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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 twodimensional flow with Reynolds number Re ≈ 10,000 and nondimensional 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 perpendicular 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 nonspherical particles.
The validated simulations show significant deviations in perpendicular 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 nonspherical particles.
Original language  English 

Title of host publication  Proceedings of ASME 2017 Fluids Engineering Division Summer Meeting 
Number of pages  9 
Publisher  American Society of Mechanical Engineers 
Publication date  Aug 2017 
ISBN (Print)  9780791858066 
DOIs  
Publication status  Published  Aug 2017 
Event  ASME 2017 Fluids Engineering Division Summer Meeting  Waikoloa, United States Duration: 30 Jul 2017 → 3 Aug 2017 
Conference
Conference  ASME 2017 Fluids Engineering Division Summer Meeting 

Country  United States 
City  Waikoloa 
Period  30/07/2017 → 03/08/2017 
Fingerprint Dive into the research topics of 'Numerical and Experimental Study of the Rotational Behaviour of Flat Plates Falling Freely with Periodic Oscillating Motion'. Together they form a unique fingerprint.
Projects
 1 Finished

Extending the Existing Modelling Framework for NonSpherical Particles to Include Flat Plates in Free Fall  An Experimental and Numerical Investigation of the Unsteady Aerodynamics of Flat Plates
Hærvig, J., Jensen, A. L., Sørensen, H. & Pedersen, M. C.
03/02/2014 → 03/06/2014
Project: Research
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