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

Prism - Global Parameters

Smooth Tetra/Prism Transition

Leave initial height as “0”

-This causes the initial height to float in order to reduce the volume change between the last prism and adjacent tetra.

Setting Prism Parameters on Parts

Setting Prism Parameters on Volume Parts

Normally toggle prism on only for parts that contain surfaces (becomes surface mesh)

Can also toggle on prism for parts that contain material points (becomes volume mesh)

-For interior surface mesh, this defines the allowable volumes for extrusion

-Selecting no volume parts has the same result as selecting all volume parts

Setting Prism Parameters on Surfaces

Setting Prism Parameters on Curves

-Mesh > Curve Mesh Setup

-You can get Prism to transition linearly across a surface by not setting a height on the surface, but instead set a different height on each curve on the opposite sides of the prism surface

-Height ratio and Num. of layers have no affect on prism for curve settings

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