Eddy 3-D to Paraview

I am trying to do simple wind analysis. I have an object composed of poly-surfaces that I intend to have wind flow through. I am able to run the simulation on just this object perfectly fine, but I want to put the poly surfaces in a box so that wind will flow in and out of it, and thats where I run into problems. When I try to export the simulation to Paraview I get an error message that says that the number of points/cells in the field dont match.