Large-eddy simulations of a swirling flow in a model Francis turbine

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چکیده

Abstract We performed Large-eddy simulations of the flow in a model air Francis turbine range low-load regimes with swirler rotating at fixed frequency. All investigated revealed presence coherent helical vortex structure draft tube: precessing core. identified frequency this instability and obtained mean velocity fields to be utilized further works.

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Large-eddy simulations of flow and heat transfer around a low-Mach number turbine blade

Modeling of wall bounded flows and conjugate heat transfer (CHT) is known to be a challenging task for Large-Eddy Simulation (LES). In the boundary layers, the inertial and dissipative scales have similar sizes, which implies relying on different modeling approaches than those used in free turbulent flows. To this aim, a numerical database of highly-refined LES and CHT simulations is built and ...

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ژورنال

عنوان ژورنال: Journal of physics

سال: 2021

ISSN: ['0022-3700', '1747-3721', '0368-3508', '1747-3713']

DOI: https://doi.org/10.1088/1742-6596/2119/1/012026