or how to achieve a finer mesh at free surface withing the range of wave amplitude. thanking in advance MAB

 May 23, 2008, 00:27 Re: Mesh @ Free Surface #2 Mehul Guest   Posts: n/a Hi MAB, It don't know much about your system, But if you want to create free surface between water and air in one geometry. Then two seperate domains should be created and the region where the seperation occurs, you will require fine mesh. Divide whole verticle height in three domains, mesh individually, then using CEL expression define different material for different domains. Assume this could help you..

 May 23, 2008, 10:48 Re: Mesh @ Free Surface #3 MAB Guest   Posts: n/a Hi Mehul thanks allot for your advice, I like this idea of 3 domains. Could you please explain me bit more about "how to define the multiple domains" . Also if you could tell more about how to create mesh using CEL. is there any tutorial on this. bundle of thanks. MAB

 May 26, 2008, 13:12 Re: Mesh @ Free Surface #4 Jonathan Guest   Posts: n/a It is problematic to achieve a detailed enough mesh using unstructured tetra elements without getting way too many elements. This is because you need very fine mesh in the isosurface W direction, but you don't need fine mesh along the UV-directions. Unstruct tetras will give you fine mesh in three dimensions and your element count goes very high. In this case a structured mesh works much better, since you can have very flat elements. As an example I use a mesh with 10 mm W resolution but around 0.1-0.3 m UV resolution for yacht hull free surface simulations.

 May 27, 2008, 08:09 Re: Mesh @ Free Surface #5 Phil Guest   Posts: n/a You can also use an unstructured mesh by using stretched prism elements (inflation) off the quiescent free surface location.

 May 27, 2008, 10:28 Re: Mesh @ Free Surface #6 MAB Guest   Posts: n/a I have used a line spacing control to achieve a fine mesh at free surface. it works fine in 2D. But how can a implement it in 3D. Any Idea????????????

 May 28, 2008, 13:25 Re: Mesh @ Free Surface #7 Phil Guest   Posts: n/a If you create the 'water' and 'air' portions as separate 3D regions when you create the geometry, you should be able to inflate off of the region boundaries. This is possible with CFX Mesh, not sure about other meshers. The separate 3D regions can be included in the same domain when you define the physics.

 May 29, 2008, 04:48 Re: Mesh @ Free Surface #8 MAB Guest   Posts: n/a Hi Phill, Thanks for this idea. it seems perfect. Could you give me any further tips on how to define separate 3D regions.is there any tutorial on this? Should I just draw two separate rectangles with a common face (interface of water and air) and then extrude it to make 3D?

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