1. Getting started

The meshes and fields needed to make all this examples are located in the examples folder at the FEconv root directory.

In order to get a full description of the use of each FEconv option you can visit the Reference Guide.

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2. Mesh conversion

This samples shows how to convert several mesh formats supported by FEconv.

This formats are identified by the file extension, due to the overlap among some extensions this samples introduce the option -ff and the option -gm, for reading FreeFem++ and Gmsh mesh files respectively.

The option -r and the option -t must be used when reading single precission PF3 mesh files.

UNV (Universal file) mesh to VTU (Visualization Toolkit) mesh:

feconv examples/mesh.unv output.vtu

bdf (Nastran) mesh to PF3 (Cedrat Flux) mesh:

feconv examples/mesh.bdf output.pf3

MPHTXT (Comsol) mesh to MFM (Modulef Formatted Mesh) mesh:

feconv examples/mesh.mphtxt output.mfm

MSH (Ansys) mesh to UNV (Universal file) mesh:

feconv examples/ansys_mesh.msh output.unv

PF3 (Cedrat) mesh to MSH (Ansys) mesh:

feconv -r soft -t 1.e-7 examples/mesh.pf3 output.msh

MFM (Modulef Formatted File) mesh to MSH (FreeFem++) mesh:

feconv -ff examples/mesh.mfm output.msh

MSH (FreeFem++) mesh to MPHTXT (Comsol) mesh:

feconv -ff examples/freefem_mesh.msh output.mphtxt

MSH (Gmsh) mesh to MUM (Modulef Unformatted Mesh) mesh:

feconv -gm examples/gmsh_mesh.msh output.mum

MESH (FreeFeem++) mesh to MUM (Modulef Unformatted File) mesh:

feconv -ff examples/mesh.mesh output.mum
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3. Load external fields

External field files can be loaded by using option -if, this examples shows how to use this option.

This examples also use the option -r and the option -t for reading single precission PF3 mesh files.

Load MFF field:

feconv -if examples/field/nodefield1.mff examples/mesh.mfm output.unv

Load MUF field:

feconv -if examples/field/cellfield1.muf examples/mesh.mum output.unv

Load IP field:

feconv -if examples/field/cellfield1.ip examples/ansys_mesh.msh output.vtu

Load DEX field:

feconv -r soft -t 1.e-7 -if examples/field/nodefield1.dex examples/mesh.pf3 output.vtu
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4. Save external fields

The option -of allows to save external field files, you can see its behaviour in the following examples.

With the option -in user can select a single field or several fields to be readed from the source file.

Save MFM field

feconv -in nodefield1 -of examples/field/nodefield1.mff examples/mesh.vtu output.mff

Save MUF field

feconv -in nodefield2 -of examples/field/nodefield2.muf examples/mesh.vtu output.muf

Save IP field

feconv -in cellfield1 -of examples/field/cellfield1.ip examples/mesh.vtu output.msh

Save DEX field

feconv -in nodefield1 -of examples/field/nodefield1.dex examples/mesh.vtu output.pf3
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5. Change field names

By combining the option -in, for selecting input fields, with option -on user can change the field names in the destinations file.

A single field

feconv -in nodefield1 -on Temp examples/mesh.vtu output.unv

Several fields

feconv -in [nodefield1,cellfield1] -on [Temp,Press] examples/mesh.vtu output.unv
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6. Mesh transform

There are several options for mesh transformation.

  • With Option -l1 output mesh will contain Lagrange P1 finite elements.
  • With Option -l2 output mesh will contain Lagrange P2 finite elements.
  • With Option -nd output mesh will contain Whitney (edge) finite elements.
  • With Option -rt output mesh will contain Raviart-Thomas finite elements.

Transform to Lagrange P1:

feconv -l1 examples/mesh.vtu output.unv

Transform to Lagrange P2:

feconv -l2 examples/mesh.vtu output.vtu

Transform to Whitney (edge):

feconv -nd examples/mesh.vtu output.mfm

Transform to Raviart-Thomas:

feconv -rt examples/mesh.vtu output.mfm
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