A bi-directional coupling of 2D shallow water and 3D Reynolds-averaged Navier-Stokes models

A parallelized numerical coupling between shallow water equations and Reynolds-averaged Navier-Stokes equations is presented. The coupling is implemented via a bi-directional exchange of flow variables at the interfaces between shallow water and Reynolds equations, thus allowing for the computation...

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Bibliographic Details
Published in:Journal of hydraulic research Vol. 56; no. 6; pp. 771 - 785
Main Authors: Mintgen, Florian, Manhart, Michael
Format: Journal Article
Language:English
Published: Madrid Taylor & Francis 02.11.2018
Taylor & Francis Ltd
Subjects:
Computation
Computational fluid dynamics
Computer simulation
Coupling
flood modelling
Flood waves
Fluid flow
Interfaces
Mathematical models
Navier-Stokes equations
Parallel processing
RANS models
Reynolds averaged Navier-Stokes method
shallow flows
Shallow water
Shallow water equations
Shallow water waves
Simulation
streams and rivers
Submarines
Three dimensional models
Two dimensional models
Water waves
ISSN:0022-1686, 1814-2079
Online Access:Get full text
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Summary:A parallelized numerical coupling between shallow water equations and Reynolds-averaged Navier-Stokes equations is presented. The coupling is implemented via a bi-directional exchange of flow variables at the interfaces between shallow water and Reynolds equations, thus allowing for the computation of unsteady phenomena such as flood waves. Several test cases are conducted, in which coupled simulations are compared to both shallow water simulations and Reynolds-averaged Navier-Stokes simulations. It is shown that shallow water waves traverse the interface between both regions without significant distortion. For a complex scenario of a flood wave approaching an obstacle, it is demonstrated that the method is computationally efficient and that it is stable and accurate even in cases where basic assumptions of the shallow water equations are violated.
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ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2017.1419989