@dokken Maybe you can help me out. I have created simple square geometry in Gmsh and converted the .msh file into xdmf. When i import it in fenics using your code I’m getting different results compare to the simple command "UnitSquareMesh(30,30). I’m trying tonsolve the simple linear elastic pro…

@dokken thanks for your kind help. I really appreciate that. A little modification. I have this image domain in which i have 2 different materials the circles in domain have different material. how can I give different values of E to different domains in fenics? The applied boundary conditions are…

See How to extract and use physical labels from GMSH surfaces on FEniCS (2D mesh) - #5 by dokken and How to define different materials / importet 3D geometry (gmsh) - #2 by dokken

One question do i have to change this xdmf file? import matplotlib.pyplot as plt from dolfin import * import meshio mesh_from_file = meshio.read("mesh.msh") def create_mesh(mesh, cell_type, prune_z=False): cells = mesh.get_cells_type(cell_type) cell_data = mesh.get_cell_data("gmsh:physic…

[image] taytay33: cell_data = mesh.get_cell_data("gmsh:physical", cell_type) points = mesh.points[:, :2] if prune_z else mesh.points out_mesh = meshio.Mesh(points=points, cells={cell_type: cells}, cell_data={ "name_to_read": [cell_data]}) As long as you hav…

Let’s suppose the image given above is meshed using GMSH. The circles in images are extracted using OpenCv Contours detection. And I add physical tags to only boundary than whats the procedure to detect subdomains. In simple I use Gmsh for meshing the Image which has different domains how will fenic…

You can loop over the read in facets, find the connecting cells on each side and mark them. However, I would strongly advice you to marker the surfaces/subdomains (cell volumes) in Gmsh/your mesh generator, as it is alot more expensive to do recursive searches through neighbouring cells if you do n…

It would be amazing if you can elaborate a little bit how i can proceed in GmSh for this. I have marked the boundary only and gave the whole image an only Physical surface. As circles are in the image I can’t give them physical tag. How can we proceed in case of Images ?

I do not understand what you mean by this being an image. GMSH is a mesh generator, that has a graphical user interface where you can manually tag each subdomain. You could also do this with Python coding, see https://jsdokken.com/dolfinx-tutorial/chapter3/em.html#meshing-a-complex-structure-with-…

What I want to say is that I want to mesh a Image. The above Image is just a dummy. Actual Image doesn’t have circle. It has quite random geometry which is quite complex to define. In this way what’s the procedure for physical tags and import the mesh to Fenics with white background has different ma…

You could either: 1, Use a graphical user interface of GMSH to give each object a physical surface tag. 2. Write a recursive script looping through a. For each interface of an object find each connected cell. b. Check each connected cells loop through neighbours (going through each of their res…

How to import xdmf mesh generated by gmsh into fenics

General

dokken January 20, 2023, 5:26am 31

See for instance UMFPACK error: out of memory despite system having free memory - #2 by plugged

Topic		Replies	Views
Assigning different physical groups to different color in gmsh and mark them as different material in fenics General	34	3260	June 6, 2023
Want to import already defined physical groups of Microstructure in Gmsh to FEnics mesh mesh	40	1233	January 13, 2024
Need help converting GMSH to FEniCS installation	61	6587	September 28, 2022
How to define different materials / importet 3D geometry (gmsh)	14	5299	November 4, 2020
Extracting mesh regions for gmsh mesh mesh	24	5208	December 5, 2023

How to import xdmf mesh generated by gmsh into fenics

Related topics