[baghfay]

Dear all

when defining injection for DPM calculation and activating the Discrete random walk model a time scale constant will be required

i noticed that increasing this number will increase the erosion rate and this may be explained by that the particles will have more time in the domain so more compacts and hence more erosion(at least my understanding)

in Fluent theory guide it was mentioned that for K-e models a value of 0.15 is recommended while a value of 0.3 is recommended for RMS model

i want to know what is the basis of this values and during real simulation how can we choose best value for our model or geometry

is this constant geometry dependent if so how can we estimate it

if any has a good reference to read besides the fluent manual please share with me

Regards