Abstract
Abstract
Highlights
The present work investigates the flow-induced vibration of a flexible thin plate in axial flow: a cantilevered thin plate of length L, height H and thickness h subjected to a fluid flowing axially with velocity U and directed from the free end towards the clamped one, otherwise known as an “inverted flag” as shown in Figure 1 [5]
Goza et al [1] showed computationally that for sufficiently heavy flags, i.e. 1, large-amplitude flapping occurs even for ReL < 50, where vortex shedding essentially does not occur; neither large-amplitude nor small-amplitude flapping can be attributed to the classical vortex-induced vibration (VIV) mechanism. [3] performed simulations in which a long rigid splitter plate was attached to the flag trailing edge, delaying trailing-edge vortex formation and shedding to large distances from the flag and eliminating the interactions between vortices detached from the leading edge at the cycle extremities They found that the flags undergo large-amplitude flapping regardless – a prediction not yet verified experimentally, which is, one of the objectives of the present paper
2.1 Dynamics of inverted flags with a rigid splitter plate attached to the trailing edge
Summary
The present work investigates the flow-induced vibration of a flexible thin plate in axial flow: a cantilevered thin plate (or ‘flag’) of length L, height H and thickness h subjected to a fluid flowing axially with velocity U and directed from the free end towards the clamped one, otherwise known as an “inverted flag” as shown in Figure 1 [5]. [3] performed simulations in which a long rigid splitter plate was attached to the flag trailing edge, delaying trailing-edge vortex formation and shedding to large distances from the flag and eliminating the interactions between vortices detached from the leading edge at the cycle extremities They found that the flags undergo large-amplitude flapping regardless – a prediction not yet verified experimentally, which is, one of the objectives of the present paper. The above-referenced studies showed that VIV is not always the underlying mechanism for the large-amplitude flapping of inverted flags, they did not put forward an alternative physical explanation Motivated by this gap in knowledge, Tavallaeinejad [14, 15] developed mathematical models for small-aspect-ratio and two-dimensional heavy inverted flags, i.e.
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