[GAMBIT] Boundary layer in the corner

truffaldino · April 24, 2011, 17:55

Hello,

I will be grateful for info how to deal with the 2d boundary layer on highly convex boundaries ("corners") in GAMBIT. How to fix boundary layer shown on the image attached? I have set "internal continuity" option.

Truffaldino

-mAx- · May 2, 2011, 02:56

your BL seems to be to thick

truffaldino · May 6, 2011, 08:56

Yes it is thick for Gambit, but represents quite correctly the problem: a small step at the airfoil at low reynolds number. In my case bl size is of order of 1 mm at Re=50000, while the step size is of order of 5-10 mm.

-mAx- · May 6, 2011, 09:05

if the BL is to thick, Gambit should failed to create it.
In your case Gambit creates something.
If you want you can send me your dbs file, I will take a look on monday

truffaldino · May 7, 2011, 07:57

Quote:

Originally Posted by -mAx-

if the BL is to thick, Gambit should failed to create it.
In your case Gambit creates something.
If you want you can send me your dbs file, I will take a look on monday

Thanks a lot mAx,

I have already solved the problem (see image below). I have just meshed edge containing corner using curvature size function.

Truffaldino

May 2, 2011, 02:56		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	your BL seems to be to thick __________________ In memory of my friend Hervé: CFD engineer & freerider

May 6, 2011, 09:05		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	if the BL is to thick, Gambit should failed to create it. In your case Gambit creates something. If you want you can send me your dbs file, I will take a look on monday __________________ In memory of my friend Hervé: CFD engineer & freerider

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May 6, 2011, 08:56		#3
truffaldino Senior Member Join Date: Jan 2011 Posts: 249 Blog Entries: 5 Rep Power: 17	Yes it is thick for Gambit, but represents quite correctly the problem: a small step at the airfoil at low reynolds number. In my case bl size is of order of 1 mm at Re=50000, while the step size is of order of 5-10 mm.