Analysis of Flexible Plate Motion Based on Co-Simulation of STAR-CCM + and ABAQUS

Vibration damping of a plate by means of a fluid layer is investigated. First, the frequency-dependent flow resistance of a fluid layer is explained with a simple illustration of the damping mechanism. Then, the vibration response of a plate is examined when it is backed by a rigid plane or another flexible plate with a fluid layer constricted in-between. Effects of the plate motion and acoustic radiation on the damping mechanism are also considered. The numerical results are presented in terms of frequency response of the plates.

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Wave Interaction and Overwash with a Flexible Plate by Smoothed Particle Hydrodynamics

Water ◽

10.3390/w12123354 ◽

2020 ◽

Vol 12 (12) ◽

pp. 3354 ◽

Cited By ~ 2

Author(s):

Thien Tran-Duc ◽

Michael H. Meylan ◽

Ngamta Thamwattana ◽

Bishnu P. Lamichhane

Keyword(s):

Elastic Plate ◽

Smoothed Particle Hydrodynamics ◽

Fluid Motion ◽

Wave Interaction ◽

Fluid Flows ◽

Plate Motion ◽

Flexible Plate ◽

Mesh Free ◽

Particle Hydrodynamics ◽

Smoothed Particle

The motion of a flexible elastic plate under wave action is simulated, and the well–known phenomena of overwash is investigated. The fluid motion is modelled by smoothed particle hydrodynamics, a mesh-free solution method which, while computationally demanding, is flexible and able to simulate complex fluid flows. The freely floating plate is modelled using linear thin plate elasticity plus the nonlinear rigid body motions. This assumption limits the elastic plate motion to be small but is valid for many cases both in geophysics and in the laboratory. The principal conclusion is that the inclusion of flexural motion causes significantly less overwash than that which occurs for a rigid plate.

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Thermal Cooling Enhancements in a Heated Channel Using Flow-Induced Motion

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4052986 ◽

2021 ◽

pp. 1-39

Author(s):

Mayank Verma ◽

Ashoke De

Keyword(s):

Cross Sections ◽

Plate Motion ◽

Flexible Plate ◽

Power Requirement ◽

Partitioned Approach ◽

Heated Channel ◽

Induced Motion ◽

Convection Problem ◽

The Comparative Study ◽

Thermal Cooling

Abstract The paper presents the comparative study of the vortex-induced cooling of a heated channel for the four different cross-sections of the rigid cylinder, i.e., circular, square, semi-circular, and triangular, with or without the rigid/flexible splitter plate at the Reynolds number (based on the hydraulic diameter) of 200. The study presents a comprehensive analysis of the flow and thermal performance for all the cases. For flexible plate cases, a partitioned approach is invoked to solve the coupled fluid-structure-convection problem. The simulations show the reduction in the thermal boundary layer thickness at the locations of the vortices resulting in the improved Nusselt number. Further, the thin plate's flow-induced motion significantly increases the vorticity field inside the channel, resulting in improved mixing and cooling. It is observed that the plate-motion amplitude is maximum when the plate is attached to the cylinder with the triangular cross-section. The power requirement analysis shows that the flexible plate reduces the power required to pump the channel's cold fluid. Thus, based on the observations of the present study, the authors recommend using the flexible plate attached to the cylinder for improved convective cooling.

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Large-Amplitude Oscillations of a Finite-Thickness Cantilevered Flexible Plate in Viscous Channel Flow

ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise: Volume 3, Parts A and B ◽

10.1115/fedsm-icnmm2010-30438 ◽

2010 ◽

Cited By ~ 2

Author(s):

Novak S. J. Elliott ◽

Anthony D. Lucey ◽

Matthias Heil

Keyword(s):

Soft Palate ◽

Solid Mechanics ◽

Structural Model ◽

Finite Thickness ◽

Plane Channel ◽

Finite Amplitude ◽

Plate Motion ◽

Flexible Plate ◽

Single Plane ◽

Analogue System

The broad aim of the present work is to elucidate mechanisms of obstructive breathing disorders (snoring, sleep apnea) in which flow-induced instabilities of the soft palate feature. We use the well-established analogue system model wherein a two-dimensional flexible plate (soft palate) is mounted downstream of a rigid surface that separates upper and lower plane channel (oral and nasal tracts) flows that interact with the plate motion and then combine into a single plane channel (pharynx) flow. For this system, we take the next step towards biomechanical realism by modeling finite-amplitude motions of the flexible plate and incorporating finite thickness in its structure. The structural model makes use of a geometrically nonlinear formulation of the solid mechanics. Viscous flow is modeled at Reynolds numbers giving unsteady laminar flow. The fully-coupled fluid-structure interaction (FSI) model is developed using the open-source finite-element library oomph–lib. We first show the effects of finite amplitude and finite thickness on the in-vacuo modes of the plate through a validation study of the structural mechanics. Thereafter, we use the FSI model to illustrate both stable and unstable motions of the plate. Overall, this paper demonstrates the versatility of the new modeling approach and its suitability for characterizing the dependence of the plate’s stability on the system parameters.

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Dynamics of fluid flow over a circular flexible plate

Journal of Fluid Mechanics ◽

10.1017/jfm.2014.571 ◽

2014 ◽

Vol 759 ◽

pp. 56-72 ◽

Cited By ~ 26

Author(s):

Ru-Nan Hua ◽

Luoding Zhu ◽

Xi-Yun Lu

Keyword(s):

Fluid Flow ◽

Plate Motion ◽

Immersed Boundary ◽

Flexible Plate ◽

Fluid Structure ◽

Structure System ◽

Elastic Potential Energy ◽

Boltzmann Method ◽

Deformation Patterns ◽

Deformation Modes

AbstractThe dynamics of viscous fluid flow over a circular flexible plate are studied numerically by an immersed boundary–lattice Boltzmann method for the fluid flow and a finite-element method for the plate motion. When the plate is clamped at its centre and placed in a uniform flow, it deforms by the flow-induced forces exerted on its surface. A series of distinct deformation modes of the plate are found in terms of the azimuthal fold number from axial symmetry to multifold deformation patterns. The developing process of deformation modes is analysed and both steady and unsteady states of the fluid–structure system are identified. The drag reduction due to the plate deformation and the elastic potential energy of the flexible plate are investigated. Theoretical analysis is performed to elucidate the deformation characteristics. The results obtained in this study provide physical insight into the understanding of the mechanisms on the dynamics of the fluid–structure system.

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