The Experts below are selected from a list of 2028 Experts worldwide ranked by ideXlab platform

Greaves D - One of the best experts on this subject based on the ideXlab platform.

  • Quantifying the predictive capability of OpenFOAM 5.0: Focused wave impacts with floating bodies
    'International Society of Offshore and Polar Engineers', 2020
    Co-Authors: Brown S, Ransley E, Musiedlak P, Greaves D
    Abstract:

    Indefinite embargo applies.This work concerns the quantification of numerical accuracy for focused wave interactions with floating structures, using results obtained via a commonly used CFD and linear wave superposition approach. It represents an individual contribution to the CCP-WSI Blind Test Series 3, where numerical predictions for a structure’s motion are submitted for comparison with physical data, without prior access to this data. An estimation of accuracy based on the reproduction of physical Empty Tank data, and previous experience, is compared with the observed error in the structure’s motion. The results imply that the error in peak values of heave and Empty Tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, although numerical uncertainty must also be reduced in order to fully assess the problem

  • CCP-WSI Blind Test Series 2: Assessment of focused wave impacts on floating WECs using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Greaves D
    Abstract:

    The presented work represents an individual contribution to the CCP-WSI Blind Test Series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation setup, and hence reducing the required man-hours, through standardised `best practice' procedures. Therefore, in the absence of validation data, the scope of this study is to provide a `blind' estimation of numerical accuracy in simulations of focused wave interactions with floating wave energy converters (WECs). The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. Based solely on the reproduction of the known Empty Tank data, the numerical predictions are estimated to be within 10% of the experimental data in peak motion and mooring loads

  • Numerical Investigation of Focused Wave Impacts on Floating Wave Energy Converters Using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This work concerns focused wave interactions with floating structures and represents an individual contribution to the CCP-WSI Blind Test Series 3, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness. The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. A `blind' estimation of error is presented, thought to be 10% or less in peak motion and mooring loads

  • Numerical simulation of focused wave interactions with a fixed FPSO using OpenFOAM 4.1
    Sapporo Japan, 2018
    Co-Authors: Sa Brown, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This paper presents numerical results utilising the open-source C++ libraries of OpenFOAM (Foundation version 4.1) to simulate the interaction of focused wave events with a fixed FPSO-like structure. The Reynolds-Averaged Navier Stokes (RANS) equations are solved using a finite volume approach for two, incompressible, fluids using a volume of fluid (VOF) interface capturing scheme. Wave generation and absorption is achieved via linear superposition of first order wave components, derived from the Empty Tank data, and the relaxation zone method from the waves2Foam toolbox. Various wave steepness, ranging from ka = 0.13 to 0.21, and incident wave angles, 0, 10 and 20_, are considered. The effect of turbulence is also evaluated through use of the k-ω SST turbulence closure model. The wave run-up and the pressure on the surface of the structure are examined and have been contributed for comparison with both physical and alternative numerical data as part of the CCP-WSI Blind Test Series 1

Brown S - One of the best experts on this subject based on the ideXlab platform.

  • Quantifying the predictive capability of OpenFOAM 5.0: Focused wave impacts with floating bodies
    'International Society of Offshore and Polar Engineers', 2020
    Co-Authors: Brown S, Ransley E, Musiedlak P, Greaves D
    Abstract:

    Indefinite embargo applies.This work concerns the quantification of numerical accuracy for focused wave interactions with floating structures, using results obtained via a commonly used CFD and linear wave superposition approach. It represents an individual contribution to the CCP-WSI Blind Test Series 3, where numerical predictions for a structure’s motion are submitted for comparison with physical data, without prior access to this data. An estimation of accuracy based on the reproduction of physical Empty Tank data, and previous experience, is compared with the observed error in the structure’s motion. The results imply that the error in peak values of heave and Empty Tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, although numerical uncertainty must also be reduced in order to fully assess the problem

  • Quantifying the Predictive Capability of OpenFOAM 4.1: Focused Wave Interactions with a Fixed FPSO
    'International Society of Offshore and Polar Engineers', 2019
    Co-Authors: Brown S, Musiedlak P-h, Ej Ransley, Dm Greaves
    Abstract:

    Numerical simulations of focused wave interactions with a fixed FPSO-like structure are presented, representing an individual contribution to the CCPWSI Blind Test Series 1 in which they are compared against both physical and alternative numerical solutions. The model is based in OpenFOAM with wave generation achieved via linear superposition of first order wave components, derived from the Empty Tank data. This work focuses on comparing the ‘blind’ estimation of accuracy, based on reproduction of physical Empty Tank data (released prior to submission to the blind test), with the observed error in wave run-up and pressure on the bow of the structure (following the release of the complete physical data set). The results imply that achieving a good reproduction of surface elevation based on the Empty Tank data does not necessarily correlate with good agreement when a structure is present

  • CCP-WSI Blind Test Series 2: Assessment of focused wave impacts on floating WECs using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Greaves D
    Abstract:

    The presented work represents an individual contribution to the CCP-WSI Blind Test Series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation setup, and hence reducing the required man-hours, through standardised `best practice' procedures. Therefore, in the absence of validation data, the scope of this study is to provide a `blind' estimation of numerical accuracy in simulations of focused wave interactions with floating wave energy converters (WECs). The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. Based solely on the reproduction of the known Empty Tank data, the numerical predictions are estimated to be within 10% of the experimental data in peak motion and mooring loads

  • Numerical Investigation of Focused Wave Impacts on Floating Wave Energy Converters Using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This work concerns focused wave interactions with floating structures and represents an individual contribution to the CCP-WSI Blind Test Series 3, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness. The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. A `blind' estimation of error is presented, thought to be 10% or less in peak motion and mooring loads

Dm Greaves - One of the best experts on this subject based on the ideXlab platform.

  • Assessing focused wave impacts on floating wave energy converters using OpenFOAM
    'Thomas Telford Ltd.', 2021
    Co-Authors: Sa Brown, Ej Ransley, Dm Greaves
    Abstract:

    This study considers focused wave interactions with floating wave energy converters and represents an individual contribution to the CCP-WSI blind test series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation set-up, and hence reduce the required man-hours, through standardised 'best practice' procedures. In order to achieve this, it is essential that the limitations of a numerical tool are well understood, and minimised. Therefore, this study aims to quantify the numerical reproduction of the focused wave event, and the motion of two different geometries predicted using a commonly used CFD methodology with waves generation achieved by way of linear superposition. The results imply that the error in peak values of heave and Empty Tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, which must be addressed in future study

  • Quantifying the Predictive Capability of OpenFOAM 4.1: Focused Wave Interactions with a Fixed FPSO
    'International Society of Offshore and Polar Engineers', 2019
    Co-Authors: Brown S, Musiedlak P-h, Ej Ransley, Dm Greaves
    Abstract:

    Numerical simulations of focused wave interactions with a fixed FPSO-like structure are presented, representing an individual contribution to the CCPWSI Blind Test Series 1 in which they are compared against both physical and alternative numerical solutions. The model is based in OpenFOAM with wave generation achieved via linear superposition of first order wave components, derived from the Empty Tank data. This work focuses on comparing the ‘blind’ estimation of accuracy, based on reproduction of physical Empty Tank data (released prior to submission to the blind test), with the observed error in wave run-up and pressure on the bow of the structure (following the release of the complete physical data set). The results imply that achieving a good reproduction of surface elevation based on the Empty Tank data does not necessarily correlate with good agreement when a structure is present

Ransley E - One of the best experts on this subject based on the ideXlab platform.

  • Quantifying the predictive capability of OpenFOAM 5.0: Focused wave impacts with floating bodies
    'International Society of Offshore and Polar Engineers', 2020
    Co-Authors: Brown S, Ransley E, Musiedlak P, Greaves D
    Abstract:

    Indefinite embargo applies.This work concerns the quantification of numerical accuracy for focused wave interactions with floating structures, using results obtained via a commonly used CFD and linear wave superposition approach. It represents an individual contribution to the CCP-WSI Blind Test Series 3, where numerical predictions for a structure’s motion are submitted for comparison with physical data, without prior access to this data. An estimation of accuracy based on the reproduction of physical Empty Tank data, and previous experience, is compared with the observed error in the structure’s motion. The results imply that the error in peak values of heave and Empty Tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, although numerical uncertainty must also be reduced in order to fully assess the problem

  • CCP-WSI Blind Test Series 2: Assessment of focused wave impacts on floating WECs using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Greaves D
    Abstract:

    The presented work represents an individual contribution to the CCP-WSI Blind Test Series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation setup, and hence reducing the required man-hours, through standardised `best practice' procedures. Therefore, in the absence of validation data, the scope of this study is to provide a `blind' estimation of numerical accuracy in simulations of focused wave interactions with floating wave energy converters (WECs). The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. Based solely on the reproduction of the known Empty Tank data, the numerical predictions are estimated to be within 10% of the experimental data in peak motion and mooring loads

  • Numerical Investigation of Focused Wave Impacts on Floating Wave Energy Converters Using OpenFOAM
    2019
    Co-Authors: Brown S, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This work concerns focused wave interactions with floating structures and represents an individual contribution to the CCP-WSI Blind Test Series 3, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness. The present numerical results are obtained using open-source CFD with waves generated via linear superposition of first order wave components, derived from Empty Tank data. Two geometries are considered and the effect of wave steepness on surge, heave and pitch motion, along with the load in the mooring, is examined. A `blind' estimation of error is presented, thought to be 10% or less in peak motion and mooring loads

  • Numerical simulation of focused wave interactions with a fixed FPSO using OpenFOAM 4.1
    Sapporo Japan, 2018
    Co-Authors: Sa Brown, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This paper presents numerical results utilising the open-source C++ libraries of OpenFOAM (Foundation version 4.1) to simulate the interaction of focused wave events with a fixed FPSO-like structure. The Reynolds-Averaged Navier Stokes (RANS) equations are solved using a finite volume approach for two, incompressible, fluids using a volume of fluid (VOF) interface capturing scheme. Wave generation and absorption is achieved via linear superposition of first order wave components, derived from the Empty Tank data, and the relaxation zone method from the waves2Foam toolbox. Various wave steepness, ranging from ka = 0.13 to 0.21, and incident wave angles, 0, 10 and 20_, are considered. The effect of turbulence is also evaluated through use of the k-ω SST turbulence closure model. The wave run-up and the pressure on the surface of the structure are examined and have been contributed for comparison with both physical and alternative numerical data as part of the CCP-WSI Blind Test Series 1

Sa Brown - One of the best experts on this subject based on the ideXlab platform.

  • Assessing focused wave impacts on floating wave energy converters using OpenFOAM
    'Thomas Telford Ltd.', 2021
    Co-Authors: Sa Brown, Ej Ransley, Dm Greaves
    Abstract:

    This study considers focused wave interactions with floating wave energy converters and represents an individual contribution to the CCP-WSI blind test series 2, in which the submitted results are compared against both physical and alternative numerical solutions for varying wave steepness achieved through changes in peak frequency. Reducing the time taken to provide reliable results is critical if computational fluid dynamics (CFD) is to become a routine design tool for offshore renewable energy devices. This can potentially be achieved by simplifying simulation set-up, and hence reduce the required man-hours, through standardised 'best practice' procedures. In order to achieve this, it is essential that the limitations of a numerical tool are well understood, and minimised. Therefore, this study aims to quantify the numerical reproduction of the focused wave event, and the motion of two different geometries predicted using a commonly used CFD methodology with waves generation achieved by way of linear superposition. The results imply that the error in peak values of heave and Empty Tank surface elevation are comparable, but the peak surge and pitch are substantially larger. This is likely due to a combination of numerical modelling errors, which must be addressed in future study

  • Numerical simulation of focused wave interactions with a fixed FPSO using OpenFOAM 4.1
    Sapporo Japan, 2018
    Co-Authors: Sa Brown, Ransley E, Musiedlak P-h, Greaves D
    Abstract:

    This paper presents numerical results utilising the open-source C++ libraries of OpenFOAM (Foundation version 4.1) to simulate the interaction of focused wave events with a fixed FPSO-like structure. The Reynolds-Averaged Navier Stokes (RANS) equations are solved using a finite volume approach for two, incompressible, fluids using a volume of fluid (VOF) interface capturing scheme. Wave generation and absorption is achieved via linear superposition of first order wave components, derived from the Empty Tank data, and the relaxation zone method from the waves2Foam toolbox. Various wave steepness, ranging from ka = 0.13 to 0.21, and incident wave angles, 0, 10 and 20_, are considered. The effect of turbulence is also evaluated through use of the k-ω SST turbulence closure model. The wave run-up and the pressure on the surface of the structure are examined and have been contributed for comparison with both physical and alternative numerical data as part of the CCP-WSI Blind Test Series 1