how to creat particles in dieselFoam
 

I'm now running dieselFoam in openfoam2.0 according to dieselFoam tutorial. I tried to use foamtovtk and paraview to visualize Lagrangian particles, but I couldn't get any visualization in the screen after I opened the root aachenBomb_0.vtk and defaultCloud_1.vtk files. Could anybody tell me the solution? Thanks in advance!