Mesh

A mesh subdivides each domain of the simulation model, the cavity, cooling channel, and runner, into discrete cells.

Within each cell, the software applies the appropriate conservation equations. The conservation equations compute the flow of melted polymer and heat, simulate phase change as the melt cools, and predict residual stresses and their effect on the unconstrained part shape.

The solid and shell analysis procedures require mesh definitions for the computation. The mesh requirements differ for each procedure.

Shell Analysis Procedure

The shell analysis procedure is a simplification for thin parts, based on a Hele-Shaw type flow approximation. The analysis procedure uses a proprietary binary-plane discretization approach, the basis of which is a triangular surface mesh. The software does not create a part volume mesh, and the mesh is classified as a shell mesh.

Solid Analysis Procedure

The solid analysis procedure subdevides the volume of each domain into polyhedral-shaped elements. The software generates these elements automatically. These solid elements may have one of three shapes: Tetrahedral, hexahedral, or prismatic. The required mesh for this analysis type is classified as a solid mesh.

The software still creates a surface mesh, as in the surface mesh procedure, but the surface elements (faces) effectively represent the boundaries of the enclosed solid polyhedral elements.

Tetrahedral Element Hexahedral Element Prismatic Element

When creating a plastics study, the choice of analysis procedure determines the selection of appropriate mesh type.