DPM - linear divergence???

Sebastian Graulich

Hello,

I am simulating an evaporating multiphase particle travelling through a tube with a simple laminar poiseuille flow. There are several other species in the sourrounding fluid which do not react with the particle. Now, everytime I decrease my timestep of one order of magnitude, my solution (the mass fraction of the evaporated species in the flow) also decreases about one order of magnitude. This is pretty much independent of the grid resolution I use. I just can't figure out what is happening. Does someone have any ideas??

Thanks Sebastian G.