TUFLOW 2D Hydraulic Structures: Difference between revisions
Content deleted Content added
| (3 intermediate revisions by the same user not shown) | |||
Line 279:
| Total form loss of the bridge
| FLC/2 applied to all sides of the selected cells
| A cell is selected if the polyline intersects the cell crosshair. Caution should be taken when using a "thick" line, as changes in cell size can cause it to become a "wide" line. If this occurs, the FLC attribute
|-
| Wide
| larger than 1.5 times the cell size
| Total form loss
| FLC divided by number of cell sides in the direction of flow <br>
''(number of cell sides in the direction of flow is calculated as line width divided by cell size)''
|
Caution should be taken when using a "wide" line. The cell size and alignment of the 2d_lfcsh line may result in selecting too many or too few cell faces in the direction of the flow. The FLC input may need to be recalculated to ensure FLC Applied multiplied by the number of cell sides in the direction of flow equates to the intended total form loss.
|-
!rowspan="1" | Polygon
Line 334 ⟶ 335:
<br>
The following diagrams demonstrate how the input FLC is applied for the four geometry options for 2d_lfcsh and 2d_bg layers: <br>
[[File:2dlfcsh 2dbg combined v2.png|1200px]]
It is good modelling practice to check the <u>[[Check_Files_2d_lfcsh_uvpt | lfcsh_uvpt_check]]</u> and <u>[[Check Files 2d bg uvpt check | bg_uvpt_check]]</u> files to confirm the number of faces selected and the FLC values assigned. It is also strongly recommended to undertake a sensitivity analysis on the applied form losses in the model to check if it makes any difference to the results and/or double check against other methods (hand calculations, other software, CFD modelling), especially if the bridge is near an area of interest. If calibration data is available, this should be used to guide the form loss value specification.<br>
| |||