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Surface Mesh

CST software uses the Finite Integration Method (FI-Method) on hexahedral and tetrahedral meshes. For the integral equation solver surface meshes are used (see Which Mesh to Use). The following topics explain how a surface mesh influences the simulation and what requirements should be fulfilled to obtain good results on surface meshes. For an overview on hexahedral and tetrahedral meshing, see Mesh Generation Overview (Hexahedral) and Mesh Generation Overview (Tetrahedral), respectively.

Mesh and simulation

The mesh influences the accuracy and the simulation time of the solver.

Viewing the mesh

The mesh can be displayed in the Mesh View.

Automatic mesh generation

A surface mesh is generated by an automatic mesh generator. If a solver will be started with a surface method, the mesh generator will be started automatically, unless a valid surface mesh already exists.

Alternatively, you may run the mesh generation to view the mesh before you start a specific solver by selecting Mesh: Mesh ControlUpdate in the Mesh View. Previewing the mesh is not necessary, but is recommended to obtain some insight as to whether the defined problem is sufficiently resolved by the mesh, particularly if you do not use the adaptive mesh refinement.

Mesh and structure approximation - surface and mesh

Shape boundaries and sheets are discretized by the surface mesh consisting of triangles. A fine surface mesh will result in a good approximation of the structure geometry.

The set of triangles is called the surface mesh.

Controlling the mesh globally

The behavior of the automatic mesh generation can be changed by adjusting its parameters. These parameters can be accessed from the global mesh properties dialog box (Mesh: Mesh ControlGlobal Properties, ) and the corresponding specials sub dialog box. (Mesh: Mesh ContolGlobal PropertiesSpecials...).

Controlling the mesh locally for specific structure elements

It is possible to set specific mesh control values for single-structure elements. This can be carried out by selecting the corresponding shape and choosing either Mesh: Mesh ControlLocal Properties or Local Mesh Properties from the context menu.

Note that by multi-selection (holding down the CTRL key while selecting a shape) it is possible to simultaneously set the mesh property for several shapes.

Setting a locally finer mesh may be recommended for

structure elements of high importance for the simulation
shapes with a too coarse geometry representation in the mesh (e.g. a cylinder, for which the mesh representation does not look smooth enough).


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