Hi Ali, Geometry definition and meshing are different processes, and Gmsh is rather a meshing tool. That said, it has quite reach tools for geometry definition. They are weaker than in mid-size CAD program though. So, if you have a more or less simple model - you can use Gmsh for both geometry definition and mesh building. For complex models one can use a third-party CAD software to define a geometry, and then use Gmsh only for meshing. That's why I supposed that the first model with spherical grains could be modelled in Gmsh, whereas the second one - with grains of complicated shapes - couldn't.
As for your second question - if you don't want to save the mesh inside the circles (but the mesh will be built), comment the line describing the corresponding volumes as "physical": Physical Volume (t) = thehole ; If you don't want the mesh in the circles be even built, comment the line (as well as the previously mentioned one): Volume(thehole) = theloops[t] ; Best, Mikhail On Sun, Jul 27, 2014 at 3:35 AM, Ali Nasab <nrdp...@gmail.com> wrote: > Hi Mikhail, > > Thank you for following up my question. > I am a bit confused here. You mentioned that "Gmsh can build meshes for > both cases". You, then stated that " For the second model - I honestly > think that you'll not be able to define such a geometry in Gmsh". Can you > please clarify about this sentence? Can I use Gmsh for the second case or > not? > I am not sure which one is case 1 or 2. > > The t5.geo is a good example. In this example, the mesh is created for all > of the shapes. Now, can I exclude the circles from the mesh (no mesh inside > the circles)? > > Regards, > Ali > > > > > On Sat, Jul 26, 2014 at 6:22 PM, Mikhail Artemyev < > artemiev.mikh...@gmail.com> wrote: > >> Hi Ali, >> >> Gmsh can build meshes for both cases. For the first model you will be >> even able to define a geometry with Gmsh - look at t5.geo tutorial for >> example. For the second model - I honestly think that you'll not be able to >> define such a geometry in Gmsh, so you'll need to use some CAD tool (best >> of all - based on OpenCascade) and import the model from it into Gmsh in >> STEP or BRep format. >> >> Best, >> Mikhail >> >> >> >>> >>> ??Dear Professor Geuzaine, >>> >>> ?I am a research scientist collaborating with NJIT. We are planning to >>> develop a code to conduct simulations of water flow in pore scale. The >>> first figure below, represents the porous media. In this figure you can >>> see >>> the grain phase in red circles and the void space in white (and black) >>> color. >>> >>> [image: Inline image 1] >>> >>> ? >>> ?I need to be able to create the 3D mesh for 1) only the void space >>> (ignoring the grain phase) and 2) both the grain phase and the void space >>> like the image below (grain phase is in light blue and void space in >>> green). ? >>> >>> >>> [image: Inline image 2] >>> >>> >>> ?Please let me know if Gmsh is suitable for our purpose. >>> Please let me know if you need further clarifications. >>> >>> ?Regards,? >>> >>> >> > > > -- > Ali Abdollahi-Nasab, PhD > Center for Natural Resources Development and Protection > Department of Civil and Environmental Engineering > Newark College of Engineering > The New Jersey Institute of Technology > 323 MLK Blvd, Newark, NJ 07102 > Ph: 267-237-2302 > Email: nrdp...@gmail.com > http://nrdp.njit.edu >
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