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February 12, 2017, 07:03 |
y+ and wall distance
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#1 |
Member
bye bye my blue
Join Date: Sep 2016
Posts: 37
Rep Power: 8 |
Hi I'm simulating 2D aifoil with salome 7.8
I wanna wall distance. I made mesh with salome, and on FOAM got y+ my goal is 20<y+<30 on FOAM function (simplefoam -postprocess -func yPlus), I could got min :~ max : ~ average : ~ then, average : ~ is y+?? I don't know what is y+(min or max or average) and at (http://www.pointwise.com/yplus/) there is wall distance (delta s), its mean is grid size in viscous layer?? Thanks |
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February 12, 2017, 09:33 |
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#2 |
Member
Declan
Join Date: Oct 2016
Location: Ireland
Posts: 40
Rep Power: 9 |
Hi there,
The y+ value will vary over your airfoil between the min and max values you got from the post-processing. If you want 20<y+<30 everywhere (is this the case?) then you need to adjust your grid so that y+_min and y+_max both fall within this range. The calculator you shared a link to computes the grid size, delta s, along the wall that you need to achieve the specified y+. So plug in y+=20 and y+=30 on the left and it will tell you what grid size to use. |
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