Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

When a flat plate falls freely in periodic oscillating motion regime, unsteady fluid forces create additional lift force contributions due to the rotational behaviour. Computational fluid dynamics is used to simulate the free fall behaviour of a flat plate with aspect ratio β = 20 falling in two-dimensional flow with Reynolds number Re ≈ 10,000 and non-dimensional moment of inertia I* = 0.115. To validate the free fall trajectory obtained by computational fluid dynamics, video recordings are used. Based on the validated free fall computational fluid dynamics simulation, the instantaneous fluid forces and torques on the plate are obtained.

The validated simulations show significant deviations in per-pendicular and tangential force coefficients at the same angle of attack depending on the trajectory history of the plate. At low angles of attack below 5 deg, the tangential force differs significantly. Oppositely, the difference in the perpendicular force is most pronounced at high angles of attack. During a free fall, the angle of attack is below 5 deg in 70 % of the time. Furthermore, the angle of attack is only above 45 deg in less than 5 % of the time. Therefore, effort must be put into a more detailed description of the tangential force component, in order to improve the existing modelling framework for non-spherical particles.
OriginalsprogEngelsk
TitelProceedings of ASME 2017 Fluids Engineering Division Summer Meeting
Antal sider9
ForlagAmerican Society of Mechanical Engineers
Publikationsdatoaug. 2017
ISBN (Trykt)978-0-7918-5806-6
DOI
StatusUdgivet - aug. 2017
BegivenhedASME 2017 Fluids Engineering Division Summer Meeting - Waikoloa, USA
Varighed: 30 jul. 20173 aug. 2017

Konference

KonferenceASME 2017 Fluids Engineering Division Summer Meeting
LandUSA
ByWaikoloa
Periode30/07/201703/08/2017

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Angle of attack
Computational fluid dynamics
Trajectories
Video recording
Fluids
Aspect ratio
Reynolds number
Torque
Computer simulation

Citer dette

Hærvig, J., Jensen, A. L., Pedersen, M. C., & Sørensen, H. (2017). Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion. I Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting American Society of Mechanical Engineers. https://doi.org/10.1115/FEDSM2017-69503
Hærvig, Jakob ; Jensen, Anna Lyhne ; Pedersen, Marie Cecilie ; Sørensen, Henrik. / Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion. Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017.
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title = "Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion",
abstract = "When a flat plate falls freely in periodic oscillating motion regime, unsteady fluid forces create additional lift force contributions due to the rotational behaviour. Computational fluid dynamics is used to simulate the free fall behaviour of a flat plate with aspect ratio β = 20 falling in two-dimensional flow with Reynolds number Re ≈ 10,000 and non-dimensional moment of inertia I* = 0.115. To validate the free fall trajectory obtained by computational fluid dynamics, video recordings are used. Based on the validated free fall computational fluid dynamics simulation, the instantaneous fluid forces and torques on the plate are obtained.The validated simulations show significant deviations in per-pendicular and tangential force coefficients at the same angle of attack depending on the trajectory history of the plate. At low angles of attack below 5 deg, the tangential force differs significantly. Oppositely, the difference in the perpendicular force is most pronounced at high angles of attack. During a free fall, the angle of attack is below 5 deg in 70 {\%} of the time. Furthermore, the angle of attack is only above 45 deg in less than 5 {\%} of the time. Therefore, effort must be put into a more detailed description of the tangential force component, in order to improve the existing modelling framework for non-spherical particles.",
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Hærvig, J, Jensen, AL, Pedersen, MC & Sørensen, H 2017, Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion. i Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, Waikoloa, USA, 30/07/2017. https://doi.org/10.1115/FEDSM2017-69503

Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion. / Hærvig, Jakob; Jensen, Anna Lyhne; Pedersen, Marie Cecilie; Sørensen, Henrik.

Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion

AU - Hærvig, Jakob

AU - Jensen, Anna Lyhne

AU - Pedersen, Marie Cecilie

AU - Sørensen, Henrik

PY - 2017/8

Y1 - 2017/8

N2 - When a flat plate falls freely in periodic oscillating motion regime, unsteady fluid forces create additional lift force contributions due to the rotational behaviour. Computational fluid dynamics is used to simulate the free fall behaviour of a flat plate with aspect ratio β = 20 falling in two-dimensional flow with Reynolds number Re ≈ 10,000 and non-dimensional moment of inertia I* = 0.115. To validate the free fall trajectory obtained by computational fluid dynamics, video recordings are used. Based on the validated free fall computational fluid dynamics simulation, the instantaneous fluid forces and torques on the plate are obtained.The validated simulations show significant deviations in per-pendicular and tangential force coefficients at the same angle of attack depending on the trajectory history of the plate. At low angles of attack below 5 deg, the tangential force differs significantly. Oppositely, the difference in the perpendicular force is most pronounced at high angles of attack. During a free fall, the angle of attack is below 5 deg in 70 % of the time. Furthermore, the angle of attack is only above 45 deg in less than 5 % of the time. Therefore, effort must be put into a more detailed description of the tangential force component, in order to improve the existing modelling framework for non-spherical particles.

AB - When a flat plate falls freely in periodic oscillating motion regime, unsteady fluid forces create additional lift force contributions due to the rotational behaviour. Computational fluid dynamics is used to simulate the free fall behaviour of a flat plate with aspect ratio β = 20 falling in two-dimensional flow with Reynolds number Re ≈ 10,000 and non-dimensional moment of inertia I* = 0.115. To validate the free fall trajectory obtained by computational fluid dynamics, video recordings are used. Based on the validated free fall computational fluid dynamics simulation, the instantaneous fluid forces and torques on the plate are obtained.The validated simulations show significant deviations in per-pendicular and tangential force coefficients at the same angle of attack depending on the trajectory history of the plate. At low angles of attack below 5 deg, the tangential force differs significantly. Oppositely, the difference in the perpendicular force is most pronounced at high angles of attack. During a free fall, the angle of attack is below 5 deg in 70 % of the time. Furthermore, the angle of attack is only above 45 deg in less than 5 % of the time. Therefore, effort must be put into a more detailed description of the tangential force component, in order to improve the existing modelling framework for non-spherical particles.

U2 - 10.1115/FEDSM2017-69503

DO - 10.1115/FEDSM2017-69503

M3 - Article in proceeding

SN - 978-0-7918-5806-6

BT - Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting

PB - American Society of Mechanical Engineers

ER -

Hærvig J, Jensen AL, Pedersen MC, Sørensen H. Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion. I Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers. 2017 https://doi.org/10.1115/FEDSM2017-69503