Hello @majidkhalil,
Yes the time step is something you need to use from the reference paper. I used a higher time step to debug the code and test it.
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It is one of the assumptions I have made since bed height is not provided either in that ref or Patil et al. I mean you can parametrically study how much the results change but using those settings I was able to get good validation.
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You can refer this thread (The User Variables output run with DMP - #3 by ChenYuan1), that is something I am not very familiar with. You can let me know if you can figure it out
Best,
Ashreet Mishra.