Optimizing attraction flow for upstream fish passage at a hydropower dam employing 3D Detached-Eddy Simulation

Detached-eddy Simulation: Current Status and Perspectives

Detached-Eddy Simulation (DES) is a hybrid technique proposed in 1997 as a numerically feasible and plausibly accurate approach for predicting massively separated flows. Since its inception the method has been applied to a range of configurations including simple shapes such as cylinders, spheres and aircraft forebodies, in addition to complex geometries including fighter aircraft. The accuracy...

Evaluation of Detached Eddy Simulation for Turbulent Wake Applications

Simulations of a low-speed square cylinder wake and a supersonic axisymmetric base wake are performed using the Detached Eddy Simulation (DES) model. A reduced-dissipation form of the Symmetric TVD scheme is employed to mitigate the effects of dissipative error in regions of smooth flow. The reduceddissipation scheme is demonstrated on a 2D square cylinder wake problem, showing a marked improve...

Local Entropy Generation in Compressible Flow through a High Pressure Turbine with Delayed Detached Eddy Simulation

Abstract: Gas turbines are important energy-converting equipment in many industries. The flow inside gas turbines is very complicated and the knowledge about the flow loss mechanism is critical to the advanced design. The current design system heavily relies on empirical formulas or Reynolds Averaged Navier–Stokes (RANS), which faces big challenges in dealing with highly unsteady complex flow a...

A Toolkit for Optimizing Fish Passage Barrier Mitigation Actions

Fish Passage Technologies: Protection at Hydropower Facilities (Part 6 of 11)

he implementation of downstream mitigation for fish passage at hydropower facilities has three distinct goals: to transport fish downstream; to prevent fish from entrainment in turbine intakes; and to move fish, in a timely and safe manner, through a reservoir.1 A range of mitigation methods for downstream passage and for prevention of turbine entrainment exist, and some have been applied with ...