solution methods
 

what is the difference in the solution methods between SIMPLE and COUPLED scheme? (i dont know what to choose so i use SIMPLE)

especially in DPM modle.

thanks

SIMPLE algorthim is used to deal with model of different flow regimes such as laminar and turbulent flow in same case . Coupled is used instead of segregated and solve equations simultaneously

thanks!
but still i dont understand what coupled use for.... (exp: in DPM?)

SIMPLE solves velocity and pressure in separate steps while coupled solves both simultaneously. Generally coupled will converge in fewer iterations, but each iteration will take more time. Sometimes for problems that are very difficult to converge, the coupled solver can help.