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surface orientation airfoil/domain always misaligned |
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#1 |
Senior Member
Klaus
Join Date: Mar 2009
Posts: 280
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Hello,
I've created a flow domain including an airfoil to do a quasi 2D flow simulation (as I couldn't figure out whether there's a way to create a 2D mesh with boundary layer cells which is then extruded into 3D - just one layer thick). My problem is, that the surface orientation is always wrong. Either the airfoil is correct OR the domain is correct but I am not able to change the surface orientation of just one of them to align them as needed for meshing. I need a volume mesh between the outside of the airfoil and the inside of the domain of course. As you can see on the picture, the back (inside of the flow domain) has the wrong surface orientation. How can I change the surface orientation of individual elements (airfoil or domain)? Klaus |
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#2 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
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Greetings Klaus,
According to this tutorial: https://github.com/enGits/engrid/wik...ing_Geometries - section "Importing Geometries": Quote:
Bruno Last edited by wyldckat; April 4, 2015 at 16:27. Reason: fixed link |
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#3 |
Senior Member
Klaus
Join Date: Mar 2009
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thank you for your feedback, but I didn't use Blender and "Correct surface orientation" changes the surface orientation of all faces so I end up with the same problem the other way around.
Klaus |
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#4 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
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Hi Klaus,
Mmm... if the surfaces are already roughly consistent in the orientation, you should be able to control which side the volume mesh should be generated, as explained near the end of the section "Setting Up the Boundary Conditions": https://github.com/enGits/engrid/wik...ary_Conditions There is also a utility in OpenFOAM named surfaceOrient. You can check how it's used by running: Code:
surfaceOrient -help ![]() Best regards, Bruno |
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#5 | |
Senior Member
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Quote:
I agree with Bruno's suggestion and in addition you can also try this option from Jens Höpken's blog, which can be quite helpful: http://www.sourceflux.de/blog/preparing-geometry/ Another way around could be to correct the surface orientation of your "airfoil.stl" file and then later on merge it with your bounding box defining the computational domain extent. Good luck, Taxalian |
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#6 |
Member
thomas
Join Date: Jul 2014
Posts: 50
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Hi,
one quick question: does it make a difference on which direction the normal vectors are pointing, whether it´s an external or an internal flow? Or does it only matter that the direction of all vectors is consistent (all out, all in)? Thanks in advance! |
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#7 | |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
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Quote:
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#8 |
Member
thomas
Join Date: Jul 2014
Posts: 50
Rep Power: 12 ![]() |
Hi,
thanks! |
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