Export corrected velocity field data

Hi,

My model is a simple single phase fluid flow with the laminar flow module. I need to export the corrected velocities that hold the divergence-free condition. I checked with the solution and calculated the divergence with the first derivatives: ux, vy, and wz and the divergence is not zero. In the dependent variables the corrected velocities are listed as ucx, ucy and ucz. When exporting data I list those three and the error is: 'Failed to evaluate variable: ucx'.

I also tried using spf.ucx but it fails to export the data.

Or does COMSOL guarantees divergence free solutions?

Thank you.