SMS:Rectangular Patch: Difference between revisions

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[[Image:Rectangular_patch.gif]]
#REDIRECT [[SMS:Patches]]
 
Elements can be made to fill a rectangular area by choosing the Rectangular  Patch option from the Elements menu. To define a rectangular patch, four  nodestrings must be selected. The nodestrings must connect at the ends.
 
The coordinates of the new nodes on the interior of the patch are computed  by constructing a partial bicubic Coons patch using the nodestrings as patch  edges. This ensures that interior nodes are smoothly interpolated from the nodes  making up the perimeter of the patch. Patches are applicable when the data  points are gathered along parallel lines, such as cross sections in a river. The  following options are available for each edge of the rectangular patch:
* '''Use original nodes''' – This option causes the original  nodes from the nodestring to be used as corner nodes of elements along the  boundary.
* '''Distribute nodes''' – This option distributes the  specified number of nodes as corner nodes of elements along the boundary. If  elements already exist on the boundary, then this option is unavailable.
* '''Bias''' – This is used with the Distribute nodes option.  It causes the spacing of nodes along the nodestring to be weighted more to one  of the corners.
 
After the spacing on each side is defined, click the Preview button to see  how the patch will look. If changes are desired, they can be made. When the  patch looks good, click the OK button to accept it. The patch can be canceled by  clicking the Cancel button. Be careful to use the preview button because THERE  IS NO UNDO FOR THIS OPERATION.
 
The elements in a new patch are checked to make sure they do not overlap each  other. If any problems are detected, an error message is given and the patch is  not created. Errors may occur especially when the region is highly irregular in  shape. In such cases, the region can either be divided into smaller patches, or  it can be filled using a different mesh generation technique.
 
The following are some hints when using rectangular patches:
* The curvature of the patch can change somewhat, but it should not switch  directions. If it does, then the patch should be split at the inflection point  of the curve.
* Although opposite sides in the rectangular patch are not required to have the  same number of nodes, the best patches occur when this is close. In the example  shown above, the two ends have the same number of nodes and the two sides only  differ by three nodes.
 
==Related Topics==
*[[SMS:2D Mesh Elements Menu|2D Mesh Elements Menu]]
 
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[[Category:SMS 2D Mesh|R]]

Latest revision as of 19:20, 5 June 2013

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