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FEM ConstraintInitialFlowVelocity

From FreeCAD Documentation

FEM ConstraintInitialFlowVelocity

Menu location
Model → Fluid Boundary Conditions → Initial Flow Velocity Condition
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
Constraint flow velocity, Constraint initial pressure

Solvers
Elmer

Description[edit | edit source]

Creates an initial flow velocity condition for a fluid flow analysis.

The FEM initial flow velocity task panel

Usage[edit | edit source]

  1. There are several ways to invoke the command:
  2. Enter an initial flow velocity value for the analysis. The value is entered as a combination of the 3 main cartesian vectors components (X,Y,Z).
  3. Press the Add button. For a 3D analysis, select a 'solid' (body) from your model, for a 2D analysis select a face. However, it is also possible to select a face (e.g. the inlet of a pipe) in 3D or an edge in 2D. introduced in 1.1: To remove objects from the selection, press the Remove button.

Formulas[edit | edit source]

For a description how to input formulas, see section Formulas in the page for the Flow velocity constraint.

Notes[edit | edit source]

In simple analyses, it is not necessary to specify the initial flow velocity, however it is recommended as best practice.