![]() True of false to enable explicit method for feature snap process - Detect (geometric only) features by sampling the surface True of false to enable implicit method for feature snap process The implicit method has the advantage of being fully automated." "The explicit method offers greater control and, from our experience, provides slightly better feature conformation. Now snappyHexMesh can identify surface geometric features using resolveFeatureAngle keyword directly from stl file Take advantage of extracted feature edges and attract points Now there are two possible method that can be used: In the latest version of OpenFOAM feature snap process has been improve. Maximum number of snapping relaxation iterations. This option changes how many times the mesh will run a relaxing script that removes some bad mesh point, however snappyHexMesh should stop before, when the correct mesh is created Number of mesh displacement relaxation iterations. ![]() the higher this number is the longer tha snapping will take the higher this number is the more equidistant mesh will be created when it comes to the boundary the higher this number is the better mesh quality will be gained This option changes how many times the "snapping" part of snappyHexMesh should be run: Relative distance for points to be attracted by surface feature point This option changes how long distance the program should look for a point to snap, the distance will be the number put in "tolerance" * "size of the mesh". Number of patch smoothing iterations before finding correspondence The more iterations, the smoother the mesh will become This option changes how many times the exterior (the boundary wall) should be iterated. Unfortunately they rarely can adjust the bad snapping on sharp edges (see cube case for an example). The snapping process is governed by four parameters that control the number of iterations and tolerance between mesh and STL surface. The new implicit method "uses the resolveFeatureAngle keyword entry to identify surface geometric features" directly from stl file. If the user want to implement feature snap process without particular refinement on edges, is now possible to avoid the creation of featureEdge file. SurfaceFeatureExtract is now useless (for snappyHexMesh) Data can be saved in VTK (ASCII) format and then be used by snappyHexMesh." "Users can generate feature edge meshes in Paraview by using the Feature Edges filter. "In the latest version, users can specify levels of refinement based on distance to a feature " In the new version of OpenFOAM something has changed: This section is also important to implement feature snapping process in order to (partially) avoid sharp edges problems. Last input file150extraction is the name given to the feature set. Value of includedAngle can be changed, but usually with 150 all features can be captured. SurfaceFeatureExtract -includedAngle 150 constant/triSurface/file.stl file150extraction eMesh file can be obtained with the surfaceFeatureExtract utility. ![]() This is a featureEdgeMesh, read from constant/triSurface for now. Specifies a level for any cell intersected by its edges. In this section the user can set specific refinement level for geometry's feature edges.
0 Comments
Leave a Reply. |