TUFLOW 1D2D SX Advice: Difference between revisions
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* The 1D/2D link associated with the 1m 2D cell size is not stable.
* The flow rate results through the 1D culvert decrease with cell size. This is an issue. It indicates cell size convergence (i.e. consistent results independent of cell size) was not achieved. This is caused by the 2D storage volume associated with the 1D/2D connection being insufficient compared to the flow area associated with the 1D channel (12m width). As a result, the 2D boundary cell is the model feature limiting flow exchange between the 1D and 2D, rather than the dimension and hydraulics associated with the 1D structure.
''Please note that the connection of the culvert to only one 2D cell is provided here as an example. It is not recommended to use less 2D cell width (width required across the culvert face) than in the linked culverts. For example, a 12m wide set of culverts should be connected to at minimum, 12x1m ,6x2m and 3x5m cells respectively. If in your own model you're unsure, then we suggest trying a couple of cell width connections and
=1D Timestep=
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