High-Speed Rarefied Flow Past a Rotating Cylinder: The Inverse Magnus Effect

John, Benzi; Gu, Xiaojun; Barber, Robert W.; Emerson, David R.

doi:10.2514/1.j054782

Cited by 20 publications

(13 citation statements)

References 30 publications

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“…All DSMC simulations (both fullscale DSMC as well as IMM subdomain atomistic solutions) have been carried out using the dsmcFoam + code (White et al 2017). The dsmcFoam + code operates within the framework of the open source CFD code, OpenFOAM (2014), and has been validated for a wide range of benchmark test cases (John et al 2016;Palharini et al 2015;Scanlon et al 2010;White et al 2017). To ensure accuracy of both our subdomain and full DSMC simulations, we have followed the established guidelines with respect to the cell size, time step, and particle numbers (Alexander et al 1998;Hadjiconstantinou 2000;Hadjiconstantinou et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Simulation of the head-disk interface gap using a hybrid multi-scale method

John

Lockerby

Patronis

et al. 2018

Microfluid Nanofluid

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We present a hybrid multi-scale method that provides a capability to capture the disparate scales associated with modelling flow in micro-and nano-devices. Our model extends the applicability of an internal-flow multi-scale method by providing a framework to couple the internal (small scale) flow regions to the external (large scale) flow regions. We demonstrate the application of both the original methodology and the new hybrid approach to model the flow field in the vicinity of the head-disk interface gap of a hard disk drive enclosure. The internal flow regions within the gap are modelled by an extended internal-flow multi-scale method that utilises a finite-difference scheme for non-uniform grids. Our proposed hybrid multiscale method is then employed to couple the internal micro-flow region to the flow external to the gap, to capture entrance/ exit effects. We also demonstrate the successful application of the method in capturing other localised phenomena (e.g. those due to localised wall heating).Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Resultsmentioning

confidence: 99%

Simulation of the head-disk interface gap using a hybrid multi-scale method

John

Lockerby

Patronis

et al. 2018

Microfluid Nanofluid

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“…Тем самым значительно снижается взаимодействие радикалов с поверхностью, что существенно влияет на строение формируемого фторполимерного покрытия. Например, к таким процессам можно отнести изменения полей давления и скорости вблизи поверхности образца, как это было показано для случая вращения цилиндра в разреженном газе [15].…”

Section: поступило в редакцию 29 июля 2020 г в окончательной редакциunclassified

Осаждение Фторполимерных Покрытий На Вращающиеся Цилиндрические Поверхности Методом Химического Осаждения Из Газовой Фазы, Активированной Горячей Нитью

Сафонов¹,

Старинский²,

Суляева³

2021

Письма В Журнал Технической Физики

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The Hot Wire Chemical Vapor Deposition method has been adapted to deposit fluoropolymer coatings onto rotating cylindrical surfaces with a small radius (less than 20 mm). The effect of the surface rotation frequency on the structure of a thin fluoropolymer coating deposited on it has been investigated. A significant change in the morphology of the formed fluoropolymer coating was found depending on the rotational frequency of the cylindrical surface. One more parameter has been established that makes it possible to change the structure of the formed fluoropolymer coating during the deposition process.

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“…The dsmcFoam C++ library has previously been validated against a variety of benchmark test cases involving a wide range of flow conditions [23,24]. Additional validation tests have been presented by the authors [19] comparing the computed drag coefficient for flow past a stationary (non-rotating) cylinder against experimental data [25] and the analytical free-molecular solution [26].…”

Section: Dsmc Code and Problem Formulationmentioning

confidence: 99%

“…The boundary conditions at the inflow and outflow are implemented by injecting particles with a Maxwellian velocity distribution corresponding to the physical conditions at the boundary [17]. The subsonic outflow boundaries employ a characteristic boundary condition [19,[27][28]; this involves specifying the exit pressure while other flow variables such as the velocity and density are derived from extrapolated values from the adjacent cells inside the computational domain. A preliminary study was undertaken to investigate the effect of the 12D 6D 15D…”

Section: Figure 1 Schematic Of Computational Domain (Not To Scale)mentioning

confidence: 99%

“…Riabov [16] used the direct simulation Monte Carlo (DSMC) method [17] to investigate the lift and drag coefficients on a rotating circular cylinder for a range of Knudsen numbers and roll parameters. More recently, the authors [18,19] have conducted comprehensive DSMC studies of the onset of the inverse Magnus effect. Our previous work has focused specifically on high-speed flow conditions in the transonic and supersonic regimes, and has shown that there…”

Section: Introductionmentioning

confidence: 99%

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On the inverse Magnus effect for flow past a rotating cylinder

John¹,

Gu²,

Barber³

et al. 2016

AIP Conference Proceedings

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Citation: B John et al. "On the inverse Magnus effect for flow past a rotatingAbstract. Flow past a rotating cylinder has been investigated using the direct simulation Monte Carlo method. The study focuses on the occurrence of the inverse Magnus effect under subsonic flow conditions. In particular, the variations in the coefficients of lift and drag have been investigated as a function of the Knudsen and Reynolds numbers. Additionally, a temperature sensitivity study has been carried out to assess the influence of the wall temperature on the computed aerodynamic coefficients. It has been found that both the Reynolds number and the cylinder wall temperature significantly affect the drag as well as the onset of lift inversion in the transition flow regime.

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High-Speed Rarefied Flow Past a Rotating Cylinder: The Inverse Magnus Effect

Cited by 20 publications

References 30 publications

Simulation of the head-disk interface gap using a hybrid multi-scale method

Simulation of the head-disk interface gap using a hybrid multi-scale method

Осаждение Фторполимерных Покрытий На Вращающиеся Цилиндрические Поверхности Методом Химического Осаждения Из Газовой Фазы, Активированной Горячей Нитью

On the inverse Magnus effect for flow past a rotating cylinder

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