[Gmsh] Create mesh for 1D geometry

[Max Orok]

I'm not sure dwg or dwf is supported, but I know you can import STEP, IGES
or BREP.

If it's just the one geometry I think you could manually specify it like we
did for a single line, but make sure that
the lines are connected at those points.


On Fri, Feb 7, 2020 at 8:04 AM Deepa <deepamahm.iisc at gmail.com> wrote:

> Hi Max,
>
> Thanks a lot. It works like a charm!
>
> I'd like to know if it is possible to create NASTRAN bulk data file for
> geometries like the following
>
> [image: Untitled.png]
>
> I have the geometry in  dwg and dxf file format created from AutoCAD.
> Basically, I have specified coordinate positions to create points at every
> delx= say,0.5 in CAD.
>
> Many thanks,
> Deepa
>
> On Fri, Feb 7, 2020 at 1:52 AM Max Orok <morok at mevex.com> wrote:
>
>> Using the python api, building on Jeremy's nice example, but omitting
>> physical groups:
>>
>> -----
>> import gmsh
>>
>> delx = 0.5
>> xend = 20
>>
>> gmsh.initialize()
>>
>> point_a = gmsh.model.geo.addPoint(0.0, 0.0, 0.0, meshSize=delx)
>> point_b = gmsh.model.geo.addPoint(20.0, 0.0, 0.0, meshSize=delx)
>>
>> line = gmsh.model.geo.addLine(point_a, point_b)
>>
>> gmsh.model.geo.synchronize()
>>
>> # make a 1d mesh
>> gmsh.model.mesh.generate(1)
>>
>> # save the mesh as a NASTRAN bulk data file
>> gmsh.write("line.bdf")
>>
>> gmsh.finalize()
>> -----
>>
>> Sincerely,
>> Max
>>
>> On Thu, Feb 6, 2020 at 1:25 PM Jeremy Theler <jeremy at seamplex.com> wrote:
>>
>>> delx = 0.5;
>>> xend = 20;
>>> Point(1) = {0, 0, 0, delx};
>>> Point(2) = {xend, 0, 0, delx};
>>>
>>> Line(1) = {1, 2};
>>>
>>> Physical Point("left") = {1};
>>> Physical Point("right") = {2};
>>> Physical Line("bulk") = {1};
>>>
>>> On Thu, 2020-02-06 at 23:11 +0530, Deepa wrote:
>>> > >
>>> > > I am a beginner here.
>>> > >
>>> > > I'm looking for ways of creating a mesh for a 2D geometry. It's a
>>> > > straight line, the nodes have to be positioned along the x
>>> > > directions and all y-coordinates have to be zero.
>>> > >
>>> > > Example: 0 : delx : xend, where delx =0.5, xend = 20.
>>> > >
>>> > > I have to create the input file in a format that will be compatible
>>> > > for importing in COMSOL.
>>> > >
>>> > > Any suggestions on how to proceed will be really helpful
>>> > >
>>> > > Thanks,
>>> > > Deepa
>>> > >
>>> > >
>>> >
>>> > _______________________________________________
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>>> > gmsh at onelab.info
>>> >
>>> > http://onelab.info/mailman/listinfo/gmsh
>>> >
>>> >
>>>
>>>
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>>
>>
>> --
>> Max Orok
>> Contractor
>> www.mevex.com
>>
>>
>>

-- 
Max Orok
Contractor
www.mevex.com
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