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Add porous objects that represent walls with a specified porosity and height.
Porous walls and polygons represent walls with a specified porosity and height that are used during the 2D simulation process. A porous wall collinear with the boundary of a 2D zone overrides the boundary condition. It is possible to set parameters for the porous wall object that results in the full or partial removal of the wall during a simulation.
This example has a selection of porous walls and porous polygons that have varying properties.
These properties can be viewed or changed in the Properties window.
This must be a value between 0 and 1, where 0 is impermeable and 1 is fully porous, meaning it has no impact on the flow. As an example, a low porosity in the range of 0.05 - 0.2 may be used to represent a building.
This is the point up to which the porosity applies—above this, there will be no effect.
For the Partially option, only faces of the wall meeting the criteria are removed. This option can be used to simulate wall collapse.
To best demonstrate the effect of these objects, in this example, a simulation is run with the porous walls and polygons included.
As the water passes through the objects, the porosity takes effect. Those with lower porosity have a higher depth building up behind them and are the first to be removed when the height threshold is reached.