[haideralshami]

hi friends ,iam try to solve this problem (particle deposition)in wall or floor but i want to try ,how to began when inlet airflow (indoor)then work by deposition of particle and use lagrangian model ,turbelant model (k-e),thank for any helping

[ghorrocks]

There is a CFX tutorial example which is very similar to this, it uses lagrangian particle tracking to work out particle erosion on a valve. You can get the tutorials from the ANSYS customer website.