Difference between revisions of "HowTo Import a fluent mesh with interfaces"

Revision as of 15:33, 15 March 2007

1 Purpose

The purpose of this short HowTo is to explain the few steps that are necessary in order to read a fluent mesh that contains interfaces. Valid versions:

2 How is it done

A mesh with an interface is a mesh containing two overlapping surfaces that do not necessary share the same discretization nodes, as seen in Figure 1.

Figure 1 Non-conformal mesh

To convert such a mesh, just use fluentMeshToFoam utility. Let consider the current case, where an "inlet", an "outlet" and two interface "interface_coarse" and "interface_fine" boundaries are defined. The rest of the boundaries are considered walls.

fluentMeshToFoam ./ test_interfaces test_interface/geometry/test_interface.msh

Once imported, the mesh consists of actually two separated volumes, by the interface_fine and interface_coarse surfaces. The second step is to stitch the meshes by spliting the faces of the two interfaces creating polyhedral cells:

stitchMesh ./ test_interfaces interface_fine interface_coarse

Now the mesh looks something like in Figure 2.

Figure 2 Stiched mesh

The utility will preserve also the original patches as boundaries, but since they are no longer needed, they can be safely deleted from the polyMesh/boundary file.

3 Download

The sources of the test case can be downloaded from: [test_interfaces]

@@ Line 7: / Line 7: @@
 To convert such a mesh, just use fluentMeshToFoam utility. Let consider the current [[Media:test_interface.tgz|case]], where an "inlet", an "outlet" and two interface "interface_coarse" and "interface_fine" boundaries are defined. The rest of the boundaries are considered walls.
 <div align=center>
-'''fluentMeshToFoam ./ test_interfaces test_interface/geometry/test_interface.msh'''
+ fluentMeshToFoam ./ test_interfaces test_interface/geometry/test_interface.msh
 </div>
 Once imported, the mesh consists of actually two separated volumes, by the interface_fine and interface_coarse surfaces.
 The second step is to stitch the meshes by spliting the faces of the two interfaces creating polyhedral cells:
 <div align=center>
-'''stitchMesh ./ test_interfaces interface_fine interface_coarse'''
+ stitchMesh ./ test_interfaces interface_fine interface_coarse
 </div>
 Now the mesh looks something like in Figure 2. [[Image:interface_drg1.png|thumbnail|Figure 2 Stiched mesh]]