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AddLayers on an Airfoil

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Old   March 27, 2012, 11:41
Default AddLayers on an Airfoil
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Roberto Della Ratta
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Hi Foamers!
I have a problem in creating the Boundary Layer on an airfoil geometry with SHM.
The castellated and snappy phase are ok whereas "addLayers " results in no layer added. Could someone help me?
Thanks a lot

Roberto

I attach the snappyHexMeshDict and the log file for the addLayer phase
Attached Files
File Type: txt log.txt (15.2 KB, 8 views)
File Type: txt snappyHexMeshDict.txt (10.6 KB, 8 views)

Last edited by rdrr84; March 27, 2012 at 12:11.
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Old   March 27, 2012, 12:30
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Have you tried this (from your log):

Quote:
Please set nGrow=0
?
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Old   March 28, 2012, 05:42
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Roberto Della Ratta
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Hi!
thx for your answer.
Yes I did it but no layer is added... I also changed the exp ratio to 0.1 to have a greater avg thickness.

Roberto
Attached Files
File Type: txt log_2.txt (16.9 KB, 2 views)
File Type: txt snappyHexMeshDict_2.txt (10.6 KB, 6 views)
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Old   March 28, 2012, 06:00
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I would suggest you to stick with the default parameters and then change only one of them at a time. Every time remember to get rid of every file mesh related.

For example, you set
Quote:
expansionRatio 0.1;
and there's no point to me in setting this for an airfoil:



/------------------------------------------ Layer 3
| c
|
/------------------------------------------ Layer 2
| b
/------------------------------------------ Layer 1
|_a_______________________________
/////////////////////////////////////////// Wall


expansionRatio = c/b = b/a

The layers should grow in height when moving away from the wall. In your case they are getting smaller.

Also
Quote:
finalLayerThickness 0.1;
doesn't make much of a sense to me…
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Old   April 18, 2012, 06:06
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Mads Reck
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Do you need snappyHexMesh? If feasible for your airfoil you could use my little airfoil mesher, found here: http://hvirvel.dk/airfoilmesher/

Cheers,
Mads
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Old   August 22, 2012, 02:46
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Andreas Wendy
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Hi,

i have a question to the airfoil mesher. the linked website to worldofkrauss is not working to see the example dat-file. maybe you can show one?

greetings

Andy
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Old   August 22, 2012, 03:19
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Greetings to all!

@Andy: Seems like the server for the worldofkrauss website is having bad luck. You can find some information here: http://www.rcgroups.com/forums/showt...3#post22118311 - it seems it was up again in July, but went down again now in August.

Best regards,
Bruno
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