Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1088/1742-6596/782/1/012005
Ключевые слова: CFD, Francis turbine, LES, numerical simulation, pressure pulsation, RANS and DES models, the precession of the vortex rope, turbulence, Computer simulation, Francis turbines, Hydraulic turbines, Large eddy simulation, Navier Stokes equations, Numerical models, Reynolds number, Turbulence models, Turbulent flow, Calculation results, Detached eddy simulations, Francis hydro-turbine, Mean velocity components, Numerical flow simulations, Steady-state operation, Vortex rope, Computational fluid dynamics
Аннотация: We performed numerical simulation of flow in a laboratory model of a Francis hydroturbine at three regimes, using two eddy-viscosity- (EVM) and a Reynolds stress (RSM) RANS models (realizable k-, k-? SST, LRR) and detached-eddy-simulations (DES), as well as large-eddy simulations (LES). Comparison of calculation results with the exПоказать полностьюperimental data was carried out. Unlike the linear EVMs, the RSM, DES, and LES reproduced well the mean velocity components, and pressure pulsations in the diffusor draft tube. Despite relatively coarse meshes and insufficient resolution of the near-wall region, LES, DES also reproduced well the intrinsic flow unsteadiness and the dominant flow structures and the associated pressure pulsations in the draft tube.
Журнал: 2nd Francis-99 Workshop: Transient Operation of Francis Turbines (14 December 2016 through 15 December 2016
Выпуск журнала: Vol. 782, Is. 1