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Characterisation of flow regimes in the bow wave of a surface piercing cylinder
https://orcid.org/0000-0001-7989-9853
Abstract A series of tow tank experiments are performed to observe the free surface deformation around a surface piercing cylinder with 39mm diameter, at a range of Froude numbers . Particular attention is paid to the bow wave at the front of the cylinder and 6 distinct flow regimes are observed to appear as the velocity of the cylinder is increased, from the appearance of a steady hydraulic jump at the leading edge of the bow wave, progressing to a spilling and then plunging breaking wave. Time-resolved measurements of the height and upstream propagation distance of the bow wave are used to quantify the size and shape of the wave, with variations in the mean and fluctuating components of these measurements aligning with the observed transitions in the flow regime of the wave. Retrospective analysis of data from Hay (1947) is used to begin mapping the dependency of these flow regimes on the Froude, Weber, and Reynolds numbers. It is proposed that for such deep water flows, the Froude number could be defined using the largest wavelength of gravity waves produced at the bow (), such that the number would by definition represent the ratio of flow velocity to maximum gravity wave celerity, in agreement with the hydraulic analogy. This allows for the flow regime transition point at which the surface waves no longer travel upstream of the cylinder, to occur by definition at .
Highlights Tow tank experiments reveal 6 distinct flow regimes in the bow wave of a surface-piercing cylinder. Retrospective analysis of literature begins to map occurrence of regimes non-dimensionally. Quantitative data on bow wave characteristics presented, useful for validating numerical codes. Proposes a Froude number that is consistent with the hydraulic analogy.
Characterisation of flow regimes in the bow wave of a surface piercing cylinder
https://orcid.org/0000-0001-7989-9853
Abstract A series of tow tank experiments are performed to observe the free surface deformation around a surface piercing cylinder with 39mm diameter, at a range of Froude numbers . Particular attention is paid to the bow wave at the front of the cylinder and 6 distinct flow regimes are observed to appear as the velocity of the cylinder is increased, from the appearance of a steady hydraulic jump at the leading edge of the bow wave, progressing to a spilling and then plunging breaking wave. Time-resolved measurements of the height and upstream propagation distance of the bow wave are used to quantify the size and shape of the wave, with variations in the mean and fluctuating components of these measurements aligning with the observed transitions in the flow regime of the wave. Retrospective analysis of data from Hay (1947) is used to begin mapping the dependency of these flow regimes on the Froude, Weber, and Reynolds numbers. It is proposed that for such deep water flows, the Froude number could be defined using the largest wavelength of gravity waves produced at the bow (), such that the number would by definition represent the ratio of flow velocity to maximum gravity wave celerity, in agreement with the hydraulic analogy. This allows for the flow regime transition point at which the surface waves no longer travel upstream of the cylinder, to occur by definition at .
Highlights Tow tank experiments reveal 6 distinct flow regimes in the bow wave of a surface-piercing cylinder. Retrospective analysis of literature begins to map occurrence of regimes non-dimensionally. Quantitative data on bow wave characteristics presented, useful for validating numerical codes. Proposes a Froude number that is consistent with the hydraulic analogy.
Characterisation of flow regimes in the bow wave of a surface piercing cylinder
https://orcid.org/0000-0001-7989-9853
Abstract A series of tow tank experiments are performed to observe the free surface deformation around a surface piercing cylinder with 39mm diameter, at a range of Froude numbers . Particular attention is paid to the bow wave at the front of the cylinder and 6 distinct flow regimes are observed to appear as the velocity of the cylinder is increased, from the appearance of a steady hydraulic jump at the leading edge of the bow wave, progressing to a spilling and then plunging breaking wave. Time-resolved measurements of the height and upstream propagation distance of the bow wave are used to quantify the size and shape of the wave, with variations in the mean and fluctuating components of these measurements aligning with the observed transitions in the flow regime of the wave. Retrospective analysis of data from Hay (1947) is used to begin mapping the dependency of these flow regimes on the Froude, Weber, and Reynolds numbers. It is proposed that for such deep water flows, the Froude number could be defined using the largest wavelength of gravity waves produced at the bow (), such that the number would by definition represent the ratio of flow velocity to maximum gravity wave celerity, in agreement with the hydraulic analogy. This allows for the flow regime transition point at which the surface waves no longer travel upstream of the cylinder, to occur by definition at .
Highlights Tow tank experiments reveal 6 distinct flow regimes in the bow wave of a surface-piercing cylinder. Retrospective analysis of literature begins to map occurrence of regimes non-dimensionally. Quantitative data on bow wave characteristics presented, useful for validating numerical codes. Proposes a Froude number that is consistent with the hydraulic analogy.
Characterisation of flow regimes in the bow wave of a surface piercing cylinder
Keough, Shannon J (author) / Ooi, Andrew (author) / Philip, Jimmy (author) / Monty, Jason P (author)
Applied Ocean Research ; 145
2024-02-15
Article (Journal)
Electronic Resource
English
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