Experimental study on flow around horizontal multiple pipelines laid on the erodible seabed surface

In flume experiments, turbulent flow characteristics around horizontal pipes were investigated in four different arrangements: single pipe, two pipes with a spacing of 0.5 D , two pipes with a spacing of D , and three pipes with a spacing of 0.5 D . The flow velocity around the pipes at close distan...

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Veröffentlicht in:Journal of ocean engineering and marine energy 2024-08, Vol.10 (3), p.555-571
Hauptverfasser: Kolahdouzan, Fereshteh, Afzalimehr, Hossein, Siadatmousavi, Seyed Mostafa, Yagci, Oral
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Sprache:eng
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Zusammenfassung:In flume experiments, turbulent flow characteristics around horizontal pipes were investigated in four different arrangements: single pipe, two pipes with a spacing of 0.5 D , two pipes with a spacing of D , and three pipes with a spacing of 0.5 D . The flow velocity around the pipes at close distances was measured using an Acoustic Doppler Velocimeter (ADV), and turbulent flow parameters, such as Reynolds stresses, turbulence intensity, and the turbulence indicator ( I ), were calculated. The variations of these parameters with the scour depth underneath the pipes were also examined for each arrangement. The results indicate that the number of pipelines greatly controls the flow domain. In the wake region of the single pipe, there is a higher increase in Reynolds stresses, momentum transfer, turbulent flow, and vortices intensity compared to the other arrangements, leading to a greater scour depth in this case (0.52 D ). In the arrangement with two pipes at a spacing of D , there is a significant increase in Reynolds stresses in the spacing between the pipes, and counter-rotating vortices in this region cause a greater scour depth (0.41 D ) compared to the arrangement with 0.5 D pipe spacing (0.37 D ). In addition, the lowest scour depth, as well as the least increase in Reynolds stresses and turbulent flow intensity, was observed in the three-pipe case when the pipe spacing was 0.5 D . The maximum I values for experiments 1–4 in the wake region and between the pipes are I  ≈ 0.48, I  ≈ 0.34, I  ≈ 0.38, and I  ≈ 0.36, respectively. This shows that the turbulence level in these regions can be classified as moderate.
ISSN:2198-6444
2198-6452
DOI:10.1007/s40722-024-00329-x