elements at the intersection of Cartesian cells with the geometrical
boundary.
-\image html cartesian3D_sphere.png "A shpere meshed by Body Fitting algorithm"
+\image html cartesian3D_sphere.png "A sphere meshed by Body Fitting algorithm"
The meshing algorithm is as follows.
<ol>
</li>
</ol>
To apply this algorithm when you define your mesh, select <b>Body
- Fitting</b> in the list of 3D algorithms and click <em> "Add
- Hypothesis" </em> button and <em>"Body Fitting Parameters"</em>" menu
-item. Dialog of <b>Body Fitting Parameters
- hypothesis</b> will appear.
+ Fitting</b> in the list of 3D algorithms and add <b>Body Fitting
+ Parameters</b> hypothesis. The following dialog will appear:
<br>
\anchor cartesian_hyp_anchor
This dialog allows to define
<ul>
<li>\b Name of the algorithm. </li>
+
<li> Minimal size of a cell truncated by the geometry boundary. If the
size of a truncated grid cell is \b Threshold times less than a
initial cell size, then a mesh element is not created. </li>
+
<li> <b> Implement Edges </b> check-box activates incorporation of
geometrical edges in the mesh.
-\image html cartesian_implement_edge.png "'Implement Edges' switched off (left) and on (right)"
- <li> Cartesian structured grid. Location of nodes along each grid axis
- is defined individually. <b> Definition mode </b> chooses a way of
- grid definition:
+
+\image html cartesian_implement_edge.png "Implement Edges switched off to the left and on to the right"
+
+ <li> <b>Definition mode</b> allows choosing how Cartesian structured
+ grid is defined. Location of nodes along each grid axis is defined
+ individually:
<ul>
<li> You can specify the \b Coordinates of grid nodes. \b Insert button
- inserts a node at distance \b Step (negative or positive) from a
- selected node. \b Delete button removes a selected node. Double
+ inserts a node at \b Step distance (negative or positive) from the
+ selected node. \b Delete button removes the selected node. Double
click on a coordinate in the list enables its edition.
\b Note that node coordinates are measured along directions of
axes that can differ from the directions of the Global Coordinate
<em>f(t)</em> where \a t is a position along a grid axis
normalized at [0.0,1.0]. The whole range of geometry can be
divided into sub-ranges with their own spacing formulas to apply;
- \a t varies between 0.0 and 1.0 within each sub-range. \b Insert button
- divides a selected range into two ones. \b Delete button adds the
+ \a t varies between 0.0 and 1.0 within each sub-range. \b Insert button
+ divides a selected range into two. \b Delete button adds the
selected sub-range to the previous one. Double click on a range in
the list enables edition of its right boundary. Double click on a
function in the list enables its edition.
</li> </ul>
</li>
- <li> Coordinates of a <b> Fixed Point</b>. They allow to exactly
- locate a grid node in a direction defined by spacing. If all the three
- directions are defined by spacing, then there will be a mesh node at
- the <b> Fixed Point</b>. If two directions are defined by spacing,
- then there will be at least a link between mesh nodes passing through
- the <b> Fixed Point</b>. If only one direction is defined by spacing,
- then there will be at least an element facet passing through
- the <b> Fixed Point</b>. If no directions are defined by spacing,
- <b> Fixed Point</b> is disabled.</li>
- <li> <b> Directions of Axes</b>. You can set up almost any
- directions of grid axes that can help in generation of as many as
- possible hexahedral elements.
+
+ <li> <b> Fixed Point</b> group allows defining an exact location of
+ a grid node in the direction defined by spacing. The following cases
+ are possible:
+ <ul>
+ <li>If all three directions are defined by spacing, there will
+ be a mesh node at the <b> Fixed Point</b>. </li>
+ <li>If two directions are defined by spacing, there will be at
+ least a link between mesh nodes passing through the <b> Fixed
+ Point</b>.</li>
+ <li> If only one direction is defined by spacing, there will be
+ at least an element facet passing through the <b> Fixed
+ Point</b>.</li>
+ <li>If no directions are defined by spacing, <b> Fixed Point</b>
+ is disabled.</li>
+ </ul>
+ </li>
+
+ <li> <b> Directions of Axes</b> group allows setting the directions of grid axes.
<ul>
- <li><b> Orthogonal Axes </b> check-box, if activated, keeps the
- axes orthogonal during their modification. </li>
+ <li>If <b> Orthogonal Axes </b> check-box is activated the
+ axes remain orthogonal during their modification. </li>
<li> Selection buttons enable snapping corresponding axes to
direction of a geometrical edge selected in the Object
Browser. Edge direction is defined by coordinates of its end
points.</li>
<li><b> Optimal Axes</b> button runs an algorithm that tries to
- set the axes so that a number of generated hexahedra to be
- maximal.</li>
+ set the axes to maximize the number of generated hexahedra.</li>
<li><b> Reset </b> button returns the axes in a default position
parallel to the axes of the Global Coordinate System.</li>
- </ul></li>
-</ul>
+ </ul>
+ </li>
+ </ul>
<br>
<b>See Also</b> a sample TUI Script of a
