Explanation of common mesh generation methods in workbench

Today I'd like to introduce to you Workbench Common mesh generation methods , And some advantages and disadvantages and precautions for use .

01

First of all, tetrahedral mesh generation is the most commonly used . Its advantages and disadvantages are as follows ：

advantage ：

A、 Any body can always use tetrahedral mesh

B、 Can quickly , Automatic generation , It is also applicable to complex geometry

C、 It is easy to use the curvature and approximate size functions to automatically refine the mesh in key areas

shortcoming ：

A、 In the case of approximate mesh density , The number of cells and nodes is higher than that of hexahedral mesh

B、 It is generally not possible to arrange meshes in one direction

C、 Due to the heterogeneity of geometry and element properties , Not suitable for thin bodies or rings

Under the control of tetrahedron , There are two main methods .

Patch Conforming

First, all the faces and edges of the geometry are considered by default Delaunay or Advancing Front The surface mesher generates surface meshes ( Be careful : Some internal defects are below the minimum size limit ). 

Patch Independent

Generate volume mesh and map to surface to generate surface mesh . If there is no load , Boundary conditions or other effects , Faces and their boundaries ( Edges and vertices ) There is no need to consider . This method allows for poor quality CAD The geometric .

02

Another big category is hexahedral mesh , stay Workbench in , Want to achieve hexahedral meshing , There are mainly the following methods , Pictured 1 Shown .

chart 1 Hexahedral mesh generation method

among Thin sweep method Is in Sweep To set the secondary selection , Of course, as the name suggests , Thin sweep is more suitable for mesh generation of thin-walled parts , General source surface / The ratio of side dimension is 5 above .

In general use Sweep method Hexahedral mesh generation , Mainly for relatively regular geometric models , Pictured 2 Shown ;

chart 2 Hexahedral mesh

We can also use Workbench To provide us with the means of detection , Judge whether the mesh can be generated by the sweeping method , Pictured 3 Shown .

chart 3

ANSYS WORKBENCH Project example detailed document download about Multi region meshing , It can try to automatically cut and mesh some irregular geometric models , Of course, the overall adaptability is worse than tetrahedral mesh method . For pyramid and triangular prism meshes , Not many applications , I won't go into details here .