Menu: Mesh->Mesh quality
This option opens a window that shows information about the quality of the mesh elements.
There are ten criteria used to measure the quality of the elements, or to provide with some measure of the mesh:
- Triangles: The shape quality (q) of triangles is measured as
where Area is the area of the triangle, and l_i (i=1..3) are the lengths of the triangle's edges.
- Tetrahedra: The shape quality (q) of tetrahedra is measured as
where Volume is the volume of the tetrahedron, and l_i (i=1..6) are the lengths of the tetrahedron's edges.
- Quadrilaterals: The shape quality (q) of quadrilaterals is measured as the quality of the worst quality node. The quality of a node (q_n) is given by
where l_1 and l_2 are the lengths of concurrent edges of the node, and Area_n is the area of a fictitious parallelogram, made with these two edges.
- Hexahedra: The shape quality (q) of hexahedra is measured as the quality of the worst quality node. The quality of a node (q_n) is given by
where l_1, l_2, l_3, A_1, A_2, A_3 are the lengths and areas of concurrent edges and faces of the node, and Volume_n is the volume of a fictitious parallelepiped, made with these concurrent faces.
There are two visualization modes:
In the MeshQuality window, if you double click on a value, the elements below this value are selected in red. These selected elements can be sent to a layer using the Send To Layer button in the Mesh Quality window.
In this example we are studying the mesh using the minimum angle criterion. We can see that between 1935 and 2902 elements approximately of our mesh have an angle of less than 43.4 degrees. If we double-click on the graphic, the elements which have an angle smaller than 43.4 degrees will be selected.