Very-Large Eddy Simulations of Disk Heat Transfer in a Rotating Cavity Using Lattice-Boltzmann Method

Kouwa, Junya; Iso, Yoshiyuki; Polidoro, Francesco; Gautier, Sebastien

doi:10.1115/gt2018-76832

Cited by 2 publications

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“…Very Large Eddy Simulations using a Lattice-Boltzmann solver were reported by Kouwa et al [30] at Grashof numbers of up to 7.17 × 10 11 . The mesh was refined locally around walls and in the axial throughflow-cavity shear layer.…”

Section: Computational Investigationsmentioning

confidence: 99%

Some Observations on the Computational Sensitivity of Rotating Cavity Flows

Hickling

2021

Journal of Engineering for Gas Turbines and Power

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Across the open literature, there is no clear consensus on what the most suitable modelling fidelity is for rotating cavity flows. Although it is a widely held opinion that URANS approaches are unsuitable, many authors have succeeded in getting reasonable heat transfer results with them. There is also a lack of research into the validity of hybrid URANS/LES type approaches such as DES. This paper addresses these research challenges with a systematic investigation of a rotating cavity with axial throughflow at Grashof numbers of 3.03 × 109 and 3.03 × 1011. The disk near-wall layers remained laminar at both conditions, meaning that a turbulence model should not be active in these regions. The disk heat transfer was observed to affect the near-disk aerodynamics, which in turn affect the disk heat transfer: this feedback loop implies that conjugate heat transfer computations of rotating cavities may be worth investigating. On the shroud, additional eddy viscosity in URANS and DES was found to interfere with the formation of heat transfer enhancing streaks, whilst these were always captured by LES. DES exhibited a concerning behaviour at the higher Grashof number. Locally generated eddy viscosity from the shroud was injected into the bulk fluid by the radial inflow. This contaminated the entire cavity with non-physical modelled turbulence. As the radial inflow is a characteristic feature of rotating cavity flows, these results show that caution is necessary when applying hybrid URANS/LES approaches to this type of flow.

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Section: Computational Investigationsmentioning

confidence: 99%

Some Observations on the Computational Sensitivity of Rotating Cavity Flows

Hickling

2021

Journal of Engineering for Gas Turbines and Power

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Some Observations on the Computational Sensitivity of Rotating Cavity Flows

Hickling¹,

He²

2021

Preprint

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Across the open literature, there is no clear consensus on what the most suitable modelling fidelity is for rotating cavity flows. Although it is a widely held opinion that URANS approaches are unsuitable, many authors have succeeded in getting reasonable heat transfer results with them. There is also a lack of research into the validity of hybrid URANS/LES type approaches such as DES. This paper addresses these research challenges with a systematic investigation of a rotating cavity with axial throughflow at Grashof numbers of 3.03 × 10 9 and 3.03 × 10 11 .The disk near-wall layers remained laminar at both conditions, meaning that a turbulence model should not be active in these regions. The disk heat transfer was observed to affect the near-disk aerodynamics, which in turn affect the disk heat transfer: this feedback loop implies that conjugate heat transfer computations of rotating cavities may be worth investigating. On the shroud, additional eddy viscosity in URANS and DES was found to interfere with the formation of heat transfer enhancing streaks, whilst these were always captured by LES. DES exhibited a concerning behaviour at the higher Grashof number. Locally generated eddy viscosity from the shroud was injected into the bulk fluid by the radial inflow. This contaminated the entire cavity with non-physical

show abstract

Very-Large Eddy Simulations of Disk Heat Transfer in a Rotating Cavity Using Lattice-Boltzmann Method

Cited by 2 publications

References 0 publications

Some Observations on the Computational Sensitivity of Rotating Cavity Flows

Some Observations on the Computational Sensitivity of Rotating Cavity Flows

Some Observations on the Computational Sensitivity of Rotating Cavity Flows

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