[GeZi]

Dear REEF3D Team,

Thank you for your amazing software！I am simulating a single pier scouring experiment, extracting the scouring results of simtime=3600s in REEF3D for comparison, and found that REEF3D has never reached the scour equilibrium state, what are the problems with my parameter settings?

ps.REEF3D v23.03 DiveMESH v23.03

[valgrinda]

The scour depths are slightly over predicted for the later stages of the simulations - but only slightly so.

Regarding equilibrium: from the graph it is clear that the experiment also never reaches the equilibrium state within t/T=1. The 2005 numerical data follows a different trend than the experiments. Your results actually follow the trend of the experimental data. (assuming that the experimental data points are set correctly)

[GeZi]

Originally Posted by valgrinda

The scour depths are slightly over predicted for the later stages of the simulations - but only slightly so.

Regarding equilibrium: from the graph it is clear that the experiment also never reaches the equilibrium state within t/T=1. The 2005 numerical data follows a different trend than the experiments. Your results actually follow the trend of the experimental data. (assuming that the experimental data points are set correctly)

In the numerical simulations of Roulund et al. (2005), the equilibrium state was almost reached after 1h, and his experiment also reached equilibrium at about 3h. I simulated a total of 5400s, but the scouring depth has always increased, and it has never reached equilibrium. The figure below is Roulund's scour time history upstream of the pile. So, I want to know what is wrong with my "ctrl.txt" file to help me reach the scour equilibrium state.

[valgrinda]

Looking at the experimental data, the equilibrium state is not reached at 5400s. Upstream, maximum scour depth is reached somewhere between 7200s and 10800s. Although looking at the Fig. 34 b) for the downstream scour depth, the scour continues to develop past 10800s. So in the end, your simulation results are not unreasonable.

Keep in mind, the sediment transport algorithm depends on many parameters and is very complex. Small changes in parametrization will change the outcome quite a bit.