![]() ![]() ![]() I get the “Assertion fail : (area > 0)” error message. When I try to plot the mesh in FF++ with load "gmsh" The shape to be meshed will be created by specifying points and then connecting. For the MSH Options I selected Version 2 ASCII and I unchecked “Save all elements” and “Save parametric coordinates”. The first step in creating a mesh is to create some shape that will be meshed. msh file I use: File->Export-> Test.msh file. I am trying to import a 2D mesh from GMSH 4.9.3 (Windows version) to FF++ v. I’m thinking that probably the most satisfying solution would be to suggest to gmsh developers to allow directly exportation under freefem. Overall, I see a solution for what I expected to do, but the facts that (i) the solution relies on a legacy format, (ii) gmshload is not documented in the freefem doc and (iii) there is no example using this in the freefem repository make me fear that the solution may not be perennal… Importing the mesh seems to work but plotting crashes. On the other hand, I was not able to succeed with more complicated geometries such as the “t4.geo” from the gmsh tutorial.Assigning labels effectively works using the solution given in this thread.Works for simple geometries (such as example t1.geo), using gmsh-format version 2 ascii (version 4 and INRIA format don’t work).I spent some time doing a number of elementary tests, starting from the examples in the gmsh tutorial directory. Thanks for the tip Aszaboa ! indeed it works this way. I meshed with an element size factor of 50 in both cases.Ĥ.7.1, all elements => correct mesh, incorrect labelsĤ.7.1, unselect all elements => incorrect mesh, presumably correct labels.ĭoes anyone know how to get both a correct mesh and the correct labels? No matter whether you select to ignore physical groups or not, the mesh is correct but the labels are not. If you don’t save all elements you get an incorrect mesh but (presumably) correct labels. If you save all elements you get a correct mesh, but incorrect labels. If you want to reproduce this, here is the. The outside mesh is red, while the inside mesh is orange, and I couldn’t figure out what it means. On the other hand, what should be a hole in the mesh is now meshed, too. uploading the mesh into freefem and asking for its labels returns 3 labels). It looks like it’s almost working in 4.7.1 (i.e. geo file, the Extrude statement must be modified to have a single layer, and then should be recombined.An update: there’s a difference between using gmsh 2.7.1 and 4.7.1. For example (the numbers may be different):ħ. You can also assign internal surfaces to physical surfaces to make internal walls in the geometry. Rename the Physical Surfaces to the names that will be used in OpenFOAM as the boundary names. geo file automatically, but if not, save it now. Select Physical Groups->Add->Volume from Geometry and select the volume.Ħ. The volume of the geometry must also be named. Later the names will be changed from a number to “bottom”, “left”, “top”, etc. For example, if the shape is a square, select the bottom, left, top, right, front, and back faces and individually add them as a Physical Group (If your boundary consists of multiple faces, you can select them together and then add the Physical Group). Remember the order of the boundaries, as the GMSH GUI will label them with numbers that later need to be changed to a text name for OpenFOAM. To define a boundary, go to Physical Groups->Add->Surface from Geometry and add each surface that will be a boundary. Now that the shape is 3D, the boundaries can be defined. The distance and direction of the extension is defined under the Contextual Geometry Definitions window that appears, under the Translate tab.Ĥ. This will extend the surface into 3D space. Select Surface, then click the surface in the viewer. Extrude the final surface into 3D by selecting Elementary entities->Extrude->Translate under the Geometry menu. These can all be done from the Geometry Menu under Elementary entities->Add->New.ģ. ![]() In a single plane (2D), create the geometry by first creating all points, then combining the points into lines, and then the lines into a surface. 1.1 Graphical User Interface (GUI) and *.geo-modificationġ Defining the Geometry and Mesh in GMSH 1.1 Graphical User Interface (GUI) and *.geo-modificationĢ.1 Defining the Geometry and Mesh in GMSH. ![]()
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