Thank you so much for your patience and I indeed was able to generate the
separate msh files.
To generate the mesh over sphere:
I imported the sphere.geo file and clicked on "3D" in Mesh module. Then I
refined the mesh by "Refine by Splitting". When I saved the mesh file, it is
indeed the mesh for the sphere inside(sphere.msh), which exactly what I wanted
for the sphere.
To generate the mesh over the whole cube:
I repeated the same steps for box.geo, I got the mesh for the whole
cube(box.msh) including the sphere.
(1) What needs to be done to guarantee that sphere.msh is
identical(conforming) to the portion of box.msh that accounts for the
sphere? Or am I missing something again in your idea to extract the
sphere.msh portion directly from box.msh?
(2) If I need to generate a third portion of the box.msh that accounts for
the volume= cube/sphere( sphere subtracted from the cube), do I need to create
cube/sphere.geo and insert geomtry.geo into it as you have shown me or it is
just the volume(2) you had in your last reply, that is:
Volume(1) = {1}; // the sphere
Volume(2) = {1, 2}; // outside the sphere
Thank you very much for your kindness and willing to walk me through this. I
appreciated it.
Best,
Abiti Adili
________________________________________
From: G. D. McBain <[email protected]>
Sent: Monday, November 19, 2018 5:34:17 PM
To: Abiti Adili
Cc: gmsh
Subject: Re: [Gmsh] saving the mesh for a subdomain separately
�\�\�\�\�\�\�\ Original Message �\�\�\�\�\�\�\
Le mardi, novembre 20, 2018 10:07 AM, Abiti Adili <[email protected]> a écrit :
> Thank you very much for your time.
You're welcome.
> I am a quite a beginner in Gmsh and I am grateful for your kind reply. I
> would appreciate it if I could ask the following questions.
Do remember to 'reply all' so that the conversation remains on the list for all
to see.
> (1) Does that mean I have to define a physical volume for the sphere as well?
Yes.
> (2) I might not have understood what you meant and I am a little bit confused
> about the idea of including the whole .geo file into the scripts that define
> the subdomain.
"Include" is a keyword in the Gmsh GEO file syntax; see
http://gmsh.info/doc/texinfo/gmsh.html#index-Include-char_002dexpression_003b
The idea is to have something like the "sphere.geo" attached. In full, it is:
Include "geometry.geo";
Physical Volume("sphere") = {1};
And then similarly for the box.
> If I assume the .geo file I included in my last email is geometry.geo and it
> creates cube with a sphere in it. Would it be possible for you to give a bit
> more elaboration on how the idea of splitting and syntax of inclusion achieve
> the mesh for my desired subdomain?
Sure. See attached. Actually I missed a couple of defects in the original
GEO code:
* The Volume defined there is the whole box, and hasn't had the sphere
subtracted. It should read
Volume(1) = {1}; // the sphere
Volume(2) = {1, 2}; // outside the sphere
* Don't define any physical entities in the common geometry.geo file.
These are rectified in the attached geometry.geo.
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