Revision as of 09:50, 1 June 2022 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,378 edits →Should I use both FLC and blockage for layer one in 2D bridge layered flow constriction? ← Older edit		Revision as of 11:01, 3 June 2022 view source Pavlina Monhartova (talk \| contribs) Bureaucrats, Administrators 5,378 edits →Why am I seeing flow through a 2d_lfcsh with 100% blockage applied? Newer edit →
Line 94: Layered FC’s function by adjusting the flow area of the cell faces by any blockages to generate the correct depth averaged velocity at each face at which the form losses are applied as a fraction of the V<sup>2</sup>/2g kinetic energy. Calculating the correct velocity is critical for determining the losses as the losses are proportional to the velocity squared. <br> For a Layered FC cell face the flow area cannot be zero above the invert of Layer 1 to avoid a divide by zero in the computations, therefore a minimum average flow width after applying blockages of 0.001 m is applied. ~~Therefore,~~ if Layer 1 is 100% blocked, a very small amount of water will flow through Layer 1. If this is unacceptable, instead of applying 100% blockage of Layer 1, the preferred approach is to start the Layered FC at the top of Layer 1 or raise the ground elevation to the top of Layer 1 using one of the Z Shape modification functions (e.g. a breakline). <br> For bridges, where Layer 2 has a 100% blockage applied, the minimum flow width of 0.001m is used and is averaged with the Layer 1 blockage (based on the depth of the water). This may result in a water level being reported within or above the bridge deck, which would represent the pressure head.

TUFLOW 2D Hydraulic Structures: Difference between revisions