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mesh

   'mesh' <set> ['fast'] ['block'|'lonly'|'nolength'|'noangle'|'length'|'angle']
This keyword is used to start the meshing of the model. before using the mesh command, the element types must be defined with the elty command. Existing elements will not be deleted. Therefore, its possible to start cgx in the viewing mode (-v) with a mesh alone, and then create bodies and fill them with additional elements. To delete a mesh use the command del mesh. See the command ''send'' to describe areas for boundary-conditions.

In case a blocked grid for cfd-calculations should be generated, use the additional parameter ''block'':

mesh setname block

see also the section ''Remarks Concerning Duns and Isaac''.

The mesh optimizer is controlled with the additional parameters ''nolength'' and ''noangle''. These parameters switch off length and angle optimizations of elements. The parameter ''fast'' suppresses the Nurbs-based meshing and uses the fast coons-algorithm for surface meshing.

Usually all elements are generated in a structured way. That means that no holes in a surface or volume are permitted. The only exception is the element type ''tr3u''. This type is generated in an unstructured way using the mesher from [14]. In this case, holes are permitted and a surface coming from a cad system should be meshable. Unfortunately it does not work for all possible combinations of divisions or all possible shapes of surfaces. Also, the surface MUST reference a given NURBS-surface or a shape to be meshable. This is usually the case if the data is derived from a cad-system with the interface-program (vda2fbd).


next up previous contents
Next: mids Up: Commands Previous: merg   Contents
root 2012-10-04