About Hypotheses

Hypotheses represent boundary conditions which will be taken into account by meshing algorithms. The hypotheses allow you to manage the level of detail of the resulting mesh: when applying different hypotheses with different parameters you can preset the quantity or size of elements which will compose your mesh. So, it will be possible to generate a coarse or a more refined mesh.

The choice of a hypothesis depends on the selected algorithm.

Hypotheses are created during creation and edition of meshes and sub-meshes. Once created a hypotheses can be reused during creation and edition of other meshes and sub-meshes. All created hypotheses and algorithms are present in the Object Browser in Hypotheses and Algorithms folders correspondingly. It is possible to open a dialog to modify the parameters of a hypothesis from its context menu. This menu also provides Unassign command that will unassign the hypothesis from all meshes and sub-meshes using it. Modification of any parameter of a hypothesis and its unassignment leads to automatic removal of elements generated using it.

In MESH there are the following Basic Hypotheses:

• 1D Hypotheses (for meshing of edges):
  • Number of Segments
  • Local Length
  • Max Size
  • Adaptive
  • Arithmetic Progression
  • Geometric Progression
  • Start and end length
  • Deflection
  • Automatic Length
  • Fixed points
• 2D Hypotheses (for meshing of faces):
  • Max Element Area
  • Length from Edges
  • Quadrangle Parameters
• 3D Hypothesis (for meshing of volumes):
  • Max Element Volume

There also exist Additional Hypotheses:

• Propagation of 1D Hypothesis on opposite edges
• Propagation of Node Distribution on Opposite Edges
• Viscous layers
• Quadratic mesh
• Quadrangle preference