Applied Ocean Research最新文献

{"title":"Study on the effect and mechanism of hot-air-boosted vacuum preloading solidification of dredged silt via model tests","authors":"Yang Sun ,&nbsp;Faxin Wang ,&nbsp;Yifei Tang ,&nbsp;Lin Yang ,&nbsp;Sai Chen ,&nbsp;Qi Du ,&nbsp;Mingjuan Huang ,&nbsp;Qiu Zhai","doi":"10.1016/j.apor.2025.104684","DOIUrl":"10.1016/j.apor.2025.104684","url":null,"abstract":"<div><div>The traditional vacuum preloading method (TVP) is improved, and a “hot-air-boosted vacuum preloading (HAVP) method”, which combines vacuum preloading with hot gas injection into soil for heating, is proposed. The thermal‒mechanical coupling consolidation mechanism of dredged silt under the action of HAVP is discussed by selecting hot gas at 120 °C and 60 °C for a model test of hot gas pressurization, and process optimization is carried out by analyzing the measured data. The results show that HAVP can improve the soil settlement compared with TVP and that the settlement rate of the 120 °C group is better than that of the 60 °C group. A pressure of 20 kPa can achieve better consolidation, whereas a higher pressurization pressure has no obvious effect on the consolidation effect. After heating, the pore water pressure inside the soil increases, and the soil gradually rebounds during the heating process. The vacuum attenuation in the silt layer near the drainage plate is more uniform. In this test device, gas at 20 kPa and 120 °C is introduced, the influence range of the temperature in the horizontal direction is not more than 20 cm, and there is a more obvious warming phenomenon in the vertical direction at 60 cm, indicating that air flow can effectively increase the temperature of the soil. After HAVP, the gap between the soil particles is significantly reduced; the mechanism of hot gas pressurization is attributed to the combined effects of bubble disturbance, crack formation, additional pressure, and vacuum negative pressure reapplication.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104684"},"PeriodicalIF":4.3,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Brittle-to-ductile transition during rock cutting by chisel pick under deep-sea confining pressure","authors":"Zenghui Liu ,&nbsp;Rui Lv ,&nbsp;Xinlei Chen ,&nbsp;Xiao Wang ,&nbsp;Kai Liu ,&nbsp;Changyun Wei","doi":"10.1016/j.apor.2025.104683","DOIUrl":"10.1016/j.apor.2025.104683","url":null,"abstract":"<div><div>The advancement of deep-sea mineral extraction necessitates a comprehensive understanding of rock failure mode transitions under high confining pressures to optimize mining efficiency. This investigation systematically examines ductile-to-brittle failure transitions during rock cutting across a range of confining pressures, with particular emphasis on elucidating the relationship between critical transition cutting depth and confining pressure. Further investigation examines chip formation and crack propagation across different failure scenarios through a coupled finite discrete element-Euler method. The findings indicate that rock cutting is characterized by three distinct failure modes: ductile failure, ductile-brittle failure, and brittle failure. Each mode corresponds to the formation of specific chip morphologies—fine powder, flake-like chips, and chunk-like chips, respectively. Additionally, these modes align with three piecewise functions (<span><math><mrow><mi>S</mi><mi>E</mi><mo>∝</mo><msup><mrow><mi>d</mi></mrow><mn>0</mn></msup></mrow></math></span>, <span><math><mrow><mi>S</mi><mi>E</mi><mo>∝</mo><msup><mrow><mi>d</mi></mrow><mrow><mo>−</mo><mn>0.6</mn></mrow></msup></mrow></math></span>and <span><math><mrow><mi>S</mi><mi>E</mi><mo>∝</mo><msup><mrow><mi>d</mi></mrow><mrow><mo>−</mo><mn>1.1</mn></mrow></msup></mrow></math></span>) and distinct failure zones (the crushed zone, the plastic flow zone and the main failure zone). Notably, the critical transition cutting depth increases approximately linearly with confining pressure. As confining pressure rises, crack propagation diminishes, ultimately becoming confined to the region directly in front of the cutting tip. This study provides valuable insights into the development of low-disturbance and efficient mechanical rock-breaking techniques for deep-sea mining.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104683"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial-temporal correlation and fluctuating propagation characteristics of bubbles based on a coupled model of oscillation and migration","authors":"Zhipeng Ren ,&nbsp;Deyou Li ,&nbsp;Zifei Meng ,&nbsp;Niannian Liu ,&nbsp;Boo Cheong Khoo","doi":"10.1016/j.apor.2025.104677","DOIUrl":"10.1016/j.apor.2025.104677","url":null,"abstract":"<div><div>Bubble oscillation and migration are complex dynamic processes that have been extensively studied for the applications of ocean engineering. However, the intricate coupling and interactions among various parameters that affect bubble oscillation and migration remain unclear. In particular, the correlation between bubble dynamics and abrupt alterations in the flow field is not defined. Here, based on a developed bubble dynamics model, a spatial-temporal correlation method was applied to bubble calculations to build quantitative correlations among the bubble deformation, motion and characteristic pressures for the first time. Subsequently, the sharp changes in the flow field caused by bubble oscillation and migration behaviours were further explored to reveal the fluctuating propagation mechanism and instability in the flow field. The results indicated that increasing water depth and initial static pressure, along with decreasing bubble equilibrium radius and initial oscillation velocity, led to a higher bubble oscillation frequency. However, these factors reduced the duration of each migration process, resulting in a smaller total migration. Surface tension stands out as the preeminent factor exerting influence on both the migration displacement and the velocity. In contrast, the bubble wall serves as the principal determinant for the migration acceleration. Furthermore, the propagation of bubble dynamics is influenced by the combined effects of bubble growth, collapse, and migration. Pressure propagation correlates most strongly with bubble radius, followed by migration velocity and acceleration, while other parameters exhibit weaker correlations with pressure. This study emphasizes the bubble interaction mechanism and propagation characteristics.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104677"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigations on the VIV response of a deep-water drilling riser with buoyancy modules","authors":"Anu Sugathan,&nbsp;K.G. Vijay","doi":"10.1016/j.apor.2025.104650","DOIUrl":"10.1016/j.apor.2025.104650","url":null,"abstract":"<div><div>To reduce the effective submerged weight of deep-water drilling risers, buoyancy modules (BMs) are strategically installed at periodic intervals, predominantly near the upper section of the riser. The inclusion of BMs significantly influences the riser's vortex-induced vibration (VIV) response under challenging offshore environments. The present study comprehensively investigates the coupled crossflow (CF) and in-line (IL) VIV responses of a deep-water drilling riser with buoyancy modules subjected to linear shear flow. The governing equations of the coupled structural and wake oscillator are discretised and solved using the finite difference method of the second order, in both temporal and spatial domains. Both constant axial tension and depth-dependent variable tension models are evaluated, with results indicating that the constant tension assumption systematically overpredicts VIV amplitudes by approximately 5 % to 40 %, depending on flow and structural conditions. Furthermore, a parameter sensitivity analysis is conducted by varying key environmental factors, riser parameters and operational parameters. The primary VIV response metrics are assessed and compared, including root-mean-square (RMS) displacement amplitudes in both IL and CF directions, vibration mode envelopes, and temporal displacement histories. The results reveal that increased flow velocities intensify modal excitation, leading to enhanced IL and CF vibration amplitudes. Conversely, elevated top tension ratios and increased riser wall thickness are shown to suppress vibration amplitudes by approximately 9 % to 22 %. Additionally, specific combinations of internal fluid density and riser diameter contribute to damping the structural response, resulting in reduced dynamic amplification and more stable vibration patterns. The results reveal that configuring the riser with ten buoyancy modules uniformly spaced at 15 m intervals results in an approximate attenuation of 10 % in CF and 20 % in IL peak vibration amplitudes, under operating conditions at a water depth of 1000 m.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104650"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial distribution of regular wave overtopping on landscape revetment during typhoon landfalls","authors":"Huiqi Chen ,&nbsp;Hongjie Wen ,&nbsp;Shuai Wang ,&nbsp;Xiangpeng Qiu ,&nbsp;Guangming Liu ,&nbsp;Yu Chen","doi":"10.1016/j.apor.2025.104675","DOIUrl":"10.1016/j.apor.2025.104675","url":null,"abstract":"<div><div>Typhoons raise nearshore water levels and generate large waves, posing significant wave overtopping risks to low-crested revetments designed with hydrophilic considerations. Severe wave overtopping can threaten infrastructure, including buildings and roads located behind revetments. This study systematically investigates the effects of wind speed, breast wall height, revetment slope, and incident wave period on the spatial distribution of regular wave overtopping and the associated slamming forces on roadways during typhoon landfalls. A non-reflective numerical wave flume integrated with wind fields is developed for the analysis. The results reveal that wind speed significantly affects wave overtopping discharge and its spatial distribution behind revetments. During typhoon landfalls, the overtopping discharge for a single wave can increase by up to 5.2 times compared to calm conditions. The influence distance and maximum slamming force on roadways can increase by up to 1.7 times and 5.9 times, respectively. Additionally, the breast wall height, revetment slope, and incident wave period significantly influence the spatial distribution of wave overtopping water and slamming forces. These findings offer critical technical guidance for designing infrastructure layouts behind revetments.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104675"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A two-way coupled wave–current high resolution hindcast for the South China Sea","authors":"Tiziano Bagnasco ,&nbsp;Alessandro Stocchino ,&nbsp;Michalis I. Vousdoukas ,&nbsp;Jinghua Wang","doi":"10.1016/j.apor.2025.104672","DOIUrl":"10.1016/j.apor.2025.104672","url":null,"abstract":"<div><div>In the present study, we performed a 53-year wave hindcast (1970–2022) for a significant portion of the South China Sea (SCS) with an unstructured mesh that reaches a resolution of 0.008 ° along the coasts of the Guangdong province (China). The adopted modeling approach is based on the fully two-way coupled SCHISM-WWMIII numerical suite. The model was forced with ERA5 wind velocities that were compared to IFREMER altimeter wind velocities and then bias corrected for a more accurate treatment of the wind component. Eight major tidal harmonics extracted from FES2014 were imposed at the open boundaries. After a preliminary mesh independence analysis, the model results have been validated against satellite altimeter observations retrieved from the European Space Agency database spanning the period from 1992 to 2019. Moreover, 28 year in-situ measurements from two coastal wave buoys and data from four tidal gauge stations (approximately 20 years) were used to test the nearshore skills of the model. Several statistical indicators have been used to evaluate the offshore and nearshore performance of the model results in terms of the main wave parameters (significant wave height, peak wave period, mean wave direction) and water levels. All statistical metrics suggest that the present hindcast improved the predictions of waves and water levels compared to previous datasets, especially in the coastal regions. The high spatial resolution together with a full coupling allowed the model to capture and simulate processes that are induced by the non-linear interactions between waves and currents, especially nearshore.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104672"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of an aero-elastic-servo-hydro-mooring coupling framework for FOWT system","authors":"Yangyang Gao ,&nbsp;Yanning Chen ,&nbsp;Lizhong Wang","doi":"10.1016/j.apor.2025.104676","DOIUrl":"10.1016/j.apor.2025.104676","url":null,"abstract":"<div><div>A hybrid simulation approach for the integrated time domain simulation of floating offshore wind turbine (FOWT) is developed based on the open-source codes OpenFOAM and OpenFAST. A dynamic link library is proposed for the aero-servo-hydro-mooring coupling framework. The validation of the present integrated coupling framework is carried out for the OC4-DeepCWind 5MW FOWT. A series of numerical simulations are further performed to investigate the dynamic performance of the DeepCwind FOWT with different regular wave cases and combined wind-wave cases. The hydrodynamic and aerodynamic performance of the FOWT is further examined for different focused wave cases. The simulation results demonstrate that the dynamic responses of the FOWT obtained from the developed framework are consistent with those obtained from the literature. The coupled framework can significantly improve computational efficiency by accounting for wave-structure interactions compared to the full-scale CFD and CFD-ALM methods. The motion amplitudes of the FOWT will be significantly increased in focused wave cases.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104676"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depth dependent added mass computations using impulse motion simulations for shallowly submerged vehicles, Part 2: Accelerating from steady forward velocity","authors":"William Lambert,&nbsp;Stefano Brizzolara,&nbsp;Craig Woolsey","doi":"10.1016/j.apor.2025.104657","DOIUrl":"10.1016/j.apor.2025.104657","url":null,"abstract":"<div><div>Simulations of impulsive motion have previously been shown to accurately calculate depth dependent added mass at zero forward speed for underwater vehicles that are shallowly submerged. The simulation procedure, using high-fidelity CFD, produces added mass values at the infinite frequency limit while minimizing modeling assumptions that are present in lower-fidelity methods. The use of impulse-like simulations during parameter calculation results in shorter simulation times while simultaneously allowing for frequency independent parameters to be identified separately from memory effects. The present study extends the application of impulsive motion computations to cases that involve vehicle motions from an initial steady forward speed. Although they are independent of acceleration, calculated added mass values are shown to depend on both steady forward velocity and depth of submergence. Changes in the free surface elevation due to the creation of a Kelvin wave pattern alter the local submergence depth of the vehicle thereby affecting the added mass. The inclusion of viscosity and the presence of a viscous boundary layer is captured using steady-state simulations but is shown to have little influence on the added mass during a transient impulse-like maneuver. This viscosity independence is explained by the relatively small change in velocity from the nominal steady forward velocity and the focus on inertial effects by using small time scale simulations.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104657"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on structure damage equivalence of hull girders with different scales subjected to near-field underwater explosion","authors":"Jinzhu Zhai ,&nbsp;Xiangshao Kong ,&nbsp;Hu Zhou ,&nbsp;Cheng Zheng ,&nbsp;Zeyu Jin","doi":"10.1016/j.apor.2025.104681","DOIUrl":"10.1016/j.apor.2025.104681","url":null,"abstract":"<div><div>Over the years, numerous experiments and numerical simulations have been performed to investigate the damage of marine structures subjected to near-field underwater explosions. These studies, therefore, hold immense significance as they provide identified damage pattern of structure. Despite this, it is essential to further explore the connection among various damage patterns of existing work to help predicting the damage of real structure by employing the test results of small-scale structures. To address this gap, this study proposed an equivalent design method for hull girder model based on scaled-down similarity criteria and reversed design idea, which is for investigating the equivalent damage of structures with different scale subjected to near-field underwater explosion. Different from the traditional scaling method, in which both the structure and blast load are scaled-down accordingly for small size test model, the present method concentrates on the damage equivalence between two structures with different size subjected to the same blast loading from underwater explosions. This equivalent design methodology ensures compliance with fundamental blast principles during the structural equivalence process of both overall and local damage. In order to verify the method presented in this paper, two hull girder models were designed and manufactured, and underwater explosion tests were implemented to investigate the degree of damage between models. A comparative analysis of the overall damage and local damage of the central cabin between different scale models reveals that the damage patterns exhibit a high degree of consistency under identical conditions, simultaneously the similarity ratio errors pertaining to the extent of structural damage are within a 15 % margin. The results show that the presented design method is capable of predicting the structural damage of large-scale hull girder structure under the same load condition based on the results of small-scale model tests.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104681"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of sand ripples on the wave-induced seabed instability of the surface seabed","authors":"Titi Sui ,&nbsp;Zhendi Yang ,&nbsp;Song Gao ,&nbsp;Favour Boadi Narh ,&nbsp;Yunhan Yang ,&nbsp;Musheng Yang","doi":"10.1016/j.apor.2025.104655","DOIUrl":"10.1016/j.apor.2025.104655","url":null,"abstract":"<div><div>Wave-induced seabed instability significantly impacts the hydrodynamics of flow-particle interaction near the seabed surface. Previous studies on seabed instability mostly assume a flat seabed, neglecting the influence of sand ripple morphology on wave-induced soil dynamics. In the present study, the effects of sand ripples on the wave-induced seabed instability of the surface seabed are investigated. The numerical model is first validated by comparing the present simulations with results from prior experimental studies and empirical equations. Through model application, the present study investigated how sand ripples affect seabed instability, explicitly focusing on pore pressure, incipient motion of particles, and liquefaction depth. The present findings indicate the following: (1) variables related to seabed instability (pore pressure, Shields parameter, liquefaction depth) undergo spatial fluctuations in a sinusoidal pattern beneath the rippled surface, (2) the minor sand ripples may have significant effects on the incipient motions of sand particles, for instance, the very low coefficient of variation <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>=</mo><mn>1</mn><mo>.</mo><mn>2</mn><mtext>%</mtext></mrow></math></span> in sand ripple profile can induce as much as <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>=</mo><mn>23</mn><mtext>%</mtext></mrow></math></span> in the modified Shields parameter, and (3) these effects are most pronounced at the troughs of sand waves, especially for a relatively low Shields parameter and small seabed depth.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"161 ","pages":"Article 104655"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}