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118 lines
5.0 KiB
Plaintext
118 lines
5.0 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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\anchor non_conform_allowed_anchor
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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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\anchor quadratic_mesh_anchor
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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 curved lines and can be defined by three
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points: first, middle and last instead of an ordinary two).
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See \ref adding_quadratic_elements_page
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for more information about quadratic meshes.
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\anchor propagation_anchor
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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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\anchor propagofdistribution_anchor
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<h2>Propagation of Node Distribution on Opposite Edges</h2>
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<b>Propagation of Node Distribution on Opposite Edges</b> allows to propagate
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distribution of nodes 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 number of nodes and the same
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relations between segment lengths, 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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\anchor quadrangle_preference_anchor
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<h2>Quadrangle Preference</h2>
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This additional hypothesis can be used together with 2D triangulation algorithms.
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It allows 2D triangulation algorithms to build quadrangular meshes.
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When used with "Quadrangle (Mapping)" meshing algorithm, that is obsolete
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since introducing \ref hypo_quad_params_anchor "Quadrangle parameters"
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hypothesis, 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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\anchor viscous_layers_anchor
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<h2>Viscous Layers and Viscous Layers 2D</h2>
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<b>Viscous Layers</b> and <b>Viscous Layers 2D </b> additional
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hypotheses can be used together with either some 3D algorithms, for example
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Hexahedron(i,j,k), or 2D algorithms, for example Triangle
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(MEFISTO), correspondingly. These hypotheses allow creation of layers
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of highly stretched elements, prisms in 3D and quadrilaterals in 2D,
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near mesh boundary, which is beneficial for high quality viscous
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computations.
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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 thickness</b> - gives the total thickness of element layers.</li>
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<li><b>Number of layers</b> - defines the number of element layers.</li>
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<li><b>Stretch factor</b> - defines the growth factor of element height
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from the mesh boundary inwards.</li>
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<li><b>Specified Faces/Edges are</b> - defines how the shapes specified by
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the next parameter are used.
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<li><b> Faces/Edges with/without layers</b> -
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defines geometrical faces or edges on which element layers
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either should be or should not be constructed, depending on the
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value of the previous parameter (<b>Specified Faces/Edges are</b>).
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Faces (or edges) can be selected either in the Object Browser or in
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the VTK Viewer.
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\note A mesh shown in the 3D Viewer can prevent selection of faces
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and edges, just hide the mesh to avoid this. To avoid a long wait when a
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geometry with many faces (or edges) is displayed, the number of faces
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(edges) shown at a time is limited by the value of "Sub-shapes
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preview chunk size" preference (in Preferences/Mesh/General tab).<br>
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If faces/edges without layers are specified, the element layers are
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not constructed on geometrical faces shared by several solids in 3D
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case and edges shared by several faces in 2D case. In other words,
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in this mode the element layers can be constructed on boundary faces
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and edges only, and are not constructed on internal faces and
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edges. There is an exception to this rule: if a hypothesis is
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assigned to a sub-mesh, the element layers can be constructed on
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boundary faces/edges of the shape of this sub-mesh, at same time
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possibly being internal faces/edges within the whole model.
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\image html viscous_layers_on_submesh.png 2D viscous layers constructed on boundary edges of a sub-mesh on a disk face.
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</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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