transient data

I want to post process time dependent output of my BEM code in paraview. Please suggest some simple and robust data format. I have tried “vtk DataFile Version 2.0” with one scale and one vector variables as cell data. Presently i simple name the time dependent output files as: out.vtk.1, out.vtk.2, out.vtk.3 …

Please suggest if there are any better ways of writing large time dependent data.

XML based .vtu file