Flow Structure Interaction of a Dam-Break Wave Impinging on Flexible Plate
Abstract
STATEMENT OF WORK – SUITABLE FOR PUBLIC RELEASE Flow Structure Interaction of a Dam-Break Wave Impinging on Flexible Plate PI: Techet, Alexandra H. MIT Department of Mechanical Engineering The goal of this effort is to analyze the data for the flow structure interactions between a rapidly advancing fluid wave and a vertical, flexible plate. The fluid wave will be a hydraulic jump-type wave generated by a simulated dam break in a tank. The flow will impinge on a cantilevered flexible wall. Advanced high-speed imaging will be combined with emerging three-dimensional light-field imaging techniques, using a high speed imaging array, to map flow characteristics, including fluid velocities, free surface elevation and run-up on the plate, and deformation motion of the plate, to develop models and validate numerical codes. Digital image correlation (DIC) will be used to assess plate bending. DIC will be calibrated using strain gages mounted to the plate. Data gathered from DIC will be input into standard beam bending equations to determine load distribution on the plate as a function of time. Challenges include obtaining bending data with sufficient resolution and accuracy to resolve forcing. 2D Particle Imaging Velocity (PIV) and Synthetic aperture (SA) imaging techniques will be used, based on the light-field imaging concept. Light field imaging (LFI) involves sampling a large number of light rays from a scene, using a camera array with 9-25 cameras, to allow for scene reparameterization using synthetic aperture refocusing. By reparameterizing the light field, one can focus on arbitrary focal planes throughout the scene and “see-through” partial occlusions. Technical Objectives 1. Digital image correlation of the plate bending; calibrated with strain gage data. 2. Relocation of flexible plate closer to reservoir exit. 3. Pressure sensor array testing on the flexible plate 4. High-speed time series of water run-up on flexible plate downstream of reservoir 5. 2D PIV on advancing wave near impact zone 6. Continued high (spatial) resolution, high speed particle image velocimetry (2D) of flow velocities near impact and near gate where possible. 7. Preliminary 3D SAPIV in near plate region. Data for selected cases will be made available to researchers working on similar computational and structural efforts. Full geometric specifications of the facility will be provided to other researchers upon request. Final report will be made available upon request.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512695
Entities
People
- Alexandra H Techet
Organizations
- Massachusetts Institute of Technology
- Office of Naval Research
- United States Navy