An innovative concept of booster for OMNI-Max anchor

Li, Jun; Han, Congcong; Zhang, Yuqin; Ma, Yueyuan; Hu, Yuxia

doi:10.1016/j.apor.2018.05.007

Cited by 15 publications

(3 citation statements)

References 40 publications

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“…The boosterassisted fish anchor achieves a final velocity of approximately 28 m/s when falling over a distance of about 8 L, which is slightly higher than the impact velocity observed for the conventional fish anchor without booster (i.e., around 25 m/s at installation inclination angles below 9 ) and the OMNI-Max anchor's impact velocity (i.e., approximately 23 m/s, Shelton, 2007). Furthermore, the impact velocity of the booster-assisted fish anchor does not significantly differ from that of the OMNI-Max anchor with booster proposed by Liu et al (2018), and it is smaller than that of the T98 torpedo anchor (i.e., roughly 38 m/s when falling over a distance of about 8L, .…”

Section: Anchor Impact Velocitymentioning

confidence: 65%

“…The presence of the booster results in the drag coefficient of approximately 0.5 for the booster-assisted fish anchor, which is roughly twice that of the fish anchor without a booster and comparable to the torpedo anchor. However, it is smaller than in the case of both the OMNI-Max anchor (i.e., 0.76-1.0, Han and Liu, 2020) and the OMNI-Max anchor with a booster proposed by Liu et al (2018) (i.e., $1.05, Liu et al, 2019.…”

Section: E Drag Coefficientmentioning

confidence: 93%

“…According to the experiment in Liu et al (2018), the addition of a booster behind the OMNI-Max anchor (Fig. 5) has been found to effectively enhance both its directional stability and penetration depth.…”

Section: B Concept and Directional Stability Of The Innovative Booste...mentioning

confidence: 99%

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An innovative booster-assisted dynamically installed fish anchor and its installation characteristics considering the action of ocean currents

Zhang,

2024

Physics of Fluids

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The fish anchor is an economically viable offshore foundation engineering technology that has been proposed in recent years. By fish anchor, we mean a fish-shaped dynamically installed anchor that can penetrate into the seabed through water by its own weight. However, the existing research studies seldom consider the hydrodynamic characteristics of its free fall installation, resulting in uncertainties regarding its underwater installation characteristics. Therefore, based on OpenFOAM, this study first investigated the directional stability of fish anchors during its underwater falling process through the static model analysis method and dynamic model analysis method. The findings indicated that the directional stability of fish anchors was insufficient, rendering them suitable only for release and installation at low heights (i.e., less than 4.2 times the anchor length) without marine environmental loads. Furthermore, the anchor inclination angle during installation is significant, thereby impacting its penetration depth and pull-out capacity in the seabed. To solve this problem, the concept of an innovative booster-assisted fish anchor is proposed, which can significantly enhance the directional stability of conventional fish anchors. Results show that the maximum installation height of the new booster-assisted fish anchor is increased by 2.4 times compared to the original design, thereby enhancing both the penetration speed and uplift capacity. Based on the findings, recommended installation and construction conditions are provided. Finally, a predictive formula for the installation height and verticality of the new booster-assisted fish anchor under current action is presented to offer guidance for engineering applications.

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Section: Anchor Impact Velocitymentioning

confidence: 65%

Section: E Drag Coefficientmentioning

confidence: 93%