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78 lines
4.0 KiB
ReStructuredText
78 lines
4.0 KiB
ReStructuredText
.. _revolution_page:
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**********
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Revolution
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**********
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Revolution is used to build mesh elements of plus one
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dimension than the input ones. Boundary elements around generated
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mesh of plus one dimension are additionally created. All created
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elements can be automatically grouped. Revolution can be used to create
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a :ref:`structured mesh from scratch <extrusion_struct>`.
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See :ref:`extrusion_page` page for general information on Revolution,
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which can be viewed as extrusion along a circular path.
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*To apply revolution:*
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.. |img| image:: ../images/image92.png
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.. |sel| image:: ../images/image120.png
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#. From the **Modification** menu choose the **Revolution** item or click **"Revolution"** button in the toolbar.
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The following dialog will appear:
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.. image:: ../images/revolution1.png
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:align: center
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#. In this dialog:
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* Use *Selection* button |sel| to specify what you are going to select at a given moment, **Nodes**, **Edges** or **Faces**.
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* Specify **Nodes**, **Edges** and **Faces**, which will be revolved, by one of following means:
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* **Select the whole mesh, sub-mesh or group** activating this check-box.
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* Choose mesh elements with the mouse in the 3D Viewer. It is possible to select a whole area with a mouse frame.
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* Input the element IDs directly in **Node IDs**, **Edge IDs** and **Face IDs** fields. The selected elements will be highlighted in the viewer, if the mesh is shown there.
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* Apply Filters. **Set filter** button allows to apply a filter to the selection of elements. See more about filters in the :ref:`filtering_elements` page.
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* Specify the **Axis** of revolution:
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* Specify the coordinates of the start **Point** of the axis of revolution; either directly or by picking a node in the Viewer (selection of nodes is activated as you click the *Selection* button).
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* Specify the **Vector** of the axis in either of three ways:
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* directly adjust vector components;
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* click *Selection* button, choose **From Origin to selected Point** in the opened menu and pick a node in the Viewer;
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* click *Selection* button, chose **Normal to selected Face** in the opened menu and pick a mesh face in the Viewer.
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* Specify the **Angle** of revolution and the **Number of steps** of revolution,
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* **Angle by Step** - the elements are revolved by the specified angle at each step (i.e. for Angle=30 and Number of Steps=3, the elements will be extruded by 30 degrees twice for a total of 30*3=90)
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.. image:: ../images/revolutionsn2.png
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:align: center
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.. centered::
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Example of Revolution with Angle by Step. Angle=30 and Number of Steps=3
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* **Total Angle** - the elements are revolved by the specified angle only once and the number of steps defines the number of iterations (i.e. for Angle=30 and Number of Steps=3, the elements will be revolved by 30/3=10 degrees twice for a total of 30).
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.. image:: ../images/revolutionsn1.png
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:align: center
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.. centered::
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Example of Revolution with Total Angle. Angle=30 and Number of Steps=3
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* Specify the **Tolerance**, which is used to detect nodes lying on the axis of revolution.
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* Activate **Preview** check-box to see the result mesh in the viewer.
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* If you activate **Generate Groups** check-box, the **result elements** created from **selected elements** contained in groups will be included into new groups named by pattern "<old group name>_rotated" and "<old group name>_top". For example if a selected quadrangle is included in *g_Faces* group (see figures below) then result hexahedra will be included in *g_Faces_rotated* group and a quadrangle created at the "top" of revolved mesh will be included in *g_Faces_top* group.
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.. image:: ../images/extrusion_groups.png
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:align: center
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.. image:: ../images/extrusion_groups_res.png
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:align: center
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This check-box is active only if there are some groups in the mesh.
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#. Click **Apply** or **Apply and Close** button to confirm the operation.
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**See Also** a sample TUI Script of a :ref:`tui_revolution` operation.
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