Schmitt, Pál and Windt, Christian and Davidson, Josh and Ringwood, John and Whittaker, Trevor (2019) The Efficient Application of an Impulse Source Wavemaker to CFD Simulations. Journal of Marine Science and Engineering, 7 (3). p. 71. ISSN 2077-1312

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Abstract

Computational Fluid Dynamics (CFD) simulations, based on Reynolds-Averaged Navier–Stokes (RANS) models, are a useful tool for a wide range of coastal and offshore applications, providing a high fidelity representation of the underlying hydrodynamic processes. Generating input waves in the CFD simulation is performed by a Numerical Wavemaker (NWM), with a variety of different NWM methods existing for this task. While NWMs, based on impulse source methods, have been widely applied for wave generation in depth averaged, shallow water models, they have not seen the same level of adoption in the more general RANS-based CFD simulations, due to difficulties in relating the required impulse source function to the resulting free surface elevation for non-shallow water cases. This paper presents an implementation of an impulse source wavemaker, which is able to self-calibrate the impulse source function to produce a desired wave series in deep or shallow water at a specific point in time and space. Example applications are presented, for a Numerical Wave Tank (NWT), based on the open-source CFD software OpenFOAM, for wave packets in deep and shallow water, highlighting the correct calibration of phase and amplitude. Furthermore, the suitability for cases requiring very low reflection from NWT boundaries is demonstrated. Possible issues in the use of the method are discussed, and guidance for accurate application is given.

Item Type:	Article
Additional Information:	©2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Cite as: J. Mar. Sci. Eng. 2019, 7(3), 71; https://doi.org/10.3390/jmse7030071 (This article belongs to the Special Issue Advances in Marine Dynamic Simulation). This work was supported by a research grant from the Department for the Economy Northern Ireland under the U.S.-Ireland R&D partnership program, Grant No. USI 081. Christian Windt’s Ph.D. is funded by Science Foundation Ireland under Grant No. 13/IA/1886. Josh Davidson is supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Water Science & Disaster Prevention research area of Budapest University of Technology and Economics (BME FIKP-VÍZ).
Keywords:	numerical wave tank; internal wavemaker; CFD; wave generation; OpenFOAM;
Academic Unit:	Faculty of Science and Engineering > Electronic Engineering Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
Item ID:	12392
Identification Number:	https://doi.org/10.3390/jmse7030071
Depositing User:	Professor John Ringwood
Date Deposited:	07 Feb 2020 12:56
Journal or Publication Title:	Journal of Marine Science and Engineering
Publisher:	MDPI
Refereed:	Yes
Funders:	Department for the Economy Northern Ireland, Science Foundation Ireland (SFI), Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Water Science & Disaster Prevention research area of Budapest University of Technology and Economics (BME FIKP-VÍZ)
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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