[Gmsh] Fwd: STEP to .geo conversion problem

[Theler German Guillermo]

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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