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Fluid-Structural Coupling Mechanisms in the High-Speed Aeroelastic Behavior of a Cantilever Plate /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fluid-Structural Coupling Mechanisms in the High-Speed Aeroelastic Behavior of a Cantilever Plate // Jordan David Thayer.
Author:	Thayer, Jordan David,
Description:	1 electronic resource (258 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
Contained By:	Dissertations Abstracts International86-04B.
Subject:	Aerospace engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31674372
ISBN:	9798384088837

Fluid-Structural Coupling Mechanisms in the High-Speed Aeroelastic Behavior of a Cantilever Plate /
Thayer, Jordan David,

Fluid-Structural Coupling Mechanisms in the High-Speed Aeroelastic Behavior of a Cantilever Plate /Jordan David Thayer. - 1 electronic resource (258 pages)

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

A major challenge in the development of high-speed flight vehicles is understanding, managing, and controlling the impact of an extreme operating environment. Fluid-structural interactions (FSI) are an important and challenging concern due to need for optimal weight and multi-functional structures, juxtaposed with the possibility of catastrophic failure and degradation of vehicle performance. Conditions where strong coupling arises between compliant structures and multi-scale fluid dynamic features characteristic to the flight environment, such as turbulence, shock motions, and flow separation, are not sufficiently understood. This challenges a priori model fidelity selection for accurate and efficient prediction of FSI, directly impacting development of high-speed vehicles.This dissertation seeks to address these open questions through studying the interaction between a high-speed, separating turbulent flow field and a compliant cantilever plate. The main features of the flow are separation at the end of the plate and reattachment on the downstream floor, which are modulated by shear layer instabilities and interaction with the cavity underneath the plate. Wall-resolved large eddy simulations (LES) are applied to capture interaction with the multi-scale flow field. Companions predictions are also made with unsteady Reynolds-averaged Navier-Stokes (URANS) and local piston theory (LPT) in order to contextualize the significance of interaction with the inherent flow unsteadiness.The interaction with the flow field is first examined through prescribed oscillations of the cantilever. The flow response to varying amplitude motions in the first bending mode as well as combined bending-torsional motion is explored. Here, the oscillation frequency is set to align with the characteristic low-frequency unsteadiness in the underside recirculation region. Then, the potential for energy transfer between high-frequency structural modes to the shear layer is explored through low-amplitude oscillation at a frequency on the order of the shear layer scales. A key finding from this initial investigation is the reasonable prediction of generalized aerodynamic forces by low-fidelity fluid models relative to LES, indicating their potential suitability for broader study of the aeroelastic behavior of the cantilever.Coupled interactions with the flow field are then studied by first leveraging the reduced computational cost of URANS and LPT. Due to the open cavity underneath the plate, a large-amplitude static aeroelastic response arises as the nondimensional dynamic pressure increases, which is readily predicted by LPT. Structural-induced cavity pressure fluctuations are found to have an important effect on dynamic aeroelastic behavior of the cantilever. Additionally, shock-induced flow separation arises on the top surface of the cantilever due to interaction with the off-body flow field, which gives rise to the post-flutter limit cycle oscillation (LCO) rather than nonlinearity in the structure. Notably, both of these coupling mechanisms are not readily captured within the framework of LPT, indicating its unreliability for prediction of dynamic aeroelastic behavior of the cantilever.Finally, the role of the inherent turbulence within the coupled interaction is explored by applying LES. Notably, an amplified response, modal coalescence, and shock-induced flow separation arise for a condition beyond the URANS-predicted flutter bifurcation point. The importance of capturing dynamic feedback between the turbulence and structural compliance is evaluated through response prediction comparisons with URANS. Here, the URANS wall pressure prediction is superimposed with an LES-informed turbulent load extracted from static states of the cantilever. The overall aeroelastic behavior of the cantilever is predicted reasonably well by URANS in conjunction with an LES-informed turbulent load. However, error is still present in the URANS response prediction relative to LES, which may be due to the neglect of dynamic feedback with the turbulence.

English

ISBN: 9798384088837Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

Flow separation

Fluid-Structural Coupling Mechanisms in the High-Speed Aeroelastic Behavior of a Cantilever Plate /
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520 $a A major challenge in the development of high-speed flight vehicles is understanding, managing, and controlling the impact of an extreme operating environment. Fluid-structural interactions (FSI) are an important and challenging concern due to need for optimal weight and multi-functional structures, juxtaposed with the possibility of catastrophic failure and degradation of vehicle performance. Conditions where strong coupling arises between compliant structures and multi-scale fluid dynamic features characteristic to the flight environment, such as turbulence, shock motions, and flow separation, are not sufficiently understood. This challenges a priori model fidelity selection for accurate and efficient prediction of FSI, directly impacting development of high-speed vehicles.This dissertation seeks to address these open questions through studying the interaction between a high-speed, separating turbulent flow field and a compliant cantilever plate. The main features of the flow are separation at the end of the plate and reattachment on the downstream floor, which are modulated by shear layer instabilities and interaction with the cavity underneath the plate. Wall-resolved large eddy simulations (LES) are applied to capture interaction with the multi-scale flow field. Companions predictions are also made with unsteady Reynolds-averaged Navier-Stokes (URANS) and local piston theory (LPT) in order to contextualize the significance of interaction with the inherent flow unsteadiness.The interaction with the flow field is first examined through prescribed oscillations of the cantilever. The flow response to varying amplitude motions in the first bending mode as well as combined bending-torsional motion is explored. Here, the oscillation frequency is set to align with the characteristic low-frequency unsteadiness in the underside recirculation region. Then, the potential for energy transfer between high-frequency structural modes to the shear layer is explored through low-amplitude oscillation at a frequency on the order of the shear layer scales. A key finding from this initial investigation is the reasonable prediction of generalized aerodynamic forces by low-fidelity fluid models relative to LES, indicating their potential suitability for broader study of the aeroelastic behavior of the cantilever.Coupled interactions with the flow field are then studied by first leveraging the reduced computational cost of URANS and LPT. Due to the open cavity underneath the plate, a large-amplitude static aeroelastic response arises as the nondimensional dynamic pressure increases, which is readily predicted by LPT. Structural-induced cavity pressure fluctuations are found to have an important effect on dynamic aeroelastic behavior of the cantilever. Additionally, shock-induced flow separation arises on the top surface of the cantilever due to interaction with the off-body flow field, which gives rise to the post-flutter limit cycle oscillation (LCO) rather than nonlinearity in the structure. Notably, both of these coupling mechanisms are not readily captured within the framework of LPT, indicating its unreliability for prediction of dynamic aeroelastic behavior of the cantilever.Finally, the role of the inherent turbulence within the coupled interaction is explored by applying LES. Notably, an amplified response, modal coalescence, and shock-induced flow separation arise for a condition beyond the URANS-predicted flutter bifurcation point. The importance of capturing dynamic feedback between the turbulence and structural compliance is evaluated through response prediction comparisons with URANS. Here, the URANS wall pressure prediction is superimposed with an LES-informed turbulent load extracted from static states of the cantilever. The overall aeroelastic behavior of the cantilever is predicted reasonably well by URANS in conjunction with an LES-informed turbulent load. However, error is still present in the URANS response prediction relative to LES, which may be due to the neglect of dynamic feedback with the turbulence.
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653 $a Local piston theory
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