TUFLOW 2D2D BC Advice: Difference between revisions
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<li>When one domain is nested within another, remember to deactivate the active cells in the parent domain (mesh) where the domains overlap. This is done in the parent domain TGC file.<br>
The <font color="blue"><tt>INVERT</tt> option can be used with Read GIS CODE or Read GIS Code BC to deactivate the active cells using the same GIS polygon that is used to define the active cells in the child domain. If INVERT is specified (eg. Read GIS Code Invert or Read GIS Code BC Invert), the active/inactive status of any Code polygon is reversed (i.e. a Code of 1 becomes 0, and a Code of -1 or 0 becomes 1). This means that the same layer can be used by both TGC files when linking 2D domains.<br>
Correct deactivation of active cells in areas of overlap can be reviewed by viewing the [_grd_check file | TUFLOW_Check_Files].<br>
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Some 2d_bc “2D” link line definition advice is provided below:<br>
'''<u>2D BC 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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The 2d_bc “2D” link line can be orientated in any direction within floodplain areas with low velocity (<1m/s). The 2d_bc “2D” link line “d” attribute should be used in this situation.<br>
'''<u>Line Vertex Location'''</u>'''<br>
2d_bc “2D” link line vertices are best located on ridges or embankments, particularly if the features become inundated and drowned out during a simulation.<br>
2d_bc “2D” link line “d” attribute can be used to insert additional “hidden” vertices (storage nodes) between the manually specified vertices location.<br>
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In regions of high velocity (>1m/s), greater or no “d” value is common. Not specifying a “d” value will create a hidden 1D node at each vertex along the 2d_bc “2D” link line.<br>
'''<u>Storage Multiplier'''</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>
Low velocity area (>1m/s): “a” <=6<br>
'''<u>Separate “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>
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