Generate an input mesh
EGS_Mesh simulations have three steps:
- Create an input mesh file for your geometry
- Write an
egsinpfile for your simulation - Run the simulation and view the results
For this example, you're going to simulate a cube of water. The cube will have side lengths of 10cm for a total volume of 1000 cm³.
Creating the geometry using Gmsh
In this example, you'll create the geometry in Gmsh and then mesh it. It's also possible to define your geometry in CAD, export it to STEP, and then use Gmsh to mesh the STEP file.
First, open Gmsh. Create a new script file using File->New called cube.geo. If prompted, use the OpenCASCADE geometry kernel. Create a 10cm cube using:
Geometry->Elementary entities->Add->Box
After adding the box, hit the q key to quit the box dialog. Gmsh is unitless, so a length of 10 could have any unit attached. By default, EGS_Mesh assumes mesh files are given in cm.
Assigning mesh media
You've made a cube. But how will EGSnrc know it's water? You also have to assign EGSnrc media names to each volume. Media names are specified using Gmsh Physical Volumes. Open the Physical Volumes dialog using:
Geometry->Physical groups->Add->Volume
In the Name input, enter H2O for water. Select the volume using the mouse, and the yellow sphere at the center of the cube should turn red. End the selection by pressing the e key, and then hit the q key to exit the volume dialog entirely.
Meshing the geometry
Now, you have a geometry with media names attached. All that's left is to mesh it. Generate a 3D mesh using:
Mesh->3D
After meshing, you can find information like the number of tetrahedrons using Tools->Statistics. The mesh shown here has 1153 elements. Mesh visibility settings are in Tools->Options->Mesh->Visibility.
Write the mesh to disk using:
File->Save Mesh
Only ASCII v4.1 msh files are currently supported in EGS_Mesh. You can open up the file in a text editor to check the details:
$MeshFormat
4.1 0 8
$EndMeshFormat
$PhysicalNames
1
3 1 "H2O"
$EndPhysicalNames
... // continued
Here, the format version is confirmed to be 4.1, and the only media name is H2O. Further on in the file, node coordinates and element nodes are also stored. The msh format is documented here.
With a fresh mesh file in hand, you're ready to write an EGSnrc input file.
Scripting in Gmsh
If GUIs aren't your thing, Gmsh also has a scripting interface. Every action in the GUI is written to a project script file, which can be edited and reloaded on the fly.
The script for this session looks like:
SetFactory("OpenCASCADE");
Box(1) = {0, 0, 0, 10, 10, 10};
Physical Volume("H2O") = {1};
You can edit the script using Geometry->Edit script. After you make changes and save, reload it with Geometry->Reload script. Gmsh also provides language bindings for Python, C++, Julia and C, but this requires installing the Gmsh Software Development Kit.
Going further
-
Try meshing another geometry, like a
Torus. -
There are a few ways to generate a more refined mesh. One way is to adjust the maximum element size (
Tools->Options->Mesh->General->Max element size). Try obtaining a mesh with roughly 50,000 elements by varying the maximum element size. Before remeshing, hit the0key to reset the old mesh. If you need to refine just a few mesh areas, check out the Gmsh documentation on size fields. -
Change the meshing algorithm using
Tools->Options->Mesh->3D algorithmand remesh. Do you observe any difference in the generated mesh? For complex models, sometimes one algorithm succeeds where another fails.
Note: the full mesh file is saved below. You can copy the contents to a file using the copy button on the top right and continue the walkthrough if there were any issues generating the mesh yourself.
cube.msh file
$MeshFormat
4.1 0 8
$EndMeshFormat
$PhysicalNames
1
3 1 "H2O"
$EndPhysicalNames
$Entities
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6 -1.000000002804313e-007 -1.000000002804313e-007 9.999999900000001 10.0000001 10.0000001 10.0000001 0 4 2 12 -6 -10
1 -1.000000002804313e-007 -1.000000002804313e-007 -1.000000002804313e-007 10.0000001 10.0000001 10.0000001 1 1 6 1 2 3 4 5 6
$EndEntities
$Nodes
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