Turbulent Couette–Taylor flows with endwall effects: A numerical benchmark

Poncet, Sébastien; Soghe, Riccardo Da; Bianchini, Claudio; Viazzo, Stéphane; Aubert, Adrien

doi:10.1016/j.ijheatfluidflow.2013.05.018

Cited by 29 publications

(6 citation statements)

References 34 publications

(66 reference statements)

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“…The results of Wang 22 are consistent with the numerical study performed by Poncet et al, 25 who considered turbulent Taylor–Couette flow for a wide-gap geometry. The authors investigated a range of modelling techniques, such as the URANS RSM model, large eddy simulation (LES) techniques, including an SST k-ω SAS approach, and DNS.…”

Section: Introductionsupporting

confidence: 86%

Computational modelling of turbulent Taylor–Couette flow for bearing chamber applications: A comparison of unsteady Reynolds-averaged Navier–Stokes models

Nicoli

Johnson

Jefferson-Loveday

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The capability to accurately model fluid flow within rotating Taylor–Couette systems has a primary role in informing computational investigations of rotating machinery. There is considerable uncertainty regarding selection of modelling approach, including a suitable turbulence model, that can accurately resolve turbulence within such complex flows while remaining computationally feasible for industrially relevant applications. This paper presents a numerical comparison of axisymmetric and three-dimensional unsteady Reynolds-averaged Navier–Stokes (URANS) turbulence models within ANSYS Fluent. The CFD geometries are representative of ones for which there are published experimental measurements. For the Taylor–Couette study, investigation into inner cylinder start-up procedure, based on previous published findings, confirmed that the final state of the flow is highly dependent on the initial conditions and acceleration rate. Once Taylor vortices form and stabilise, they are not disrupted by small steps in inner cylinder speed, allowing computationally efficient accelerations. Investigations into applying rotational periodicity were unsuccessful, resulting in a significantly reduced core velocity. Axisymmetric predictions provided reasonable agreement with experimental data only at low rotation rates. A good prediction of the velocity flow field was obtained for three-dimensional simulations of the full 360° domain with differences of less than 5% for radial velocities. Among the URANS models, the standard k-ω model and baseline Reynolds stress model (BSL-RSM) provided the closest agreement to published experimental data. In the paper, the developed Taylor–Couette turbulence modelling methodology is extended to a bearing chamber geometry. Analysis of the secondary vortex flow field is compared both qualitatively and quantitatively to published bearing chamber experimental measurements. Overall, whilst a good agreement is still found using the standard k-ω turbulence model, discrepancies arise with the BSL-RSM. However, for this more complex bearing chamber environment compared to a Taylor–Couette flow, the shear stress transport k-ω turbulence model provided the closest agreement and is recommended for future bearing chamber modelling.

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Section: Introductionsupporting

confidence: 86%

Computational modelling of turbulent Taylor–Couette flow for bearing chamber applications: A comparison of unsteady Reynolds-averaged Navier–Stokes models

Nicoli

Johnson

Jefferson-Loveday

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Chung et al 10 It is noteworthy that the present multidomain solver in its DNS version has already been validated by Viazzo and Poncet 21 against analytical solutions and experimental data to investigate the stability of enclosed Taylor-Couette flows subjected to a radial temperature gradient in a large aspect ratio system. Poncet et al 22 also compared very favorably the multidomain DNS solver in the case of turbulent enclosed Taylor-Couette flows in a small aspect ratio cavity with endcap rings against published velocity measurements.…”

Section: A Numerical Methodsmentioning

confidence: 99%

Large eddy simulations of Taylor-Couette-Poiseuille flows in a narrow-gap system

2014

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International audienceThe present paper concerns Large-Eddy Simulations (LES) of turbulent Taylor-Couette-Poiseuille flows in a narrow-gap cavity for six different combinations of rotational and axial Reynolds numbers. The in-house numerical code has been first validated in a middle-gap cavity. Two sets of refined LES results, using the Wall-Adapting Local EddyViscosity(WALE) and theDynamic Smagorinsky subgrid-scale models availablewithin an in-house code based on high-order compact schemes, have been then compared with no noticeable difference on the mean flow field and theturbulent statistics. The WALE model enabling a saving of about 12% of computational effort has been finally used to investigate the influence on the hydrodynamics of the swirl parameter N within the range [1.49 − 6.71]. The swirl parameter N, which compares the effects of rotation of the inner cylinder and the axial flowrate, does not influence significantly the mean velocity profiles. Turbulence intensities are enhanced with increasing values of N with remarkably high peak values within the boundary layers. The inner rotating cylinder has a destabilizing effect inducing asymmetric profiles of the Reynolds stress tensor components. The rotor and stator boundary layers exhibit the main characteristics of two-dimensional boundary layers.Turbulence is also mainly at two-component there. Thin coherent structures appearing as negative (resp. positive) spiral rolls are observed along the rotor (resp. stator) side. Their inclination angle depends strongly on the value of the swirl parameter, which fixes the intensity of the crossflow. On the other hand, the intensity and the size of the coherent structures observed within the boundary layers are governed by the effective Reynolds number. For its highest value, they penetrate the whole gap. Finally, the results have been extended to the non-isothermal case in the forced convection regime. A correlation for the Nusselt number along the rotor has been provided showing a much larger dependence on the axial Reynolds number thanexpected from previous published works, while it depends classically on the Taylor number to the power 0.145 and on the Prandtl number to the power 0.3

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“…Due to the ambiguous nature of the higherorder instabilities, the transition pathway to turbulence differs in the published literature [77,97]. Several experimental [16,[102][103][104][105][106] and numerical [107][108][109][110][111] works address the conventional, inertia-driven turbulent flow in the TC system, summarized in the review of [17]. State-of-theart TC facilities [112] have been developed and dedicated to the systematic study of turbulent TC flow of Newtonian fluids.…”

Section: (A) Inertia-dominated Transitionsmentioning

confidence: 99%

Experimental insights into elasto-inertial transitions in Taylor–Couette flows

Boulafentis

Lacassagne

Cagney

et al. 2023

Phil. Trans. R. Soc. A.

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Since the seminal work of Taylor in 1923, Taylor–Couette (TC) flow has served as a paradigm to study hydrodynamic instabilities and bifurcation phenomena. Transitions of Newtonian TC flows to inertial turbulence have been extensively studied and are well understood, while in the past few years, there has been an increasing interest in TC flows of complex, viscoelastic fluids. The transitions to elastic turbulence (ET) or elasto-inertial turbulence (EIT) have revealed fascinating dynamics and flow states; depending on the rheological properties of the fluids, a broad spectrum of transitions has been reported, including rotating standing waves, flame patterns (FP), and diwhirls (DW). The nature of these transitions and the relationship between ET and EIT are not fully understood. In this review, we discuss experimental efforts on TC flows of viscoelastic fluids. We outline the experimental methods employed and the non-dimensional parameters of interest, followed by an overview of inertia, elasticity and elasto-inertia-driven transitions to turbulence and their modulation through shear thinning or particle suspensions. The published experimental data are collated, and a map of flow transitions to EIT as a function of the key fluid parameters is provided, alongside perspectives for the future work. This article is part of the theme issue 'Taylor–Couette and related flows on the centennial of Taylor’s seminal Philosophical Transactions paper (part 1)'.

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Turbulent Couette–Taylor flows with endwall effects: A numerical benchmark

Cited by 29 publications

References 34 publications

Computational modelling of turbulent Taylor–Couette flow for bearing chamber applications: A comparison of unsteady Reynolds-averaged Navier–Stokes models

Computational modelling of turbulent Taylor–Couette flow for bearing chamber applications: A comparison of unsteady Reynolds-averaged Navier–Stokes models

Large eddy simulations of Taylor-Couette-Poiseuille flows in a narrow-gap system

Experimental insights into elasto-inertial transitions in Taylor–Couette flows

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