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 prepare the input file for fastImp
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Posted - Nov 17 2022 :  16:25:47  Show Profile  Reply with Quote
Hi,I would like to ask is there any way to prepare the input file for fastImp?
I have noticed that E.M.Workbench could prepare the input file for fasthenry.But I didn't find any open source do this for fastImp.The only way I know is hand-write .inp file,but this is far too difficult for complex graphics.


529 Posts

Posted - Nov 21 2022 :  12:14:29  Show Profile  Reply with Quote
Hi Epi,

you are right, there is no support so far in the E.M.Workbench for FastImp input files. As far as I know, there is no open source software directly able to do that. As you may know, FastImp was designed to accept PATRAN-like input files, but PATRAN is not open nor so widespread as other software (actually it is a bit specialistic).

Also, you are also right about preparing the input file manually; it is complex, unless your requirement falls into one of the cases that is already supported by the basic geometries in FastImp (circular spirals, etc). The generic PATRAN input file requires a topological description, i.e. the triangular or quadrilateral panels are defined on a set of common vertexes, you may not duplicate the vertexes (so you actually know which panels are connected with which other panels thanks to the vertexes they share); plus the boundary panels (B) MUST be quadrilateral; this complicates the matter.

Now your best option here is create a script to generate the geometry and/or modify directly FastImp extending the number of geometries it can internally generate. The other option is writing some script in FreeCAD to export the geometry in PATRAN-like format, but in this case you cannot naively export the vertex locations because as said you cannot duplicate the vertexed - you must export the geometry having a certain topology.

If you are interested, we may propose an extension of the E.M.Workbench to support FastImp; for that we'd require a bit of sponsorship, if you can support us.

Thank you

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