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October 31, 2009, 17:29 |
Help with 3dwing mesh
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#1 |
Member
ANIL
Join Date: Apr 2009
Posts: 35
Rep Power: 17 |
I have a wing in a box. to avoid complex mesh and to hav much grid density at LE and TE of wing, i wud like to divide the wing in many computational volumes and mesh the entire cuboid including wing.
how to do that....? Is it necessary to hav a boundary layer over the wing for subsonic flow, inorder to calculate Cl and Cd? Thanks a lot! |
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November 3, 2009, 01:33 |
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#2 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 |
Gambit?
if yes --> You can divide your domain with split operations. If your volume is stll real-volume, i twill be easy. BL are not necessary, but for aero stuffs I would recommand to use them.
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In memory of my friend Hervé: CFD engineer & freerider |
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November 3, 2009, 14:26 |
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#3 |
Member
ANIL
Join Date: Apr 2009
Posts: 35
Rep Power: 17 |
Thnx Max...
yes iam using Gambit. I got a coarse vol. mesh, the Cl obtained from the simulation using pre-farfield BC's was only 50% of wht it has to be. i gave the corect reference values. so i was trying to do a good mesh by further dividing it, but the unstructured grid seems to be too complex. moreover for the nxt one i hav the wavy profile for LE of wing whch might be chalenging for me to mesh. whts the way to get an optimum mesh on wing for external flow? i need to calculate Cl, Cd and look for Cp distribution, Pre. contours and streamlines of flow. (Using fluent and Gambit, i jst strted using it) Thanx once again |
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November 4, 2009, 00:57 |
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#4 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 |
you can use the face scale tool (in Face/copy) it will create a bigger wing which should surround your actual one.
Then split your domain with this surface, it will create a subvolume (kind of very big BL) which should be meshed with hex. Then in this subvolume, you attach a real BL, and you can mesh the rest of the domain with tetra-hexcore. It should render your work a little more easier
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In memory of my friend Hervé: CFD engineer & freerider |
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November 9, 2009, 22:36 |
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#5 |
Member
ANIL
Join Date: Apr 2009
Posts: 35
Rep Power: 17 |
hi Max
I apoligize for late reply, do u hav any tutorial files, whch helps creating sub volume around wing and mesh the remaing domain wit hex-core... if u hav, plz send it to anilsmailaero@gmail.com thnx a ton. |
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November 10, 2009, 01:12 |
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#6 |
Super Moderator
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 |
There is no specific tutorial to your application.
Tutorial 3 (3. MODELING A THREE-PIPE INTERSECTION (3-D) ) may help you, using split tool. This tutorial is in the help documentation, provided from Fluent-Gambit
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In memory of my friend Hervé: CFD engineer & freerider |
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