User Forum of Software BASEMENT

Matteo Facchini

Developer

From: Trento

Registered: 2014-09-05

Posts: 278

Very high velocities at boundary

I would like to post something that I discovered in these days, just to share it with the community and maybe get some feedbacks.

I was running a simulation with a very steep boundary condition (10%) and I noticed very high (unrealistic) values of flow velocities in the flood_tracking_v output.

After some reasoning and tests, I realized that the problem was linked to:

• dry initial conditions

• minimum water depth

Changing the initial conditions to continue or region defined solved the problem.

What I realized is that starting from dry initial conditions, in the first time steps the water depth was increasing but it was still below the minimum water depth, so there was no flux from the first cells to the rest of the domain. In one time step the water increased from far below (1.7E-4 m) to far above (0.5 m) the minimum water depth (0.05 m). This was caused something like a dam break, I suppose, hence the high velocity values.

Do you think I came to the right conclusion, or could it be something else?

Last edited by Matteo Facchini (2023-04-18 13:39:17)