[Unharuka]

Hello everyone,

I want to do the scour simulation in wave conditions using FLOW-3D, however, the water level drops quickly when I open the scour model. It won't drop when I don't use scour model.

The water level dropping is also happened in the simulation of currents, and it can be sloved by setting the Xmax boundary condition as specified pressure.

So maybe scour model will effect the mass conservation of water, however I can't set the Xmax boundary condition as specified pressure in wave conditions because it need to be an outflow condition for wave absorbing. I have no idea and choices to ask this question.

Thank you very much!

[Flow Science Australasia]

You can try setting the Xmax to a specified pressure, then add the wave absorbing component in the geometry instead of using it as part of the outflow boundary condition (see attached image for setting the wave absorbing geometry type).

[Unharuka]

Originally Posted by Flow Science Australasia

You can try setting the Xmax to a specified pressure, then add the wave absorbing component in the geometry instead of using it as part of the outflow boundary condition (see attached image for setting the wave absorbing geometry type).

Thanks for your warm reply! This problem is sloved as your said. Thank you very much! And it has a good agreement with theoretical value though not using outflow boundary condition.

But another problem occurred, when I tested the stabilization of wave simulation that the time step went increasingly smaller, finally nearly smaller than 0.0001s(please see the attachment). It confused me for a long time and this time I don't get any clues about this problem. My wave height is 0.12m, wave period is 1.42s, mean depth is 0.4m in 5th stokes wave.

I will be very appreciated if you could give me any help! Thanks!