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123 lines
4.5 KiB
Plaintext
123 lines
4.5 KiB
Plaintext
/*!
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\page constructing_submeshes_page Constructing sub-meshes
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Sub-mesh is a mesh on a geometrical sub-object (sub-shape) used to assign
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different meshing algorithms and/or hypotheses than the algorithms and
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hypotheses assigned to the parent mesh on the parent geometrical
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object, that allows getting a local mesh refinement.
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A sub-shape to create a sub-mesh on should be retrieved from the shape
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of the parent mesh in one of the following ways: <ul>
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<li> In Geometry module, via <em>New Entity > Explode</em> menu.</li>
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<li> In Geometry module, by creation of a group (<em>New Entity >
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Group > Create Group</em> menu).</li>
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<li> In Mesh module, by
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\ref subshape_by_mesh_elem "selecting a mesh element" generated on a
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sub-shape of interest. This way is accessible if the mesh is
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already computed.</li>
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</ul>
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If a geometrical sub-object belongs to several geometrical objects
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having different meshes or sub-meshes, it will be meshed with the
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hypotheses of a sub-mesh of a lower dimension.<br>
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For example, a face of a box is meshed with a sub-mesh using algorithms
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and hypotheses other than the parent mesh on the whole box. The face
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and the box share four edges, which will be meshed with algorithms and
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hypotheses of the sub-mesh on the face, because the face is a 2D object
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while the box is a 3D object. <br>
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If the dimensions are the same, an arbitrary algorithm/hypothesis
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will be used. This means that an edge shared by two faces each having
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its own different sub-mesh, will be meshed using algorithms and
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hypotheses of any of the two, chosen randomly. This indeterminacy can
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be fixed by defining \ref submesh_order_anchor "Sub-mesh priority". The
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default sub-meshes priority is such that multi-dimensional algorithms
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are processed first.
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<br>
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\n Construction of a sub-mesh consists of:
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<ul>
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<li>Selecting a mesh which will encapsulate your sub-mesh</li>
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<li>Selecting a geometrical object for meshing</li>
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<li>Applying one or several previously described
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\ref about_hypo_page "hypotheses" and
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\ref basic_meshing_algos_page "meshing algorithms" which will be used
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at computation of this sub-mesh</li>
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</ul>
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<br><em>To construct a sub-mesh:</em>
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\par
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From the \b Mesh menu select <b>Create Sub-mesh</b> or click <em>"Create
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Sum-mesh"</em> button in the toolbar.
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<center>
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\image html image33.gif
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<em>"Create Sub-mesh" button</em>
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</center>
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\par
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The following dialog box will appear:
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\par
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\image html createmesh-inv2.png
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\par
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It allows to define the \b Name, the parent \b Mesh and the \b
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Geometry (e.g. a face if the parent mesh has been built on box) of the
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sub-mesh. You can select meshing algorithms and hypotheses in the same way as
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in \ref constructing_meshes_page "Create mesh" menu.
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\par
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\anchor subshape_by_mesh_elem
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If the parent mesh is already computed, then you can define the
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\b Geometry by picking mesh elements computed on a sub-shape of interest
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in the 3D Viewer, i.e. you do not have to extract this sub-shape
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in Geometry module beforehand. To start element selection, press \a
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Selection button to the right of \b Geometry label. If this button is
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already down, then click it to release and then click it again. The
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following pop-up menu allowing to choose a way of geometry definition will
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appear.
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\par
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\image html choose_geom_selection_way.png
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\par
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<b>Direct geometry selection</b> enables selecting the sub-shape in the Object
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Browser.
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<b>Find geometry by mesh element selection</b> activates the following dialog.
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\par
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\image html find_geom_by_mesh_elem.png
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\par
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In this dialog, <b> Element Type </b> defines a kind of element to pick in the
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Viewer.
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Instead of picking an element in the Viewer, you can type its
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ID in <b> Element ID</b> field.
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<b> Geometry name </b> field allows defining a name of the sub-shape,
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with which the sub-shape will appear in the Object Browser (if not yet
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there).
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\par
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In the Object Browser the structure of the new sub-mesh will be
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displayed as follows:
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\image html image10.jpg
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\par
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It contains:
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<ul>
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<li>a sub-mesh name (\a SubMeshFace1)
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<li>a reference to the geometrical object on the basis of which the
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sub-mesh has been constructed (<em>Cylindrical Face_1</em>);</li>
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<li><b>Applied hypotheses</b> folder containing the references to the
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hypotheses selected at the construction of the sub-mesh;</li>
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<li><b>Applied algorithms</b> folder containing the references to the
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algorithms selected at the construction of the sub-mesh.</li>
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</ul>
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<br><b>See Also</b> a sample TUI Script of a
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\ref tui_construction_submesh "Construct Sub-mesh" operation.
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*/
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