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91 lines
3.6 KiB
Plaintext
91 lines
3.6 KiB
Plaintext
/*!
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\page additional_hypo_page Additional Hypotheses
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\n <b>Additional Hypotheses</b> can be applied as a supplement to the
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main hypotheses, introducing additional concepts to mesh creation.
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To define an <b>Additional Hypothesis</b> simply select it in
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<b>Create Mesh</b> menu. These hypotheses are actually changes in the
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rules of mesh creation and as such don't possess adjustable values.
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<h2>Non Conform mesh allowed hypothesis</h2>
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<b>Non Conform mesh allowed</b> hypothesis allows to generate non-conform
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meshes (that is, meshes having some edges ending on an edge or face of
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adjacent elements).
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<h2>Quadratic Mesh</h2>
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Quadratic Mesh hypothesis allows to build a quadratic mesh (whose
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edges are not straight but broken lines and can be defined by three
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points: first, middle and last) instead of an ordinary one.
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<h2>Propagation of 1D Hypothesis on opposite edges</h2>
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<b>Propagation of 1D Hypothesis on opposite edges</b> allows to propagate a
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hypothesis onto an opposite edge. If a local hypothesis and
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propagation are defined on an edge of a quadrangular face, the
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opposite edge will have the same hypothesis, unless another hypothesis
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has been locally defined on the opposite edge.
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<br><b>See Also</b> a sample TUI Script of a
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\ref tui_propagation "Propagation hypothesis" operation
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<h2>Quadrangle Preference</h2>
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This additional hypothesis can be used together with Quadrangle (Mapping) and Netgen 2D
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algorithms.
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It allows Netgen 2D to build quadrangular meshes at any conditions.
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It allows Quadrangle (Mapping) to build quadrangular meshes even if the number
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of nodes at the opposite edges of a meshed face is not equal,
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otherwise this mesh will contain some triangular elements. <i>This use
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case is obsolete now. Use <b>Quadrangle Parameters</b> hypothesis with
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type <b>Quadrangle Preference</b> set instead.</i>
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<br>
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This hypothesis has one restriction on its work: the total quantity of
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segments on all four sides of the face must be even (divisible by 2).
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<h2>Triangle Preference <i>(obsolete)</i></h2>
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This additional hypothesis can be used only together with Quadrangle (Mapping)
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algorithm. It allows to build triangular mesh faces in the refinement
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area if the number of nodes at the opposite edges of a meshed face is not equal,
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otherwise refinement area will contain some quadrangular elements.
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<i>This hypothesis is obsolete now. Use <b>Quadrangle Parameters</b>
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hypothesis with type <b>Triangle Preference</b> set instead.</i>
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\anchor viscous_layers_anchor
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<h2>Viscous Layers</h2>
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<b>Viscous Layers</b> additional hypotheses can be used together with
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several 3D algorithms: NETGEN 3D, GHS3D and Hexahedron(i,j,k). This
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hypothesis allows creation of layers of highly stretched prisms near
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mesh boundary, which is beneficial for high quality viscous
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computations. The prisms constructed on the quadrangular mesh faces are
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actually the hexahedrons.
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\image html viscous_layers_hyp.png
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<ul>
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<li><b>Name</b> - allows to define the name of the hypothesis.</li>
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<li><b>Total thicknes</b> - gives total thickness of layers of prisms.</li>
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<li><b>Number of layers</b> - defines number of layers of prisms.</li>
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<li><b>Stretch factor</b> - defines factor of growth of height of
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prisms from the mesh boundary towards inside of mesh.</li>
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<li><b>Faces without layers</b> - defines geometrical faces on which
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layers of prisms should not be constructed. By default the layers of
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prisms are not constructed on geometrical faces shared by solids.</li>
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</ul>
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\image html viscous_layers_mesh.png A group containing viscous layer prisms.
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<br><b>See also</b> a sample TUI script of a \ref tui_viscous_layers
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"Viscous layers construction".
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*/
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