Hydrodynamic forces on intermittently spanning pipelines in steady currents

Yunfei Teng, Liang Cheng, Hongwei An, Feifei Tong, Terry Griffiths, Wei Sun, Jiawei Chi, Zhijian Xiong

Research output: Chapter in Book/Conference paperConference paper

1 Citation (Scopus)

Abstract

Experimental investigations on the hydrodynamic forces on an intermittently spanning pipeline exposed to steady currents were carried out. The effect of intermittent local spanning sections on the global hydrodynamic behavior was studied by changing the ratio between the non-spanning length (B) and the total length (L), namely the blocking ratio B / L. A range of gap height (G) to diameter (D) ratios, i.e. gap ratio G / D, and 4 different Reynolds numbers (Re) in the subcritical region were tested in the experiments. The results show: i) for a certain gap ratio, the mean drag increases gently with the decreasing blocking ratio at Re = 5.5 × 104, whereas the mean lift decreases significantly with the decreasing blocking ratio at all values of Re tested; and ii) for a certain blocking ratio, increasing the gap ratio leads to an increase in mean drag and decrease in mean lift. Further, simple approaches are proposed based on the present dataset for estimating the global effects on hydrodynamic drag and lift forces due to local spanning geometry.

Original languageEnglish
Title of host publicationOffshore Technology; Offshore Geotechnics
PublisherThe American Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858769
DOIs
Publication statusPublished - 1 Jan 2019
EventASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 - Glasgow, United Kingdom
Duration: 9 Jun 201914 Jun 2019

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume1

Conference

ConferenceASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019
CountryUnited Kingdom
CityGlasgow
Period9/06/1914/06/19

Fingerprint

Drag
Hydrodynamics
Pipelines
Reynolds number
Geometry
Experiments

Cite this

Teng, Y., Cheng, L., An, H., Tong, F., Griffiths, T., Sun, W., ... Xiong, Z. (2019). Hydrodynamic forces on intermittently spanning pipelines in steady currents. In Offshore Technology; Offshore Geotechnics (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 1). The American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2019-95585
Teng, Yunfei ; Cheng, Liang ; An, Hongwei ; Tong, Feifei ; Griffiths, Terry ; Sun, Wei ; Chi, Jiawei ; Xiong, Zhijian. / Hydrodynamic forces on intermittently spanning pipelines in steady currents. Offshore Technology; Offshore Geotechnics. The American Society of Mechanical Engineers (ASME), 2019. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE).
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abstract = "Experimental investigations on the hydrodynamic forces on an intermittently spanning pipeline exposed to steady currents were carried out. The effect of intermittent local spanning sections on the global hydrodynamic behavior was studied by changing the ratio between the non-spanning length (B) and the total length (L), namely the blocking ratio B / L. A range of gap height (G) to diameter (D) ratios, i.e. gap ratio G / D, and 4 different Reynolds numbers (Re) in the subcritical region were tested in the experiments. The results show: i) for a certain gap ratio, the mean drag increases gently with the decreasing blocking ratio at Re = 5.5 × 104, whereas the mean lift decreases significantly with the decreasing blocking ratio at all values of Re tested; and ii) for a certain blocking ratio, increasing the gap ratio leads to an increase in mean drag and decrease in mean lift. Further, simple approaches are proposed based on the present dataset for estimating the global effects on hydrodynamic drag and lift forces due to local spanning geometry.",
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Teng, Y, Cheng, L, An, H, Tong, F, Griffiths, T, Sun, W, Chi, J & Xiong, Z 2019, Hydrodynamic forces on intermittently spanning pipelines in steady currents. in Offshore Technology; Offshore Geotechnics. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, vol. 1, The American Society of Mechanical Engineers (ASME), ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019, Glasgow, United Kingdom, 9/06/19. https://doi.org/10.1115/OMAE2019-95585

Hydrodynamic forces on intermittently spanning pipelines in steady currents. / Teng, Yunfei; Cheng, Liang; An, Hongwei; Tong, Feifei; Griffiths, Terry; Sun, Wei; Chi, Jiawei; Xiong, Zhijian.

Offshore Technology; Offshore Geotechnics. The American Society of Mechanical Engineers (ASME), 2019. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 1).

Research output: Chapter in Book/Conference paperConference paper

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AU - Teng, Yunfei

AU - Cheng, Liang

AU - An, Hongwei

AU - Tong, Feifei

AU - Griffiths, Terry

AU - Sun, Wei

AU - Chi, Jiawei

AU - Xiong, Zhijian

PY - 2019/1/1

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N2 - Experimental investigations on the hydrodynamic forces on an intermittently spanning pipeline exposed to steady currents were carried out. The effect of intermittent local spanning sections on the global hydrodynamic behavior was studied by changing the ratio between the non-spanning length (B) and the total length (L), namely the blocking ratio B / L. A range of gap height (G) to diameter (D) ratios, i.e. gap ratio G / D, and 4 different Reynolds numbers (Re) in the subcritical region were tested in the experiments. The results show: i) for a certain gap ratio, the mean drag increases gently with the decreasing blocking ratio at Re = 5.5 × 104, whereas the mean lift decreases significantly with the decreasing blocking ratio at all values of Re tested; and ii) for a certain blocking ratio, increasing the gap ratio leads to an increase in mean drag and decrease in mean lift. Further, simple approaches are proposed based on the present dataset for estimating the global effects on hydrodynamic drag and lift forces due to local spanning geometry.

AB - Experimental investigations on the hydrodynamic forces on an intermittently spanning pipeline exposed to steady currents were carried out. The effect of intermittent local spanning sections on the global hydrodynamic behavior was studied by changing the ratio between the non-spanning length (B) and the total length (L), namely the blocking ratio B / L. A range of gap height (G) to diameter (D) ratios, i.e. gap ratio G / D, and 4 different Reynolds numbers (Re) in the subcritical region were tested in the experiments. The results show: i) for a certain gap ratio, the mean drag increases gently with the decreasing blocking ratio at Re = 5.5 × 104, whereas the mean lift decreases significantly with the decreasing blocking ratio at all values of Re tested; and ii) for a certain blocking ratio, increasing the gap ratio leads to an increase in mean drag and decrease in mean lift. Further, simple approaches are proposed based on the present dataset for estimating the global effects on hydrodynamic drag and lift forces due to local spanning geometry.

KW - Blocking Ratio

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Teng Y, Cheng L, An H, Tong F, Griffiths T, Sun W et al. Hydrodynamic forces on intermittently spanning pipelines in steady currents. In Offshore Technology; Offshore Geotechnics. The American Society of Mechanical Engineers (ASME). 2019. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE). https://doi.org/10.1115/OMAE2019-95585