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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Three dimensional cfd modeling of flow around an owc wave energy converter
Three dimensional cfd modeling of flow around an owc wave energy converter
Author : ARUN KAMATH(1), HANS BIHS(2) & ŘIVIND A. ARNTSEN(3)
ABSTRACT
An Oscillating Water Column (OWC) device is a wave energy converter that can be deployed in shallow coastal waters
to convert incident wave energy into electrical energy. The installation of an OWC device in the coastal region has
consequences on the waves incident on the coast as it reduces the energy content of the waves that are headed towards
the coastline. It can be used to meet dual objectives of generating clean energy and also coastal protection. In this
scenario, the flow around an OWC device has an influence on the coastal dynamics and on the performance of the
device itself. Thus, it is essential to obtain a good understanding of the influence of installing an OWC device in a
coastal environment. This paper uses a CFD model to investigate the hydrodynamics of an OWC device placed in a
numerical wave tank and study the flow features around the device. The free surface motion inside the chamber, velocity
of the free surface motion and the chamber pressure are studied. A 2D simulation is first carried out and the numerical
results are compared with experimental observations. Further, 3D simulations are carried out and difference in the
hydrodynamics of the device in 3D simulations in comparison to 2D simulations is studied. This provides insight into the
hydrodynamics of the device taking into account the effect of the side walls and the interaction of the device with the
incident waves in a realistic environment.
The numerical model uses the Reynolds-Averaged Navier-Stokes equations to solve the fluid flow problem. The 5thorder
conservative finite difference WENO scheme is used to discretize the convective terms and a 3rd-order TVD
Runge-Kutta scheme is employed for time advancement. Pressure discretization is carried out using Chorin’s projection
method and the Poisson pressure equation is solved using a pre-conditioned BiCGStab algorithm. A sharp
representation of the free surface is obtained using the level set method. Turbulence modeling is carried out using the k-
ω model. Computational performance of the numerical model is improved by parallel processing using the MPI library.
File Size : 3,936,423 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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