CFD Online Discussion Forums - groovy BC time dependent outlet velocity (easy)

Hi FOAMers

I implemented a time-dependent velocity condition at a boundary. From the /U directory, it looks like this

Code:

    outlet

    {

        type groovyBC;

        valueExpression "vector(0,Um*time(),0)";

        variables "Um=100;ome=2*pi/5.5;";

        timelines ();

        value uniform (0 -1 0);

    }

A few questions: what does the vaue uniform (0 -1 0) mean?

This code takes significantly longer than if I use a standard outlet condition of uniform speed -1 (not time dependent). I think the code would run faster if instead of using each timestep I instead used every nth timestep. How can I do this?

EDIT: Actually, nevermind, I think I'll go in a complete different direction here. Don't know how to delete post?