Scholarly
    Communications Project


Document Type:Master's Thesis
Name:Kristen Mary Lowery
Email address:klowery@vt.edu
URN:1997/00563
Title:Dynamic Analysis of an Inflatable Dam Subjected to a Flood
Degree:Master of Science
Department:Aerospace and Ocean Engineering
Committee Chair: Dr. Stergios Liapis
Chair's email:sliapis@shellus.com
Committee Members:Dr. Raymond Plaut, Co-chair
Dr. Eric Johnson
Dr. Wayne Neu
Keywords:Inflatable dam, flood, CFD, FEM, free surface flow, waves, wave breaking, ABAQUS
Date of defense:December 5, 1997
Availability:Release the entire work for Virginia Tech access only.
After one year release worldwide only with written permission of the student and the advisory committee chair.

Abstract:

A dynamic simulation of the response of an inflatable dam subjected to a flood was carried out to determine the survivability envelope of the dam where it can operate without rupture, or overflow. A fully nonlinear free-surface flow was applied in two dimensions using a mixed Eulerian-Lagrangian formulation. An ABAQUS finite element model was used to determine the dynamic structural response of the dam. The problem was solved in the time domain which allows the prediction of a number of transient phenomena such as the generation of upstream advancing waves, and dynamic structural collapse. Stresses in the dam material were monitored to determine when rupture occurs. An iterative study was performed to find the service envelope of the dam in terms of the internal pressure and the flood Froude number for two flood depths. It was found that the driving parameter governing failure of the dam was the internal pressure. If this pressure is too low, the dam overflows; if this pressure is too high, the dam ruptures. The fully nonlinear free-surface flow over a semi-circular bottom obstruction was studied numerically in two dimensions using a similar solution formulation as that used in the previous study. A parametric study was performed for a range of values of the depth-based Froude number up to 2.5 and non- dimensional obstacle heights up to 0.9. When wave breaking does not occur, three distinct flow regimes were identified: subcritical, transcritical and supercritical. When breaking occurs it may be of any type: spilling, plunging or surging. In addition, for values of the Froude number close to 1, the upstream solitary waves break. A systematic study was undertaken, to define the boundaries of each type of breaking and non-breaking pattern, and to determine the drag and lift coefficients, free surface profile characteristics and transient behavior.

List of Attached Files

ETD.PDF ETD.PDF~ ETD.bak
FIGURE_I-1.PDF FIGURE_I-10.PDF FIGURE_I-11.PDF
FIGURE_I-12.PDF FIGURE_I-13.PDF FIGURE_I-14.PDF
FIGURE_I-15.PDF FIGURE_I-2.PDF FIGURE_I-3.PDF
FIGURE_I-4.PDF FIGURE_I-5.JPG FIGURE_I-6.PDF
FIGURE_I-7.PDF FIGURE_I-8.JPG FIGURE_I-9.PDF
FIGURE_II-1.PDF FIGURE_II-10.PDF FIGURE_II-11.PDF
FIGURE_II-12.PDF FIGURE_II-13.PDF FIGURE_II-14.PDF
FIGURE_II-15.PDF FIGURE_II-2.PDF FIGURE_II-3.PDF
FIGURE_II-4.PDF FIGURE_II-5.PDF FIGURE_II-6.PDF
FIGURE_II-7.PDF FIGURE_II-8.PDF FIGURE_II-9.PDF

At the author's request, all materials (PDF files, images, etc.) associated with this ETD are accessible from the Virginia Tech network only.


The author grants to Virginia Tech or its agents the right to archive and display their thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. The author retains all proprietary rights, such as patent rights. The author also retains the right to use in future works (such as articles or books) all or part of this thesis or dissertation.