mesh
Keywords: cgx

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mesh

       'mesh' <set> ['fast' |& 'block' |& 'nolength' |& 'noangle']

This keyword is used to start the meshing of the model. The element types must be defined before with the command elty. Already existing elements will not automatically be deleted. Therefore its possible to start cgx in the viewing mode (-v) with a mesh alone, then to create bodies and fill them with additional elements. To delete a mesh use the command del mesh. See also 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''. This 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 [13]. In this case holes are permitted and a surface comming from a cad system should be meshable. But unfortunatelly it does not work for all possible combinations of divisions or all possible shapes of surfaces so far. Also the surface MUST reference a given NURBS-surface to be meshable. This is usually the case if the data are derived from a cad-system with the interface-programs (vda2fbd).

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