I have completed a multiphase simulation (VOF) - Free surface type and obtained converged solution. The two phases are air and water. Now I am introducing three species in water phase within the same case setup. After defining the materials, I patched the mass fraction of species 1, 2 and 3 in all zones. I expected that the profile of mass fraction of the species to be same as that of the volume fraction of water in all grids of the mesh. But I am not getting the same profile. I request you to kindly help me out on finding the possible reason for the same.