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[snappyHexMesh] Using snappyHexMesh to fill cells within predefined boundary |
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April 9, 2010, 09:28 |
Using snappyHexMesh to fill cells within predefined boundary
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#1 |
Senior Member
Kevin Smith
Join Date: Mar 2009
Posts: 104
Rep Power: 17 |
Does snappyHexMesh require a background mesh to work? What I'd like to do is predefine all my boundaries (farfield and body-fitted), and then let snappy fill in the cells. As I understand it, snappy lets you import a geometry file (*.stl), but you must place it in a preexisting mesh.
Best regards, Kevin |
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April 19, 2010, 08:49 |
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#2 |
Member
Marine
Join Date: Mar 2010
Posts: 38
Rep Power: 16 |
First you have to mesh the domain around your surface with blockMesh and then with the snappyHexMEsh you can choose to keep the external or internal field of your geometry.
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April 20, 2010, 15:55 |
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#3 |
Senior Member
Kevin Smith
Join Date: Mar 2009
Posts: 104
Rep Power: 17 |
Okay I guess that answers my question then. I don't know exactly how the snappy algorithm works, but I wonder if it's capability could be extended to total automatic meshing, given all boundary meshes (body and far-field).
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April 21, 2010, 04:03 |
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#4 |
Senior Member
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Hi,
there is a program called Icon FOAMpro which handles snappyhexmesh in a comfortable way for the customers of of Icon http://www.iconcfd.com/. It is not part of OpenFoam but a seperate product. Some of the customers are Audi,Volkswagen, Seat and Bombadier. In an presentation given at OSCIC2009 http://www.opensourcecfd.com/confere...oceedings.html http://www.opensourcecfd.com/confere...2009_Islam.pdf Slides 21,22,25,29 you will see that snappyhex mesh is the base for Meshing but that some additional features like cell quality optimisation are added by icon. A perfectly tweaked "dictonary" for snappyhex mesh is important, as automatik meshing of a windtunnel simulation with 47 Mio cells takes them 2,5 hours on a 193 cpu core computer. If I am not mistaken snappyhex has been used for farfield mesh http://engits.eu/cms/index.php?id=5 but I am not sure. elvis |
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May 21, 2010, 04:09 |
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#5 |
Member
Join Date: Nov 2009
Posts: 36
Rep Power: 16 |
Hi Elvis,
looks quite interesting. Did you ask icon for their snappy-adaptation? Snappy is a part of an opensource system. If icon's snappy is based on OpenCFD's snappy it is opensource as well. They have to provide it to everybody, I think if they give it to their customers. Best regards stawrogin |
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