hello, ive a problem. when i use mrf method and gridding separately, there's a layer between two. is it always like that?. check it out on http://www.geocities.com/h_saryono/S...pimnas/DPM.htm

The particles are tracked in each zone using its local relative velocity instead of absolute velocity. You can change the tracking velocity to be the absolute one using the text menu. That probably won't look quite right eigher since some particles will stop at the impeller, but that's the best you can get with MRF.