# [Gmsh] Fwd: STEP to .geo conversion problem

Bernd Hahnebach gmsh at b75.ch
Mon Dec 28 18:37:09 CET 2015

```Thanks, very much for the explanation. In stuctural enigeering the
workflow is different. All constraints and the materials are defined
and saved inside the geometry.

Bernd

Zitat von Theler German Guillermo <gtheler at cites-gss.com>:

> wrong guess
>
> physical entities are sets of geometric entities designed in order
> to pass information such as materials and/or boundary conditions to
> a solver.
>
> say you have two cylinders one on top on another and you want to
> solve the heat tranfer equation. You wold then define for example
> two volumetric physical entities one for each volume and name or
> number them, and from the solver side you decide one is copper and
> one is steel. Then you would define say three surface physical
> entities, one for the upper suface, one for the lower one and one
> for the two curved surfaces and again name or number them. Then from
> the solver side yoy can say "fix the temp at 200 at upper, fix the
> temp at 100 at lower and set a convection BC at curved."
>
> hope my answer was clear.
>
> I wish I already finished some annotated examples of applications of
> a FEM solver I am writing using Gmsh-generated grids to further
> illustrate the point.
>
>
> Sent from my Samsung device
>
>
> -------- Original message --------
> From: teobo <ananim343297 at yandex.com>
> Date: 19/12/2015 03:13 (GMT-03:00)
> To: gmsh at geuz.org
> Subject: Re: [Gmsh] Fwd: STEP to .geo conversion problem
>
> Hi Bernd,
>>  What is a Physical entity?
>
> guess it is a node that is a topo point and a body point as well.
> Guess it is about double nodes and double cell edges.
> So control the clean conversion of compound step to geo - is nicer
> then cleaning up the whole doubles afterwards, if at all.
> ..
>
>
> 18.12.2015, 22:06, "Bernd Hahnebach" <gmsh at b75.ch>:
>>>   Hello. It would be nice to be able to define the Physical entities in
>>>   FreeCAD and have them recognized by Gmsh, but I don't know how
>>> to do that.
>
>>>   What I do from FreeCAD is export each physical surface as a separate BRep
>>>   file and merge them in Gmsh and define the contained volume there. Not
>>>   ideal, but this works.
> He, he I like juggling faces. But do not really understand the
> advantage over just exporting merged compounds?
>
> Regards
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