Reply To: ANSYS fluent – Rocky DEM coupling

[Saeed]

Hello,

I have a question regarding the time steps in a FLUENT-ROCKY 2 way coupled simulation. the time step size of DEM is deinfed as fluent output multiplier. my fluent simulation is with 0.01 s time step and the lowest number i can go in fluent output multiplier is 1 that defines the DEM time step as 0.01 s, same as fluent. As I saw in different literature, the DEM time step size should be smaller than CFD . I tried to change the output multiplier to 0.1 but Rocky changed all the numbers below 1 , to 1 and does now allow time step smaller than fluent. Can you please help me with that? 

Thanks