CCP-WSI Blind Test Series 3: CFD-based numerical wave tank experiments employing an impulse source wave maker

Christian Windt, Josh Davidson, Pal Schmitt, John V. Ringwood

Research output: Contribution to journalArticle

Abstract

During the development and optimisation of wave energy converters, numerical wave tanks are useful tools, providing detailed insight into the hydro- dynamic performance of devices. Specifically, CFD-based numerical wave tanks (CNWTs) can deliver high-fidelity, high resolution, results for a wide range of test conditions. However, CNWTs come at significant computational cost and require more man-hours during model setup, compared to lower- fidelity, frequency domain based models. The computational costs can only be significantly decreased by improving the numerical solvers, or increased expenditure on computational power. The required man-hours for the model setup, however, can be reduced by streamlining the setup of CNWTs. To this end, the formulation of best-practice guidelines can expedite this streamlining. A step towards such best-practice guidelines are blind tests. This paper presents the CNWT, used for the authors’ contribution to the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 3. In the employed numerical wave tanks, a self-calibrating impulse source wave maker, recently developed by Schmitt et al. (2019), is implemented for wave generation. In addition to the numerical results, and the comparison with the recently disclosed experimental data, the paper presents the spatial and temporal convergence studies, as well as results for the numerical wave maker calibration. The numerical results show average deviations with the experimental data of < 10%. Furthermore, a correlation between the accuracy of the numerical replication of the wave and the agreement between numerical and experimental device motion is highlighted.
Original languageEnglish
JournalInternational Journal of Offshore and Polar Engineering
Publication statusAccepted - 05 Nov 2019

Fingerprint

Computational fluid dynamics
Experiments
Costs
Calibration

Keywords

  • Wave Energy, CCP-WSI Blind Test, Impulse wave maker, CFD, numerical wave tank, OpenFOAM, RANS

Cite this

@article{7b7c8ce4135a429f9858feaf62b5486a,
title = "CCP-WSI Blind Test Series 3: CFD-based numerical wave tank experiments employing an impulse source wave maker",
abstract = "During the development and optimisation of wave energy converters, numerical wave tanks are useful tools, providing detailed insight into the hydro- dynamic performance of devices. Specifically, CFD-based numerical wave tanks (CNWTs) can deliver high-fidelity, high resolution, results for a wide range of test conditions. However, CNWTs come at significant computational cost and require more man-hours during model setup, compared to lower- fidelity, frequency domain based models. The computational costs can only be significantly decreased by improving the numerical solvers, or increased expenditure on computational power. The required man-hours for the model setup, however, can be reduced by streamlining the setup of CNWTs. To this end, the formulation of best-practice guidelines can expedite this streamlining. A step towards such best-practice guidelines are blind tests. This paper presents the CNWT, used for the authors’ contribution to the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 3. In the employed numerical wave tanks, a self-calibrating impulse source wave maker, recently developed by Schmitt et al. (2019), is implemented for wave generation. In addition to the numerical results, and the comparison with the recently disclosed experimental data, the paper presents the spatial and temporal convergence studies, as well as results for the numerical wave maker calibration. The numerical results show average deviations with the experimental data of < 10{\%}. Furthermore, a correlation between the accuracy of the numerical replication of the wave and the agreement between numerical and experimental device motion is highlighted.",
keywords = "Wave Energy, CCP-WSI Blind Test, Impulse wave maker, CFD, numerical wave tank, OpenFOAM, RANS",
author = "Christian Windt and Josh Davidson and Pal Schmitt and Ringwood, {John V.}",
year = "2019",
month = "11",
day = "5",
language = "English",
journal = "International Journal of Offshore and Polar Engineering",
issn = "1053-5381",
publisher = "International Society of Offshore and Polar Engineers",

}

CCP-WSI Blind Test Series 3: CFD-based numerical wave tank experiments employing an impulse source wave maker. / Windt, Christian; Davidson, Josh; Schmitt, Pal; Ringwood, John V.

In: International Journal of Offshore and Polar Engineering, 05.11.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CCP-WSI Blind Test Series 3: CFD-based numerical wave tank experiments employing an impulse source wave maker

AU - Windt, Christian

AU - Davidson, Josh

AU - Schmitt, Pal

AU - Ringwood, John V.

PY - 2019/11/5

Y1 - 2019/11/5

N2 - During the development and optimisation of wave energy converters, numerical wave tanks are useful tools, providing detailed insight into the hydro- dynamic performance of devices. Specifically, CFD-based numerical wave tanks (CNWTs) can deliver high-fidelity, high resolution, results for a wide range of test conditions. However, CNWTs come at significant computational cost and require more man-hours during model setup, compared to lower- fidelity, frequency domain based models. The computational costs can only be significantly decreased by improving the numerical solvers, or increased expenditure on computational power. The required man-hours for the model setup, however, can be reduced by streamlining the setup of CNWTs. To this end, the formulation of best-practice guidelines can expedite this streamlining. A step towards such best-practice guidelines are blind tests. This paper presents the CNWT, used for the authors’ contribution to the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 3. In the employed numerical wave tanks, a self-calibrating impulse source wave maker, recently developed by Schmitt et al. (2019), is implemented for wave generation. In addition to the numerical results, and the comparison with the recently disclosed experimental data, the paper presents the spatial and temporal convergence studies, as well as results for the numerical wave maker calibration. The numerical results show average deviations with the experimental data of < 10%. Furthermore, a correlation between the accuracy of the numerical replication of the wave and the agreement between numerical and experimental device motion is highlighted.

AB - During the development and optimisation of wave energy converters, numerical wave tanks are useful tools, providing detailed insight into the hydro- dynamic performance of devices. Specifically, CFD-based numerical wave tanks (CNWTs) can deliver high-fidelity, high resolution, results for a wide range of test conditions. However, CNWTs come at significant computational cost and require more man-hours during model setup, compared to lower- fidelity, frequency domain based models. The computational costs can only be significantly decreased by improving the numerical solvers, or increased expenditure on computational power. The required man-hours for the model setup, however, can be reduced by streamlining the setup of CNWTs. To this end, the formulation of best-practice guidelines can expedite this streamlining. A step towards such best-practice guidelines are blind tests. This paper presents the CNWT, used for the authors’ contribution to the Collaborative Computational Project in Wave Structure Interaction Blind Test Series 3. In the employed numerical wave tanks, a self-calibrating impulse source wave maker, recently developed by Schmitt et al. (2019), is implemented for wave generation. In addition to the numerical results, and the comparison with the recently disclosed experimental data, the paper presents the spatial and temporal convergence studies, as well as results for the numerical wave maker calibration. The numerical results show average deviations with the experimental data of < 10%. Furthermore, a correlation between the accuracy of the numerical replication of the wave and the agreement between numerical and experimental device motion is highlighted.

KW - Wave Energy, CCP-WSI Blind Test, Impulse wave maker, CFD, numerical wave tank, OpenFOAM, RANS

M3 - Article

JO - International Journal of Offshore and Polar Engineering

JF - International Journal of Offshore and Polar Engineering

SN - 1053-5381

ER -