refineWallLayer for reaching y+<1 for low Re number turbulence model
Dear foamer i have a big promlem, i want to analysis two turbulence models on 3 element airfoil,
1. high Re number e.g realizableKE ==> 30 <y+ <200
2. low Re number e.g lunderSharmaKE ==> y+ <1
i use snappyHexMesh for meshin the domain aroun the airfoil, and after finishing the analysis with realizableKE, i execute "yPlusRAS" and it told me y+ is:
Time = 3400
Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting RAS turbulence model realizableKE
Patch 5 named main_solid y+ : min: 3.92116 max: 92.2824 average: 41.5749
Patch 6 named flap_solid y+ : min: 11.3159 max: 75.4566 average: 34.844
Patch 7 named slat_solid y+ : min: 17.4322 max: 61.5812 average: 43.726
and the checkMesh for RealizableKE doeasn't complain of skewness and nonOrthogonality,
here it is:
Create polyMesh for time = 3400
Time = 3400
internal points: 0
internal faces: 182800
faces per cell: 6.02834
boundary patches: 8
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
tet wedges: 0
Breakdown of polyhedra by number of faces:
faces number of cells
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
topAndBottom 496 996 ok (non-closed singly connected)
inlet 176 354 ok (non-closed singly connected)
outlet 176 354 ok (non-closed singly connected)
front 91461 94173 ok (non-closed singly connected)
back 91461 94173 ok (non-closed singly connected)
main_solid 1298 2596 ok (non-closed singly connected)
flap_solid 376 752 ok (non-closed singly connected)
slat_solid 314 628 ok (non-closed singly connected)
Overall domain bounding box (-5.84378 -11.1882 0.15) (20.9289 9.3226 0.250001)
Mesh (non-empty, non-wedge) directions (1 1 0)
Mesh (non-empty) directions (1 1 0)
***Number of edges not aligned with or perpendicular to non-empty directions: 33
<<Writing 30 points on non-aligned edges to set nonAlignedEdges
Boundary openness (4.30491e-19 -2.30373e-20 -1.93086e-13) OK.
Max cell openness = 2.10615e-16 OK.
Max aspect ratio = 6.91795 OK.
Minimum face area = 4.88326e-08. Maximum face area = 0.0100272. Face area magnitudes OK.
Min volume = 4.88326e-09. Max volume = 0.00100272. Total volume = 43.645. Cell volumes OK.
Mesh non-orthogonality Max: 62.2458 average: 3.79811
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 2.67447 OK.
Coupled point location match (average 0) OK.
Failed 1 mesh checks.
but when i execute refineWallLayer for reaching lower layer thickness near the wall and also lower y+ that was proper for lunderSharmaKE, the checkMesh complain skewness alot.
what should i do?:(:(:(
how should i yeild the low y+ with snappyhexMesh???
please guide me:(
here it is some pics of adding layer to main element
here it is some pics of adding layer to the leading edge of main element
here is some pics of adding layer to another element of 3 element airfoil (slat)
here is some pic of slat
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