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TUFLOW 2D2D BC Advice: Difference between revisions

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This section provides best practise advice for configuring TUFLOW 2D/2D boundaries. <br>
 
Multiple domain models are defined in TUFLOW using 2D domain blocks within the TCF file. Each domain block is defined using <font color="blue"><tt> Start 2D Domain </tt></font> <font color="red"><tt>== </tt></font> <tt> <name> </tt> and <font color="blue"><tt> End 2D Domain </tt></font> commands. Unique geometry control file, boundary condition file, initial water level, plot output and time step commands are defined within each domain block. All other commands (such as the boundary condition database, material file references, Estryestry control file and simulation time and map output commands) are defined outside the above mentioned 2D domain blocks. An example TCF file is shown below. Line 8 to 13 represents the first 2D domain. Line 15 to 20 contain the second 2D domain block. <br>
 
[[File: 2D2D_Guidance_000.JPG |450px]]<br>
 
Some bestuseful practisetips adviceare for configuring a 2D / 2D boundary is listedprovided below:<br>
<ol>
<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>
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'''<u>2D BC "2D" Line Vertex Location and Hidden 1D Node Options'''</u>'''<br>
As previously mentioned, flow is transferred between both domains via a series of hidden 1D nodes. TUFLOW creates these at each vertex along the 2d_bc "2D" link line and also at a regular interval, as defined by the “d” attribute.<br>
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>▼
 
▲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>
* In regions of low velocity (<0.5m/s), the “d” value should be no less than three times the distance of the larger cell resolution associated with the 2D/2D boundary. For example, if the model adopts a 2.5m and 5m resolution, the “d” attribute should be set no smaller than 15m.<br>▼
 
[[File: 2D2D_Guidance_006.JPG |400px]]<br>▼
* In regions of moderate to high velocity (>0.5m/s),larger ormanual novertex placement on the river banks and natural ridges in addition to a “d” value of 0 is common used. Not specifyingUsing a “d” value of 0 will create a hidden 1D node at each vertex along the 2d_bc “2D” link line. No intermediate hidden 1D nodes will be created.<br>
[[File: 2D2D_Guidance_007.JPG |400px]]<br>
 
▲* InModel results are less sensitive to the hidden 1D node placement in regions of low velocity (<0.5m/s),. theAutomated placement by using a “d” values greater than 0 is common in this situation. The selected value should be no less than three times the distancesize of the larger cell resolution associated with the 2D/2D boundary. For example, if the model adoptsuses a 2.5m and 5m resolution, the “d” attribute should be set no smaller than 15m.<br>
▲[[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 (<0.5m/s): “a” <=3<br>▼
* Moderate to high velocity area (>0.5m/s): “a” <=6<br>
▲* Low velocity area (<0.5m/s): “a” <=3<br>
 
'''<u>Separate 2D BC “2D” Link Lines'''</u>'''<br>
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[[File: 2D2D_Guidance_008.JPG |400px]]<br>
</li>
</ol>
<li> Example 2D/2D models are available for download from the [[Example_Models_Home_page | Example Models]] page of the Wiki.
</li>
</ol>
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