... ABSTRACT Under subcritical Reynolds number conditions of Re=4.1×10 5 , a numerical simulation was conducted based on the Realizable k-ε model for five groups of rotor sails rotating at a constant speed with different surface roughnesses under uniform wind speed. The study focused...

... interpolation discretized propeller reservoir simulation ship deviation roughness ship resistance polar engineering conference coefficient accuracy Proceedings of the Thirty-fourth (2024) International Ocean and Polar Engineering Conference Rhodes, Greece, June 16 21, 2024 Copyright © 2024...

... influencing the fatigue strength are the roughness of the (thermal) cut edge, strength of base material as well as the hardness and residual stresses from cutting techniques. This study reports fatigue test results of structural steels (S235JR, S355J2+N, S690QL) with (thermal) cut edges, including material...

... upstream oil & gas friction coefficient subsea clamp specimen test facility sub-sea system normal force wet test coefficient load cell dry test steel surface condition surface roughness test result controls and umbilicals roughness pom-c test material contact material...

... the relationship between the roughness and Reynolds number of different pipes. At present, the researches on marine HDPE pipelines mostly focus on the steady state theoretical analysis, and there is few researches on the steady and transient numerical analysis of marine HDPE pipelines. asia government...

...Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference Shanghai, China, June 5 10, 2022 Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE) ISBN 978-1-880653-81-4; ISSN 1098-6189 www.isope.org Assessment of the roughness effect...

... Mangkhu in 2018. Then, we analyze the interaction between pluvial flooding and fluvial flooding in urban region during the typhoon, and the effect of the spatial heterogeneity of the roughness arising from different land uses in the city. The main conclusions can provide useful guidelines and insights...

... of the contact length of the steel tube-core concrete interface and the surface roughness of the steel tube on the ultimate bond strength. Roeder et al. (1999) summarized the previous research results and carried out the push-out test of 20 specimens. In the study, the influence of concrete shrinkage...

... roughness increases with prolonged service wear and marine growth. The current work looks to consider surface roughness effects using 3-d CFD simulations. The new design still shows low drag and effective VIV suppression performance up to a higher level of surface roughness, which makes it suitable for long...

... of a full scale product carrier, the sensitivity of turbulence model and grid was investigated, and the effect of the surface roughness was also studied at model and full scale. As turbulent model, k-ε realizable, k-ε standard, K-ω SST and Reynolds Stress model were applied with 1st and 2nd order temporal...

... bubbles or wind tearing breaking wave crests. The drag coefficients and sea surface aerodynamic roughnesses reach their maximum values vary under different wave developments. KEY WORDS: sea spray; wave age; drag coefficient; high wind speed INTRODUCTION The primary driving force for wind waves is sea...

... ABSTRACT Effects of surface roughness and fouling on ship resistance are analyzed by numerical simulation, the fouling covered on hull are graded through the visual inspection, three different hull surface conditions are divided corresponding to three models used to simulate by FLUENT software...

... aspect ratio and surface roughness on resistance factor are explored extensively. A new interpretation formula of the T-bar resistance factor is proposed as a function of the T-bar aspect ratio and roughness. INTRODUCTION The recent exploration of hydrocarbon fields in deep water has placed more...

... of the irregularity and the roughness at the surface of screen constituting well material on the friction strength at contact surface between screen and gravel pack were considered from the results of push-out test. In addition, on the basis of the experimental evaluation for the friction strength, numerical...

... ABSTRACT The main purpose of this study is to investigate the characteristics of wave force reduction by the coastal dike and the bottom roughness through hydraulic model experiments applying Froude similarity's law with the scale of 1 to 100. It was clarified that tsunami wave force...

... as the important aspect of correctly specifying bed material availability (Mead, 1999). trench migration rate ripple height bed roughness trench infill sediment migration rate trench infill numerical model test 6 dimension artificial intelligence grain roughness flow facility test 5 test 2...

... development wave energy converter vertical wall piezoelectric material sustainability electric power tanaka external force mutsuda roughness ocean energy reef electric performance :DYH (QHUJRQYHUWHU 8VLQJ D &RPSUHVVHG 7\SH RI )OH[LEOH 3LH]RHOHFWULF 'HYLFH Hidemi MXWVXGD, Motoki OWDNH, Kenichi...

... Reynolds number) conditions, while full-scale SCRs will experience critical and even super-critical conditions. In addition, the riser surface roughness is found to be an important parameter for VIV, but has so far not been explicitly taken into account in engineering analyses. A large amount...

... values in accordance with Froude scaling law. The test results suggest that the cylinder fitted with sacrificial anodes and the one wrapped with rough surface have shown an overall increase in drag and inertia coefficients. hydrodynamic force sacrificial anode chakrabarti upstream oil & gas...

... line upstream oil & gas wear rate topography fatigue failure tiffener luciano valdomiro ew ailure riterion polyurethane asperity metallic insert subsea system polymeric part stiffener surface roughness roughness asperity angle Proposed ew ailure riterion for ending tiffeners...