A Numerical Study of Fluid Flow in a Vertical Slot Fishway with the Smoothed Particle Hydrodynamics Method

Abstract

Fishways have a great ecological importance as they help mitigate the interruptions of fish migration routes. In the present work, the novel DualSPHysics v4.4 solver, based on the smoothed particle hydrodynamics method (SPH), has been applied to perform three-dimensional (3-D) simulations of water flow in a vertical slot fishway (VSF). The model has been successfully calibrated against published field data of flow velocities that were measured with acoustic Doppler velocity probes. A state-of-the-art algorithm for the treatment of open boundary conditions using buffer layers has been applied to accurately reproduce discharges, water elevations, and average velocity profiles (longitudinal and transverse velocities) within the observed pool of the VSF. Results herein indicate that DualSPHysics can be an accurate tool for modeling turbulent subcritical free surface flows similar to those that occur in VSF. A novel relation between the number of fluid particles and the artificial viscosity coefficient has been formulated with a simple logarithmic fit.

Modified dynamic boundary conditions (mDBC) for general-purpose smoothed particle hydrodynamics (SPH): application to tank sloshing, dam break and fish pass problems

“…The discharge usually passes through openings in the cross-walls and fishes migrate from one pool to the next through the submerged orifices (or gates) or through the notches (or weirs). Previous examples of fish pass flows being simulated using DualSPHysics with DBC include the work of Novak et al [8] for a vertical slot type fish pass.…”

“…Smoothed particle hydrodynamics (SPH) is a meshless Lagrangian particle numerical method particularly adept at modelling complex, highly deforming interfacial and free-surface flows. In recent years, SPH numerical schemes have been successfully applied to a number of different phenomena, including sloshing tanks [1], sediment scour [2], debris flows [3], flow around bodies [4] and submarines [5], landslides and flooding [6,7], fish pass flows [8], wave action on breakwaters [9] with encouraging results. The SPH method is based on an integral approximation incorporating a kernel function (typically of compact support and characterised by a smoothing length, h).…”

“…DualSPHysics [23] is an open source SPH code for simulating free-surface flows that is able to run on both CPUs and GPUs (graphics processing units) [24]. Using DBC, complex geometries can be created such as those in [3,8] and [9]. This tackles one of the aspects of the Grand Challenge on boundary condition in SPH [10].…”

Performance Assessment of a Planing Hull Using the Smoothed Particle Hydrodynamics Method

“…Other validation for more complex channel flows can be found in Ref. [63] where a vertical slot fishway is modelled.…”

Mathematical modeling of flow in vertical slot fishways

“…Na sliki 1 je prikazan primer ribje steze z vertikalnimi režami na fizičnem modelu v pomanjšanem merilu. V preteklosti so bile izvedene številne raziskave tako na fizičnih hidravličnih modelih (Rajaratnam et al, 1986(Rajaratnam et al, , 1992Tan et al, 2018;Tarrade et al, 2011), z 2D matematičnimi modeli (Bermúdez et al, 2010;Bombač et al, 2017;Cea et al, 2007, Chorda et al, 2010Violeau, 2012), kot tudi s 3D matematičnimi modeli (Duguay et al, 2017;Novak et al, 2019;Sanagiotto et al, 2019). Z meritvami na fizičnih hidravličnih modelih in na prototipih (Bombač et al, 2015) je bilo dokazano, da je tok v ribjih stezah z vertikalnimi režami praktično dvodimenzionalen.…”