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></font> option can be used with <font color="blue"><tt>Read GIS CODE</tt></font> or <font color="blue"><tt>Read GIS Code BC</tt></font> 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.
Correct deactivation of active cells in areas of overlap can be reviewed via the [[TUFLOW_Check_Files | grd_check file]], shown below.<br>
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'''<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>
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