[Steeve]

Hello everyone,
I am trying to simulate numerically the local scouring process caused by waves around a monopile foundation using REEF3D.

When the wave height is increased, the sediment data disappears as shown in the attached image.
In the calculations in the image, the wave height is set to 0.1065, but when the wave height was 0.071, the calculations were successful. (It seems that the calculation crashes when the amount of scour is too large.)
What parameter needs to be changed in such a case?
I am attaching an image of the calculation results and the command file.

Thank you.

[harenaobsidet]

Hello Steeve,
When did your simulation crash sim time and iteration?
What is your crash reason?
Did you use the latest version?

[Steeve]

Thank you for your reply.

Scour decreases after 5500s sediment time and finally the sediment layer disappears.
The sediment data is lost, but the calculation itself does not stop (not crash). I apologize for the confusing sentence.
As for the version of the analysis, I used the version of 2022 because I found that there was almost no scouring when using the latest version under different conditions.
I will try to recalculate with the latest version.

[harenaobsidet]

Could you check what color NaN is set to in your ParaView?
It looks a bit like there could have been an NaN eating away at the topo. However, all NaNs that would result in something like this, that I have encountered so far, have also crashed the fluid sim.

Could you also post the console log between the "good" printout and the "bad" one if you still have it?

[Steeve]

Sorry for the late reply.

I am currently recalculating with the new version, and the calculation is more advanced than when the topo data disappeared, and the desired scour trend has been obtained.
I think it is probably not a problem with the Nan setting in paraview, because the topo data is not disappearing even though the scour is more advanced than before.

Is it still a problem due to an old version? If you know anything about this, I would appreciate it if you could let me know.
I will ask again if I have any more problems.
Thank you very much for your help.

[harenaobsidet]

Originally Posted by Steeve

I am currently recalculating with the new version, and the calculation is more advanced than when the topo data disappeared, and the desired scour trend has been obtained.

So it is working now as you were expecting – sufficient scour development and no disappearing topography?

Originally Posted by Steeve

I think it is probably not a problem with the Nan setting in paraview, because the topo data is not disappearing even though the scour is more advanced than before.

I asked about NaN because what you see in ParaView as topo should be a continuous function in the entire domain giving the distance to the water/topography interface. So when you have extreme scour there might be a hole, but that hole would have walls extending to the bottom of the domain and your picture just shows a missing section.

Originally Posted by Steeve

Is it still a problem due to an old version?

That could very well be. The models are continuously updated and I remember us fixing a few problems in the sediment module last year.

[ajayjatoliya]

Hello Steev,

I saw you control file. If you are calculating the scour due to waves only, then why you are giving discharge using the parameter W 10 ?

[Steeve]

So it is working now as you were expecting – sufficient scour development and no disappearing topography?

>> Yes, the sediment didn't disappear and the scour could be reproduced.

[Steeve]

Originally Posted by ajayjatoliya

Hello Steev,

I saw you control file. If you are calculating the scour due to waves only, then why you are giving discharge using the parameter W 10 ?

Hello,

I used the commands in the original file that I was referring to when I created the command file.
These commands were not necessary when targeting wave scour.
Thank you very much for your comments.