CST2013: Special Solver Parameters - Solver (Hexahedral TLM)

Simulation: SolverStart SimulationSpecialsSolver

Special settings frame

Data id: This id will appear on all the result files.

Mesh type: Choose one from B-rep, Facet and Fast facet type. This is used during discretization of model.

To discretize a model for the TLM solver we create straight axial lines, or rays, that pass through the geometry at the position of each cell centre in the x, y and z directions. Then for each ray we mark the position where the ray enters and exits all geometry. We use these positions to construct the discretized model.

The Mesh Type setting is controlling which method to use to determine the positions where the rays pass through the geometry.

Fast facet: First the geometry surfaces are facetted using facet sizes determined by geometry size, surface definition and hex mesh size. Then the facetted definition of the geometry surfaces is used when performing the ray fire operation to determine where the ray hits geometry surfaces. This method is the fastest since it can be parallelized and the algorithm to find the hits is very fast when the surface is triangulated.

B-rep: This is a legacy method. It uses the analytic definition of the geometry surfaces when performing the ray fire operation. This method in theory should give the most accurate positions for the hits. The method is slow and cannot be parallelized, but we have retained it since we have seen some models where the surfaces of two objects that are touching were facetted differently and the fast facet ray fire operation led to tiny gaps between the objects.

Facet: Even older legacy method. Uses the same scheme as B-rep and just uses an alternate ACIS ray fire operation.

Use double precision solver: In the vast majority of situations single precision analysis can be used. Double precision analysis has only been found to be necessary for a class of models where a zone of the modelling region is isolated from zones containing excitation by highly conductive material.

Excite plane wave near to model: Tick this to excite plane wave near to model, else it is excited near the calculation domain bounding box.

Show result files in navigation tree: Tick this to list the result files associated with a project in the navigation tree.

Heal check all objects: Tick this to heal check all objects while doing the discretization.

Boundary settings frame

Use TLM absorbing boundary for open boundary: Tick this to use TLM absorbing boundary for open boundary condition. For open boundaries, the calculation domain is expanded by the number of layers specified here.

Allow different material boundaries to overlap: Tick this to allow different material boundaries to overlap.

Ground plane beyond the mesh frame

Define ground plane: Choose if you want to define a ground plane.

Normal position: Position of the ground plane.

Normal direction: Direction of the ground plane normal.

OK

Accepts the input and closes the dialog.

Cancel

Closes this dialog box without performing any further action.

Help

Shows this help text.