FEM ConstraintPressure

From FreeCAD Documentation

FEM ConstraintPressure

Menu location
Model → Mechanical boundary conditions and loads → Pressure load
Default shortcut
Introduced in version
See also
FEM Constraint force

CalculiX, Elmer


Applies a pressure load to a face.


  1. There are several ways to invoke the command:
    • Press the Pressure load button.
    • Select the Model → Mechanical boundary conditions and loads → Pressure load option from the menu.
  2. Click on Add and select face in the 3D view.
  3. Edit appropriate window to specify pressure load in MPa.
  4. Tick box to reverse direction if necessary.


  • Distribution of the pressure on a face is always uniform and always perpendicular to the face.
  • version 0.21 and below: Pressure load can be applied to shells but only when Gmsh is used for meshing and group meshing is set to true. It is hardcoded as true so the user doesn't have to worry about that. However, due to a bug, pressure load may require remeshing to work on shells.
  • This feature uses the *DLOAD card in CalculiX.