Numerical and physical model study of a vertical slot fishway

Abstract

This paper presents the results of an experimental and numerical study of a vertical slot fishway (VSF). A 2-D depth-averaged shallow water numerical model PCFLOW2D coupled with three different turbulent models (constant eddy viscosity, Smagorinsky and k -ε) was used. A detailed analysis of numerical parameters needed for a correct simulation of the phenomenon was carried out. Besides the velocity field, attention was paid to important hydraulic parameters such as maximum velocity in the slot region and energy dissipation rate ε in order to evaluate the performance of VSF. A scaled physical hydraulic model was built to ensure reliable experimental data for the validation of the numerical model. Simulations of variant configurations of VSF showed that even small changes in geometry can produce more fishfriendly flow characteristics in pools. The present study indicates that the PCFLOW2D program is an appropriate tool to meet the main demands of the VSF design.

Individual-based model of juvenile eel movement parametrized with computational fluid dynamics-derived flow fields informs improved fish pass design

“…First, the near-substrate velocity fields in a pass comprising eel tiles produced by Berry & Escott Engineering [18] are quantified using three-dimensional computational fluid dynamics (CFD) modelling. The flow structures within common fish passes have previously been studied both experimentally and through the use of CFD (see [21][22][23][24]), but the hydrodynamic structure of eel passes has not yet been quantified. Second, the performance of an example pass is assessed by repeating numerical simulations over a range of installation angles and flow rates, and comparing the resulting velocity fields against the known swimming capabilities of elvers of a range of sizes.…”

Three-dimensional numerical simulation of flow in vertical slot fishways: validation of the model and characterization of the flow

“…From Equation 15, volumetric dissipated power fields can be constructed, with detail that contributes to a better evaluation of the suitability of a fishway for the swimming capacity of the target species (BOMBAČ et al, 2014).…”

“…The flow in vertical slot fishways has been the subject of prior experimental studies (e.g., BOMBAČ et al, 2014;CALLUAUD et al, 2014;MARRINER et al, 2016;VAN DER VINNE;KATOPODIS, 1986;SOLANKI, 1992;SANAGIOTTO et al, 2012SANAGIOTTO et al, , 2011VIANA;MARTINEZ, 2014;WU;KATOPODIS, 1999) and numerical evaluations (e.g., AN et al, 2016;NOVAK, 2017;MARRINER et al, 2014).…”

Numerical Modelling of Fish Passage with Turning Pools

“…Depending on the complexity of the problem in terms of geometry and flow conditions, one can adopt a different mathematical model, that is, the simplified Navier-Stokes equation. In simple cases, 2D depth-averaged shallow water models are often sufficient (Cea et al 2007, Alvarez-Vazquez et al 2008, Baek and Kim, 2014, Bombač et al 2014. More complex problems demand the application of 3D RANS (Reynolds-Averaged Navier-Stokes) equations, which have the advantage of yielding a solution in three dimensions, making it possible to observe flow parameters at various depths of the flow field (Barton et al 2009, Feurich et al 2012, Mao et al 2012, Lindberg et al 2013, Marriner et al 2014.…”

“…There are a great number of models in which turbulence viscosity, as a parameter of the fluid, is derived from different equations. In most cases, the k-ε model is used (Cea et al 2007, Barton et al 2009, Feurich et al 2012, Mao et al 2012, Lindberg et al 2013, Marriner et al 2014, Bombač et al 2014, but one can find other models, e.g. the mixing length model (Cea et al 2007), the Smagorinsky model (Bombač et al 2014) or the algebraic stress model (ASM) (Cea et al 2007).…”