user defined BC in oudf

[ajariwala611]

Hello Neks,

I am new to NekRS. I am trying to setup a blasius boundary layer over a flat plate case. My boundary conditions are inlet, outlet, wall, outlet, periodic, periodic for simple box grid. My question is how can I set the fixed blasius BL velocities at the inlet for every time step as a boundary condition? as I have inlet (boundaryTypeMap = v), the code looks for void velocityDirichletConditions(bcData *bc), how can I do something like this:

void velocityDirichletConditions(bcData *bc)
{
  bc->u = blasiusU();
  bc->v = blasiusV();  
  bc->w = 0.0;
}

I was able to set the initial condition using UDF_Setup() where I solve the ODE using shooting method. What would be a proper way to set those in OUDF file. More generally, how can one set a non constant userdefined velocities in OUDF file with the function evaluations? Also, is there a way to properly pass arrays between UDF and OUDF file?

Thank you for your help and support, I really appreciate it.