Additional Hypotheses can be applied as a supplement to the main hypotheses, introducing additional concepts to mesh creation.
To define an Additional Hypothesis simply select it in Create Mesh menu. These hypotheses are actually changes in the rules of mesh creation and as such don't possess adjustable values.
Non Conform mesh allowed hypothesis allows to generate non-conform meshes (that is, meshes having some edges ending on an edge or face of adjacent elements).
Quadratic Mesh hypothesis allows to build a quadratic mesh (whose edges are not straight but broken lines and can be defined by three points: first, middle and last) instead of an ordinary one.
Propagation of 1D Hypothesis on opposite edges allows to propagate a hypothesis onto an opposite edge. If a local hypothesis and propagation are defined on an edge of a quadrangular face, the opposite edge will have the same hypothesis, unless another hypothesis has been locally defined on the opposite edge.
See Also a sample TUI Script of a Propagation hypothesis operation
This additional hypothesis can be used together with 2D triangulation algorithms. It allows 2D triangulation algorithms to build quadrangular meshes.
This hypothesis has one restriction on its work: the total quantity of segments on all four sides of the face must be even (divisible by 2).
Viscous Layers additional hypothesis can be used together with 3D algorithms, Hexahedron(i,j,k) for example. This hypothesis allows creation of layers of highly stretched prisms near mesh boundary, which is beneficial for high quality viscous computations. The prisms constructed on the quadrangular mesh faces are actually the hexahedrons.
See also a sample TUI script of a Viscous layers construction.