TUFLOW 2D2D BC Advice: Difference between revisions
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Some 2d_bc “2D” link line definition advice is provided below:<br><br>
'''<u>2D BC "2D" Line Orientation'''</u>'''<br>
* The 2d_bc “2D” link line should be orientated perpendicular to the flow direction in areas of moderate to high velocity (>1m/s), such as across a river or creek.<br>
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[[File: 2D2D_Guidance_005.JPG |400px]]<br>
'''<u>2D BC "2D" Line Vertex
2d_bc “2D” link line vertices are best located on ridges or embankments, including features that become inundated and drowned out during a simulation. 2d_bc “2D” link line “d” attribute can be used to insert additional hidden 1D nodes between the manually specified vertices location.<br>
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[[File: 2D2D_Guidance_006.JPG |400px]]<br>
'''<u>2D BC "2D" Line Storage Multiplier Options'''</u>'''<br>
2d_bc “2D” link line “a” attribute defines the storage allocation to each of the hidden 1D nodes. The default value is 2. Increasing the value may improve stability, though but may unacceptably attenuate results. Sensitivity testing has identified the following recommended maximum values:<br>
* Low velocity area (<1m/s): “a” <=3<br>
* Moderate to high velocity area (>1m/s): “a” <=6<br>
'''<u>Separate 2D BC “2D” Link Lines'''</u>'''<br>
Consider using separate 2D boundary condition lines where there are unique flow paths separated by areas of dry land.<br>
[[File: 2D2D_Guidance_007.JPG |400px]]<br>
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