to control the quality of the approximation of the curved surfaces ( Mesh Control). The dialog contains settings to influence the non-manifold model creation stage ( Model preparation) and the mesh refinement settings e. The mesh generation can be further controlled by parameters accessible by the "Special." button in the dialog box. In the dialog one can define global mesh generation parameters such as maximum and minimum cell size.
#ALTERNATIVES TO DMESH UPDATE#
You can force a mesh update by clicking the Update button in the mesh properties dialog box or by choosing Mesh: Mesh Control > Update ( ). Since the creation of the tetrahedral mesh is a computational expensive task, the mesh is not automatically updated after each change. The global mesh properties dialog box ( Home: Mesh > Global Properties, ) allows you to change the mesh preview to the tetrahedral mesh type if this has not already been done by a previous solver run. However, in order to visualize the mesh before running a simulation, you can enter the mesh view at any time ( Home: Mesh > Mesh View, ). The tetrahedral mesh will be automatically created whenever a solver is started requesting this type of mesh. The following picture shows a 2D example of how mesh optimization can improve mesh quality: In contrast, mesh optimization is a technique that swaps edges and faces and reconnects them to form better quality tetrahedrons. Mesh smoothing is an iterative scheme that moves the mesh nodes in order to improve the quality of the tetrahedrons. Once the initial volume mesh is created, its quality can be improved by mesh smoothing or mesh optimization. Mesh the model’s volumes based on surface mesh: "volume meshing" Mesh the model’s edges and faces: "surface meshing" The tetrahedral mesh generation can be summarized as follows: The following picture illustrates this procedure:
The non-manifold model guarantees that the surface meshes of neighboring solids are identical at their interfaces since they are built from the same surface mesh of the mutual double-sided face. Based on this surface mesh, the volume mesh can then be created afterward. Once this is done, the edges and faces of the model can be meshed in a first step. This intermediate operation converts coincident faces from two solids to a single common double-sided face. The typical solution to this problem is to create a "non-manifold" simulation model first. If the meshes were created independently for both blocks, the meshes might become inconsistent at the interfaces. The following picture shows two blocks touching each other at one of their faces. The solution methods require consistent meshes at the interfaces of different parts in order to set up the matrix equations correctly. Let us assume that a model consisting of several parts needs to be meshed. Surface and Planar).įirst, we explain the basic procedure of creating a tetrahedral mesh. Similar considerations apply to other unstructured mesh types (e. The following section focuses on the principles of unstructured volume mesh generation (e. Mesh Generation Overview (Tetrahedral) Mesh Generation Overview (Tetrahedral) Unstructured Mesh Generation
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