主题: The scaling of the drag force on an accelerating plate
日期: 2024年5月3日，星期五，4:00 PM（伦敦时间）
2024年5月3日，星期五，11:00 PM（北京时间）
语言: 英文
概要:
The drag force on an accelerating object is usually described by a quasi-steady force that scales with the square of the instantaneous velocity and an added mass force due to the acceleration that scales directly proportional to the acceleration. This appears to underestimate the experimentally observed instantaneous drag force on an accelerating plate. We aim to find a better description of the drag force on a flat plate in an unsteady flow by measuring both the drag force and velocity field for a large range of constant accelerations and velocities. Our experiments show that the force due to acceleration scales with the square root of the acceleration, contrary to a linear scaling that is expected from added mass. This can be associated with a history force that describes the generation and advection of vorticity at the plate surface. We present a new scaling law for the drag force on accelerating plates. This avoids previous inconsistencies in using added mass forces in the description of forces on accelerating plates. This new scaling law has proven useful in predicting the drag force for different plate geometries and non-constant accelerations.
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Speaker
Prof. Jerry Westerweel
Host
Journal of Fluid Mechanics
Flow: Applications of Fluid Mechanics
Leeds Institute for Fluid Dynamics
Department of Applied Mathematics and Theoretical Physics
UK Fluids Network
*本文由剑桥大学出版社北京办公室编译，中文内容仅供参考，请以原文为准。如需转载，请联系FLM_Flow@cambridge.org。
JFM&Flow
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