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A TRANSITION-LOSS THEORY FOR WAVES REFLECTED AND TRANSMITTED BY AN OVERWASHED BODY.

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Title: A TRANSITION-LOSS THEORY FOR WAVES REFLECTED AND TRANSMITTED BY AN OVERWASHED BODY.
Authors: SKENE, DAVID M.1 david.skene@adelaide.edu.au, BENNETTS, LUKE G.2 luke.bennetts@adelaide.edu.au
Source: SIAM Journal on Applied Mathematics. 2021, Vol. 81 Issue 3, p834-852. 19p.
Subjects: Potential flow, Conservation of energy, Wave energy, Energy dissipation, Hydraulic jump, Mechanical energy
Abstract: A transition-loss theory for waves reflected by an overwashed step and transmitted by an overwashed plate is presented. The theory is based on a conservation of energy technique to correct the transmission/reflection predicted by linear potential flow theory by taking into account the energy flux into the overwash and the mechanical energy dissipated by the formation of overwash. Wave energy dissipation is calculated by assuming that the transition from deep water to shallow water flow occurs over a sufficiently narrow domain such that it can be modeled as a discontinuity in the flow (akin to a hydraulic jump). Theoretical predictions are compared to CFD model data for the step problem and laboratory experimental measurements for the plate problem. Generally, excellent agreement is found for all cases tested, and the theory gives significant improvements compared to linear models that do not capture overwash effects and a theory that does not account for energy loss in the transition domain. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A transition-loss theory for waves reflected by an overwashed step and transmitted by an overwashed plate is presented. The theory is based on a conservation of energy technique to correct the transmission/reflection predicted by linear potential flow theory by taking into account the energy flux into the overwash and the mechanical energy dissipated by the formation of overwash. Wave energy dissipation is calculated by assuming that the transition from deep water to shallow water flow occurs over a sufficiently narrow domain such that it can be modeled as a discontinuity in the flow (akin to a hydraulic jump). Theoretical predictions are compared to CFD model data for the step problem and laboratory experimental measurements for the plate problem. Generally, excellent agreement is found for all cases tested, and the theory gives significant improvements compared to linear models that do not capture overwash effects and a theory that does not account for energy loss in the transition domain. [ABSTRACT FROM AUTHOR]
ISSN:00361399
DOI:10.1137/20M1386979