How to control the fully developed velocity using gradPMEAN

[dml177825934065]

Hi,
I have another question. In the 1D precursor case of 3DScour, how can I control the fully developed velocity using gradPMEAN? What is the corresponding relationship between them? If I want a flow velocity of 0.326 m/s, how should I determine the value of gradPMEAN?
I'm looking forward to your reply.

[puigmontella]

hey,
the easiest and most practical way is to use meanVelocityForce in fvOptions.

Just add this into your constant/fvOptions:

meanVelocityForce
{
    type            meanVelocityForce;
    active          true;
    selectionMode   all;
    fields          (U.b);
    Ubar            (0.326 0 0);  // Target mean velocity in x-direction
}

alternatively, if you really need to use gradPMEAN , then, unless you have a Poiseuille flow i think the better approach is to play with different gradPMEAN values in a 1D case until you get 0.326 m/s