open TELEMAC-MASCARET The mathematically superior suite of solvers

As part of my modelling in an area at risk of flooding, buildings are to be constructed on supports.
In order to illustrate the effects of these buildings and supports, I first modelled the actual state.
Then I modelled the planned state. To do this, I adjusted the terrain accordingly. I modelled the supports by cutting them out of the mesh.

Then I thought about whether there was another way to represent the columns in the mesh.
So I thought about setting the surface of the columns with an almost infinitely high roughness. The value is 0.001 as Kst value for the domain itself I setted a value of 45 (LAW OF BOTTOM FRICTION=3).

Below is the result as a picture. You can already see clear differences in the water depth and also in the flow velocity.

My question:
Is the method of representing buildings or non-overflowing objects with an almost infinitely high roughness in the mesh at all permissible and does it provide representative data? How does the programme calculate in this respect?
Or does cutting out the non-overflowing objects from the mesh provide the best, most representative, realistic results?


Maybe someone can answer these questions for me
Thanks in advance
:)

Hi
The solution which deals with friction, drag forces, porosity are potential solution if the main interest is not in the specific flow in this area as these solution are a kind of downgraded solution used to avoid high mesh refinement due to buildings.
By the way, each solution is possible but need to be adapted to the problem.
The solution of infinitely high roughness could be a solution but you need to apply the friction at the right place...
And you should think of the potential problem of volume of water...
So represent buildings is the most accurate solution but it has a cost (computation ...) so other solution could be used, with caution and need to be well calibrate.

Hope this helps

Hey and thanks for the really quick answer it helped me a lot!