FEM ConstraintInitialFlowVelocity

    From FreeCAD Documentation

    FEM ConstraintInitialFlowVelocity.svg FEM ConstraintInitialFlowVelocity

    Menu location
    Model → Fluid Constraints → Constraint initial flow velocity
    Default shortcut
    Introduced in version
    See also
    Constraint flow velocity, Constraint initial pressure


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


    1. Either press the toolbar button FEM ConstraintInitialFlowVelocity.svg FEM ConstraintInitialFlowVelocity or select the menu Model → Fluid Constraints → FEM ConstraintInitialFlowVelocity.svg Constraint initial flow velocity.
    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. 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.


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


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