[BMachno]

Dear REEF3D Team,

First of all, thank you for your amazing software; it is just great. You are doing a great job!

Secondly, I am kindly asking for your advice with the following problem:
I want to calculate a score around a cylinder which is in contact with a bed. Please, see the Figure 1. Here I met the following problem: because the cylinder is in contact with the bed, firstly, bed are partially in the body (Figure 2), and, secondly, here are zero velocities around the cylinder because the bed is impermeable. Thus, there is no scour under the cylinder as it is expected.

In order to solve this task, I think that it is possible to use the VRANS porous media (S10 2 and B270). I tried to implement this scenario (Figure 3); however, there is no hill after the cylinder.

Therefore, am I on the right way or should I use something else?

Thank you for your attention in advance!

P.S. I also attach my current model in control.txt and ctrl.txt.
P.S.S. I use REEF3D 23.03 and DiveMESH 23.03.

[valgrinda]

In order for pipeline scour to work with the current sediment transport algorithm, you need to start with e>0. With the traditional bedload/Exner formulations, there is not direct solution to the initiation of scour for buried pipelines.

[BMachno]

Dear Mr. Bihs,

Thank you for your reply!

May I clarify some points?
1) What does e>0 mean? Is it a distance between the bed and the body?
2) Can you advice me some model which is capable to solve this type of problems?
3) Are you going to implement some model which is capable to solve this type of problems?

Thank you for your attention in advance!

[valgrinda]

1) yes, exactly.
2) no really sure, anything particle based should be a starting point. Modifying REEF3D's VRANS approach would also be a good possibility.
3) yes, working on it (particle based transport) but may take some time.

[Felix_Sp]

Hello,

In SedFOAM they simulated your problem However it is no three-phase model. They just applied an oscillating velocity as boundary condition. There is also a tutorial on that.

Cheers

[valgrinda]

Yes, that is possible to do, but it circumvents the actual physics at hand.

[BMachno]

Dear All,

Thank you for your advice and suggestions.

I am going to work on this problem by reviewing available models and software.
If I find something useful, I will post it here in case if somebody need it.