Preprint Article Version 1 This version is not peer-reviewed

The Efficient Application of an Impulse Source Wavemaker to CFD Simulations

Version 1 : Received: 21 January 2019 / Approved: 22 January 2019 / Online: 22 January 2019 (12:09:25 CET)

A peer-reviewed article of this Preprint also exists.

Schmitt, P.; Windt, C.; Davidson, J.; Ringwood, J.V.V.; Whittaker, T. The Efficient Application of an Impulse Source Wavemaker to CFD Simulations. J. Mar. Sci. Eng. 2019, 7, 71. Schmitt, P.; Windt, C.; Davidson, J.; Ringwood, J.V.V.; Whittaker, T. The Efficient Application of an Impulse Source Wavemaker to CFD Simulations. J. Mar. Sci. Eng. 2019, 7, 71.

Journal reference: J. Mar. Sci. Eng. 2019, 7, 71
DOI: 10.3390/jmse7030071

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 opensource CFD software OpenFOAM, for wave packets in deep and shallow water, highlighting the correct calibration of phase and amplitude. Also, 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 good application is given.

Subject Areas

numerical wave tank; internal wavemaker; CFD ; wave generation; OpenFOAM

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