ICEM CFD Introductory Course-Prism Meshing

•Inflation layers

–To better simulate boundary layer effects

–Mesh orthogonal to surface with faces perpendicular to boundary layer flow direction

•Procedure

–Set Global Prism Parameters

–Select Parts to grow layers from

•Typically wall boundaries

–Set Local Parameters for each part

•Local overrides global

•Zero or blank entries will defer to global settings

–Run mesher

•From existing mesh

–Extrude into tetra/hexa mesh

–Extrude from surface tri mesh, then fill volumes

Run automatically during Volume Mesh creation

•Global Prism Parameters

–Growth law

•exponential:   height = h(r)(n-1)    [n is layer #]

•linear:                 height = h(1+(n-1)(r-1))

–Initial height of first layer – h in formulae above

•Auto calculated if not specified

–Based on factor of edge length of base triangle/quad

–Height determined so that top layer volume is slightly less than that of tetra/hex just above it

–Number of layers   n

–Height ratio   r

–Total height  of all layers

–Usually specify 3 of the above 4 parameters

•Compute params will calculate the remaining parameter (total height usually left blank)

–Or specify only Height ratio and Number of layers for auto calculation of initial height

–These are the defaults.  Individual surface/curve height/ratio/layers will override these defaults if set

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