Generation of free-surface waves by localized source terms in the continuity equation

Perić, Robinson; Abdel‐Maksoud, Moustafa

doi:10.1016/j.oceaneng.2015.08.030

Cited by 26 publications

(23 citation statements)

References 18 publications

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“…For many scientific or industrial applications, wavemakers with sophisticated theoretical solutions are used, although transient time traces require calibration, practically making the details of the wavemaker transfer function irrelevant and even creating an unnecessary overhead [23]. Applying a calibrated two-dimensional result to a corresponding three-dimensional domain is efficient and is also the recommended approach by Perić and Abdel-Maksoud [24].…”

Section: Impulse Source Wavemakermentioning

confidence: 99%

The Efficient Application of an Impulse Source Wavemaker to CFD Simulations

Schmitt

Windt

Davidson

et al. 2019

JMSE

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Computational Fluid Dynamics (CFD) simulations, based on Reynolds-AveragedNavier–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 inputwaves in the CFD simulation is performed by a Numerical Wavemaker (NWM), with a variety ofdifferent NWM methods existing for this task. While NWMs, based on impulse source methods, havebeen widely applied for wave generation in depth averaged, shallow water models, they have notseen the same level of adoption in the more general RANS-based CFD simulations, due to difficultiesin relating the required impulse source function to the resulting free surface elevation for non-shallowwater cases. This paper presents an implementation of an impulse source wavemaker, which is ableto self-calibrate the impulse source function to produce a desired wave series in deep or shallowwater at a specific point in time and space. Example applications are presented, for a NumericalWave Tank (NWT), based on the open-source CFD software OpenFOAM, for wave packets in deepand shallow water, highlighting the correct calibration of phase and amplitude. Furthermore, thesuitability for cases requiring very low reflection from NWT boundaries is demonstrated. Possibleissues in the use of the method are discussed, and guidance for accurate application is given.

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Section: Impulse Source Wavemakermentioning

confidence: 99%

The Efficient Application of an Impulse Source Wavemaker to CFD Simulations

Schmitt

Windt

Davidson

et al. 2019

JMSE

View full text Add to dashboard Cite

show abstract

“…A third method is to embed the wavemaker within the model domain with the addition of sponge layers for wave damping at the boundaries (e.g., Larsen and Dancy, 1983;Wei et al, 1999;Lin and Liu, 1999;Lara et al, 2006). The method has been used in both Boussinesqtype (e.g., Wei et al, 1999;Schäffer and Sørensen, 2006;Kim et al, 2007;Liam et al, 2014) and RANS models (e.g., Lin and Liu, 1999;Hafsia et al, 2009;Perić and Abdel-Maksoud, 2015) and avoids the complication of both generating and absorbing waves at a boundary. Internal wavemakers first generated waves on a single line (cross-shore delta function) source (Larsen and Dancy, 1983), which continues to be used in Boussinesq models (e.g., Schäffer and Sørensen, 2006;Kim et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a source-function wavemaker for generating random directionally spread waves in the sea-swell band

Suanda

Pérez

Feddersen

2016

Coastal Engineering

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A source-function wavemaker for wave-resolving models is evaluated for its capability to reproduce random directionally spread wave fields in the sea-swell band (0.04-0.3 Hz) relevant for realistic nearshore applications. The wavemaker is tested with a range of input wave characteristics defined by the non-dimensional amplitude (a/h), wavenumber (kh), wavemaker width, mean wave angle and directional spread. The a/h and kh dependency of modeled results are collapsed with the Ursell number (Ur = (a/h)/(kh) 2). For monochromatic waves, the wavemaker accurately reproduced the input wave height for Ur < 1, with no dependence on nondimensional wavemaker width. For random uni-directional waves, the wavemaker simulated well a Pierson-Moskowitz input spectrum. Frequency-integrated statistics are also reproduced with less than 2% difference between modeled to input significant wave height and < 10% difference between modeled to input mean frequency for Ur < 0.2. For random directionally spread waves, the wavemaker reproduced input frequency-dependent and bulk mean wave angle and directional spread to within 4 • at Ur < 0.12. Lastly, the wavemaker simulated well the spectra, mean wave angle, and directional spread of a bimodal wave field with opposing sea and swell. Based on the Ur < 0.12 constraint, a range of dimensional wave height, period, and depth constraints are explored for realistic sea-swell band field application. The wavemaker's ability to generate waves that match the input statistical properties commonly derived from field measurements demonstrates that it can be used effectively in a range of nearshore science and engineering applications.

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“…For wave generation, five different methods are well known: the Relaxation Zone Method (RZM) [34,40,41], Static (SBM) and Dynamic Boundary Method (DBM) [9,42], Mass Source Method (MSM) [43,44] and Impulse Source Method (ISM) [45][46][47][48]. For numerical wave absorption, six different methods are available, i.e., the RZM, SBM, DBM, Numerical Beach (NB) implementations [2,49], geometrically sloped beaches [50][51][52] and the cell stretching method [53].…”

Section: Methodsmentioning

confidence: 99%

On the Assessment of Numerical Wave Makers in CFD Simulations

Windt

Davidson

Schmitt

et al. 2019

JMSE

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A fully non-linear numerical wave tank (NWT), based on Computational Fluid Dynamics (CFD), provides a useful tool for the analysis of coastal and offshore engineering problems. To generate and absorb free surface waves within a NWT, a variety of numerical wave maker (NWM) methodologies have been suggested in the literature. Therefore, when setting up a CFD-based NWT, the user is faced with the task of selecting the most appropriate NWM, which should be driven by a rigorous assessment of the available methods. To provide a consistent framework for the quantitative assessment of different NWMs, this paper presents a suite of metrics and methodologies, considering three key performance parameters: accuracy, computational requirements and available features. An illustrative example is presented to exemplify the proposed evaluation metrics, applied to the main NWMs available for the open source CFD software, OpenFOAM. The considered NWMs are found to reproduce waves with an accuracy comparable to real wave makers in physical wave tank experiments. However, the paper shows that significant differences are found between the various NWMs, and no single method performed best in all aspects of the assessment across the different test cases.

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Generation of free-surface waves by localized source terms in the continuity equation

Cited by 26 publications

References 18 publications

The Efficient Application of an Impulse Source Wavemaker to CFD Simulations

The Efficient Application of an Impulse Source Wavemaker to CFD Simulations

Evaluation of a source-function wavemaker for generating random directionally spread waves in the sea-swell band

On the Assessment of Numerical Wave Makers in CFD Simulations

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