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-   -   AddLayers on an Airfoil (http://www.cfd-online.com/Forums/openfoam-meshing-snappyhexmesh/99159-addlayers-airfoil.html)

rdrr84 March 27, 2012 11:41

AddLayers on an Airfoil
 
2 Attachment(s)
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

lovecraft22 March 27, 2012 12:30

Have you tried this (from your log):

Quote:

Please set nGrow=0
?

rdrr84 March 28, 2012 05:42

2 Attachment(s)
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

lovecraft22 March 28, 2012 06:00

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…

MadsR April 18, 2012 06:06

Do you need snappyHexMesh? If feasible for your airfoil you could use my little airfoil mesher, found here: http://hvirvel.dk/airfoilmesher/

Cheers,
Mads

A.Wendy August 22, 2012 02:46

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

wyldckat August 22, 2012 03:19

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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