6/13/2023 0 Comments Extruded features to multipatch![]() Default is false.Īngle at which the face is too concave and will be split. Default is true.Īvoid attraction of points across the diagonal of the face which would result in a collapsed face. Walk along the the feature edges to identify connected feature edges. Releasing attraction close to a feature to allow more freedom for displacement. Avoid using the splitting from the first iteration by setting the parameter to one half of the nFeatureSnapIter parameter Default = -1 (disabled).Įxplicitly turn on/off detecting baffle edges. The settings is typically followed by the layerTerminationAngle and detectExtrusionIsland parameters in addLayerControls dictionary. ![]() To create an edge on the volumetric mesh aligned favourably with the features nFaceSplitInterval parameter may be used. Resulting in no prismatic layer coverage in the area. Where the mesh quality fails the extrusion is disabled. ![]() Unsuccessful alignment will result in concavity which consequently will lead to non-orthogonality on the extruded mesh at the layer adding phase. Default = false.Įxisting cell edges are aligned with feature lines by default. This is useful for multi-region meshing where the internal mesh must conform the region geometrical boundaries. When using explicitFeatureSnap and this switch is on, features between multiple surfaces will be captured. Snap mesh onto the feature lines defined in eMesh file. Switch turning on the implicit feature specification. If not specified, feature snapping will be disabled. Number of relaxation iterations used for snapping onto the features. If the mesh does not conform the geometry and all the iterations are spend, user may try to increase the number of iterations. Number of relaxation iterations during the snapping. Multiplied by local cell-edge length specifies region along the surface within which the points are attracted by the surface Implicit algorithm behaves correctly on simple meshes without sharp corners and baffles. In such case snappyHexMesh does not read eMesh file and defines the sharp edges itself. Other option is to use implicit feature definition. Therefore more iterations are typically needed.įeatures may be specified explicitly using surfaceFeatureExtract utility which creates the eMesh file (located in constant/triSurface directory) with the feature line specification. While during the surface snapping the points are displaced in the normal direction to the surface, displacement to the edge is more complicated. The mesh is snapped to the features after the surface snapping step. Each step is reversible.Īfter the successful snapping or running out of iterations mesh is cleaned from unnecessary non-orthogonal planar faces. This process is repeated until the maximum number of iterations is reached. After mesh quality check the next attempt to move the point towards the geometry takes place. If the mesh quality is violated, vertices are moved back in a given fraction of the step (keyword errorReduction in the shQualit圜ontrols dictionary). Only those vertexes are attracted to the surface which are located in the region defined by the local edge length multiplied by the tolerance entry from the snapControls dictionary (by default set to 2). ![]() Then, in the morphing stage displace the vertexes towards the surface. The algorithm first smooth the mesh on the patches and in the volume. The parameters need to be set for snapping onto the surfaces and features separately. The good practice is to start with the default values and adjust them only after inspecting the mesh. ![]() The sequence ensures that the resulting mesh achieves a minimum quality, at the expense of full geometry conformation. If the adaptations invalidate the mesh quality criteria the step is undone and replayed using modified parameters. the surfaces and features, in an iterative process. Snapping involves projecting and morphing the mesh to, e.g. These controls are located in the snapControls sub-dictionary. The snapping phase attempts to adapt the castellated mesh to conform to the input geometry. ![]()
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