CFD Online Discussion Forums - time vary boundary condition to simulate waves in interFoam or equivalent

Hi all,

I am currently required to run a simulation that takes in boundary conditions that are time varying from a data file, basically with alpha1 and velocity beneath the surface of the water at every time step. Would like to find out what is the best way I can achieve this.
Generally, from many wave tank simulations we normally use groovy BC for regular waves, which we have been using for a while now: From http://openfoamwiki.net/index.php/Contrib/groovyBC

For a surface elevation following the second order stokes wave,

Code:



inlet

   {

       type            groovyBC;

       valueExpression "(pos().z<=A*cos(-w*time())+0.5*k*A*A*cos(2*(-w*time()))) ? 1 : 0";

       variables       "l=5;A=0.1;g=vector(0,0,-9.81);k=2*pi/l;w=sqrt(k*mag(g));";

       timelines       ();

   }

And for the velocity under the surface elevation,

Code:



   inlet

   {

       type            groovyBC;

       valueExpression "(pos().z<=A*cos(-w*time())+0.5*k*A*A*cos(2*(-w*time()))) ? vector( A*w*exp(k*pos().z)*cos(-w*time()), 0, A*w*exp(k*pos().z)*sin(-w*time())) : vector(0,0,0)";

       variables       "l=5;A=0.1;g=vector(0,0,-9.81);k=2*pi/l;w=sqrt(k*mag(g));";

       timelines       ();

   }

I am thus not sure in the current case how I can proceed if the parameters are irregular and known, stored in a data file of the surface elevation and velocities at the inlet boundary.

Regards.