If this file is in the same directory as the OpenFOAM case, then to convert the resulting. This will create the file 'bifurcating2d.msh'. The flags -clmin float and -clmax float are also useful for constraining the minimum and maximum element sizes, respectively. If the mesh is of poor quality, the flag -optimize is useful for optimising the mesh element quality. Naming this file 'bifurcation2d.geo', we can generate the mesh using the following command: Note, all physical surfaces appear in the 'boundary' file as type 'patch', so you will need to change 'topAndBottom' to type 'empty'. The expression inside the parentheses is the point's ID number the first three columns inside the braces are the x, y, z coordinates, and the 4th column denotes the prescribed mesh element size near that point. Next, we specify the grid points that define the geometry, based on the parameters above. NCells = 15 // number of cells in transverse direction L2 = 1 // Daughter channel contraction lengths

For easy modification of the geometry, it is useful to start with a definition of the relevant parameters: //. geo file using Gmsh's own scripting language, which will often be more convenient. Meshes can be created interactively using a GUI or by writing a. By Dr David Stephenson See more from this authorįollowing on from Alex's post, I'd like to demonstrate how Gmsh can be used to create a mesh for OpenFOAM, using a 2D bifurcating network as a simple example.

Gmsh boundary layer example