Generating Geometry and Mesh using NURBS

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shahriar22
Posts: 1
Joined: Sun Jun 11, 2017 9:04 pm

Generating Geometry and Mesh using NURBS

Post by shahriar22 »

Hi,

I am studying Isogeometric analysis. I am wondering if we can generate geometry and mesh using NURBS?
Thank you for your suggestions
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escolano
Posts: 1918
Joined: Sun Sep 05, 1982 10:51 pm

Re: Generating Geometry and Mesh using NURBS

Post by escolano »

off course GiD uses mainly NURBS to define its curves and surfaces-
About the mesh, it doesn't has sense for iso-geometric analysis. This kind on analysis just uses the NURBS description of the geometry, with its control points as variables.
What has sense in this methods similar to meshing is to modify the NURBS geometrical description for simulation purposes (e.g. increase the amount of control points inserting knots, or increase the polynomial degree)
Both operation are possible in GiD:
Geometry->Edit->Edit NURBS->Line / surface
can select a NURBS line or surface and to the related operations of knots insertion or degree elevation (or reduction with a tolerance)

Also can force to be NURBS the expression of other entities, like straight lines, arcs or planar surfaces
Geometry->Edit->Convert to NURBS

all this geometrical data could be managed at Tcl scripting level (e.g. to write the calculation data) with our 'GiD_Geometry' Tcl command
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