1D Bridges: Difference between revisions

The following section looks at bridges using the 1D component of TUFLOW. Reference should also be made to Section 5.7.2 of the <u>[https://downloads.tuflow.com/_archive/TUFLOW/Releases/2018-03/TUFLOW%20Manual.2018-03.pdf 2018 TUFLOW Manual]</u>. For information on bridges in the 2D domain see <u>[[TUFLOW_2D_Hydraulic_Structures | 2D Hydraulic Structures]]</u> and <u>[[Tutorial_M11#Part_2_-_1D_Open_Channel_with_1D_Bridges_and_Weir_inflow_.282D.29_and_Outflow_.281D.29 | Module 11]]</u>. <br>

Adjustment of losses according to approach/departure velocities is the default from 1D channel to 1D bridge to 1D channel. However, for TUFLOW Builds prior to 2020-10-AA, if the BB bridge is linked directly to a 2D domain (typically via a SX link), there is no adjustment of entrance / exit losses on the sides connected to the 2D. This capability was introduced for 2D channel to 1D bridge to 2D channel in Build 2020-10-AA and onwards, and losses can be automatically adjusted based on the approach/departure 2D velocities across the SX connections by setting "<font color="blue"><tt>Structure Losses SX</tt></font> <font color="red"><tt>==</tt></font><tt> ADJUST</tt>" (see Section 6.2 of the <u>[https://downloads.tuflow.com/TUFLOW/Releases/2020-10/TUFLOW%20Release%20Notes.2020-10-AF.pdf 2020-10 Release Note]</u>). For B bridges the default is not to adjust losses (refer to the <u>[https://downloadsdocs.tuflow.com/_archiveclassic-hpc/TUFLOWmanual/Releaseslatest/2018-03/TUFLOW%20Manual.2018-03.pdf 2018 TUFLOW Manual]</u> for more information). In the case of 2D connections, refer to the links below for a discussion on the intricacies and challenges of taking into account contraction and expansion losses for 1D structures connected directly to 2D domains: