The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Di, Felice F. - One of the best experts on this subject based on the ideXlab platform.

  • Detailed analysis of the wake of a DP thruster emphasizing comparison between LDV and SPIV techniques
    2006
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the Bollard Pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.Peer reviewed: YesNRC publication: Ye

  • Experimental analysis of the near wake from a ducted thruster at true and near Bollard Pull conditions using stereo particle image velocimetry (SPIV)
    2005
    Co-Authors: El Lababidy S., Bose N., Liu P., Walker D., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster's wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [Bollard Pull (J=0), J=0.4 and J=0.45].Peer reviewed: YesNRC publication: Ye

  • Evaluation of a dynamic positioning thruster wake using stereoscopic particle image velocimetry
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of thrusters wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster far wake velocity components at different downstream axial planes, up to 15 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel. These experiments were carried out at two different advance coefficient (J) values [Bollard Pull (J = 0), and J = 0.4].NRC publication: Ye

  • Experimental analysis of the wake from a dynamic positioning thruster
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F., Felli M.
    Abstract:

    The knowledge of the effects of the wakes from Dynamic Positioning (DP) thrusters and the practical need to describe and predict their impact is fundamental in the assessment of design loading on slipstream-submerged equipment associated with offshore floating systems. In particular, with the increasing importance and application of DP thrusters in the offshore industry, the designer as well as the operator must have more information about the momentum in the wake from the thruster. This paper presents wake measurements from cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, DP thruster wake velocity components at different downstream axial planes were obtained experimentally using a Stereo Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel, up to 15 diameters downstream. These experiments were carried out with and without the nozzle in the Bollard Pull condition. This paper presents the results from these tests and discusses their importance for structures placed in the slipstream.NRC publication: Ye

Liu P. - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic positioning thruster near wake hydrodynamic characteristics at near Bollard Pull
    Society of Naval Architects and Marine Engineers, 2009
    Co-Authors: El Lababidy S. A., Bose N., Liu P., Walker D.
    Abstract:

    The knowledge of the hydrodynamic characteristics and momentum effects of the flow of dynamic positioning (DP) thrusters are important factors in the design of structures around the DP thrusters and in improving DP system reliability. In the present study, the flow field around a DP thruster model was precisely measured in a cavitation tunnel using a two-component laser Doppler velocimetry (LDV) system. These experiments were carried out with and without a nozzle at three different axial planes up to 1.5 diameters downstream, and the results are presented here for a pitch/diameter ratio of 1.2 at near Bollard Pull operating conditions (J = 0.4 and J = 0.45). This paper shows and compares the results of the DP thruster near wake hydrodynamic and momentum characteristics when operating with and without a nozzle at two different low advance coefficient values.Peer reviewed: YesNRC publication: Ye

  • Detailed analysis of the wake of a DP thruster emphasizing comparison between LDV and SPIV techniques
    2006
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the Bollard Pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.Peer reviewed: YesNRC publication: Ye

  • Experimental analysis of the near wake from a ducted thruster at true and near Bollard Pull conditions using stereo particle image velocimetry (SPIV)
    2005
    Co-Authors: El Lababidy S., Bose N., Liu P., Walker D., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster's wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [Bollard Pull (J=0), J=0.4 and J=0.45].Peer reviewed: YesNRC publication: Ye

  • Experimental Analysis of the Near Wake from a Ducted Thruster at True and Near Bollard Pull Conditions Using Stereo Particle Image Velocimetry (SPIV)
    ASME, 2005
    Co-Authors: El Lababidy Said, Liu P., Walker D., Bose Neil, Di Felice Fabio
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems;shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster\u27s wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments,th e DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advanceoefficient sJd values [Bollard Pull sJ=0d, J=0.4 and J=0.45]

  • Evaluation of a dynamic positioning thruster wake using stereoscopic particle image velocimetry
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of thrusters wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster far wake velocity components at different downstream axial planes, up to 15 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel. These experiments were carried out at two different advance coefficient (J) values [Bollard Pull (J = 0), and J = 0.4].NRC publication: Ye

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

  • Detailed analysis of the wake of a DP thruster emphasizing comparison between LDV and SPIV techniques
    2006
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the Bollard Pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.Peer reviewed: YesNRC publication: Ye

  • Experimental analysis of the near wake from a ducted thruster at true and near Bollard Pull conditions using stereo particle image velocimetry (SPIV)
    2005
    Co-Authors: El Lababidy S., Bose N., Liu P., Walker D., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster's wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [Bollard Pull (J=0), J=0.4 and J=0.45].Peer reviewed: YesNRC publication: Ye

  • Evaluation of a dynamic positioning thruster wake using stereoscopic particle image velocimetry
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of thrusters wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster far wake velocity components at different downstream axial planes, up to 15 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel. These experiments were carried out at two different advance coefficient (J) values [Bollard Pull (J = 0), and J = 0.4].NRC publication: Ye

  • Experimental analysis of the wake from a dynamic positioning thruster
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F., Felli M.
    Abstract:

    The knowledge of the effects of the wakes from Dynamic Positioning (DP) thrusters and the practical need to describe and predict their impact is fundamental in the assessment of design loading on slipstream-submerged equipment associated with offshore floating systems. In particular, with the increasing importance and application of DP thrusters in the offshore industry, the designer as well as the operator must have more information about the momentum in the wake from the thruster. This paper presents wake measurements from cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, DP thruster wake velocity components at different downstream axial planes were obtained experimentally using a Stereo Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel, up to 15 diameters downstream. These experiments were carried out with and without the nozzle in the Bollard Pull condition. This paper presents the results from these tests and discusses their importance for structures placed in the slipstream.NRC publication: Ye

Bose N. - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic positioning thruster near wake hydrodynamic characteristics at near Bollard Pull
    Society of Naval Architects and Marine Engineers, 2009
    Co-Authors: El Lababidy S. A., Bose N., Liu P., Walker D.
    Abstract:

    The knowledge of the hydrodynamic characteristics and momentum effects of the flow of dynamic positioning (DP) thrusters are important factors in the design of structures around the DP thrusters and in improving DP system reliability. In the present study, the flow field around a DP thruster model was precisely measured in a cavitation tunnel using a two-component laser Doppler velocimetry (LDV) system. These experiments were carried out with and without a nozzle at three different axial planes up to 1.5 diameters downstream, and the results are presented here for a pitch/diameter ratio of 1.2 at near Bollard Pull operating conditions (J = 0.4 and J = 0.45). This paper shows and compares the results of the DP thruster near wake hydrodynamic and momentum characteristics when operating with and without a nozzle at two different low advance coefficient values.Peer reviewed: YesNRC publication: Ye

  • Detailed analysis of the wake of a DP thruster emphasizing comparison between LDV and SPIV techniques
    2006
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the Bollard Pull condition. In this paper, a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper.Peer reviewed: YesNRC publication: Ye

  • Experimental analysis of the near wake from a ducted thruster at true and near Bollard Pull conditions using stereo particle image velocimetry (SPIV)
    2005
    Co-Authors: El Lababidy S., Bose N., Liu P., Walker D., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster's wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [Bollard Pull (J=0), J=0.4 and J=0.45].Peer reviewed: YesNRC publication: Ye

  • Evaluation of a dynamic positioning thruster wake using stereoscopic particle image velocimetry
    2004
    Co-Authors: El Lababidy S., Bose N., Liu P., Di, Felice F.
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of thrusters wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster far wake velocity components at different downstream axial planes, up to 15 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system in the INSEAN cavitation tunnel. These experiments were carried out at two different advance coefficient (J) values [Bollard Pull (J = 0), and J = 0.4].NRC publication: Ye

  • Numerical investigation of propulsive characteristics of podded propeller
    2004
    Co-Authors: Islam M., Bose N., Taylor R., Quinton J., Veitch B., Colbourne D. B., Liu P.
    Abstract:

    Numerical investigations were performed to predict effects of propeller hub taper angle and pod geometry configurations on propulsive performance. An existing time domain panel method code was extended to handle the simulation tasks. The effect of taper angle was examined in terms of shaft thrust coefficient, KT, and torque coefficient, KQ, for different taper angles of -15\ub0 (Pull/tractor configuration) and +15\ub0 (push configuration). The predicted pressure distribution was also analyzed to investigate the effect of taper ratio on pressure coefficient, Cp, at the blade root section. The effects of pod-strut geometry on KT and KQ of a propeller with taper angles of 15\ub0 and 20\ub0 with two pods both in push configuration were examined. A complementary experimental study of the effects of taper angle on propulsive performance was also conducted for 15\ub0 and 20\ub0 taper angles in push configuration. Numerical predictions and experimental measurement showed a good agreement over a wide range of advance coefficients from the Bollard Pull condition to the design advance coefficient of about 1.0.NRC publication: Ye

Fabio De Felice - One of the best experts on this subject based on the ideXlab platform.

  • Detailed Analysis of the Wake of a DP Thruster Emphasizing Comparison Between LDV and SPIV Techniques
    Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2005
    Co-Authors: S El Lababidy, Neil Bose, Fabio De Felice
    Abstract:

    To provide experimental data on the hydrodynamic characteristics and features of dynamic positioning (DP) thrusters under variable operating conditions, wake measurements were performed on a DP thruster model using 2D laser Doppler velocimetry (LDV) and stereoscopic particle image velocimetry (SPIV). These tests were performed with and without a nozzle and over a range of advance coefficient values including the Bollard Pull condition. In this paper a detailed analysis of the hydrodynamic characteristics of the wake at a plane equal to a distance of 0.5 diameters downstream from the thruster, at advance coefficient values of 0, 0.4, and 0.45 are presented for both the LDV and SPIV measurements showing a comparison between the results of each technique. The effect of the duct and of changes in the advance coefficient values is presented in this paper. Copyright © 2006 by ASME.

  • Experimental analysis of the near wake from a ducted thruster at true and near Bollard Pull conditions using Stereo Particle Image Velocimetry (SPIV)
    Journal of Offshore Mechanics and Arctic Engineering-transactions of The Asme, 2005
    Co-Authors: S El Lababidy, Neil Bose, Dan Walker, Fabio De Felice
    Abstract:

    Thrusters working at low advance coefficients are employed in a wide range of offshore and marine applications on Floating, Production, Storage, and Offloading (FPSO) systems; shuttle tankers; tug boats; and mobile offshore units. Therefore, an understanding of the flow around the thrusters is of great practical interest. Despite this interest, there is lack of knowledge in the description of the hydrodynamic characteristics of a ducted thruster's wake at Bollard Pull and low advance coefficient values. This work was aimed at providing detailed data about the hydrodynamic characteristics of a Dynamic Positioning (DP) thruster near wake flow at different low advance coefficient values. Wake measurements were made during cavitation tunnel tests carried out on a ducted propeller model at the Italian Ship Model Basin (INSEAN), Rome, Italy. Through these experiments, the DP thruster near wake velocity components at different downstream axial planes, up to 1.5 diameters downstream, were obtained using a Stereoscopic Particle Image Velocimetry (SPIV) system. These experiments were carried out at different advance coefficient (J) values [Bollard Pull (J=0), J=0.4 and J=0.45]. Copyright © 2005 by ASME.