Velocity damping

Table of Contents

This constraint is primarily used to dampen velocity fluctuations in the start-up phase of simulations. When the local velocity exceeds the user-supplied maximum value a sink term is activated in the affected region to lower the velocity to the limiting value.

Properties

Additional reporting is provided for the number of cells being damped, and as a percentage of cells over the complete mesh.

Note
When active, this constraint manipulates the system of equations. Users should ensure that it is not active when the case is converged (steady-state) or during the period of interest (transient) to ensure that its presence does not pollute the results.

Usage

velocityDamping
{
    type            velocityDampingConstraint;
    selectionMode   all;
    UMax            200;
}

Further information

Tutorials

  • none

Source code

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