Volume 6: Ocean Engineering最新文献_第7页

Reconstructing Sea-States in the Southern Ocean Using Ship Motion Data 利用船舶运动数据重建南大洋海况

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-62757

Filippo Nelli, A. Van Zuydam, K. Pferdekamper, A. Alberello, Marzieh H. Derkani, A. Bekker, A. Toffoli

引用次数: 1

Modeling Relation Between Forward Speed and Propeller Speed of the Cruising AUV Using Multiple Regression Analysis 基于多元回归分析的巡航AUV前向航速与螺旋桨航速关系建模

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-62350

Jun Umeda, T. Fujiwara

{"title":"Modeling Relation Between Forward Speed and Propeller Speed of the Cruising AUV Using Multiple Regression Analysis","authors":"Jun Umeda, T. Fujiwara","doi":"10.1115/omae2021-62350","DOIUrl":"https://doi.org/10.1115/omae2021-62350","url":null,"abstract":"\u0000 This study addresses predicting the relationship between forward speed and propeller speed of an autonomous underwater vehicle (AUV) with a towed flexible cable using multiple regression analysis. Accurate prediction of the propeller speed corresponding to forward speed is important. The prediction requires considering various factors such as the dynamic behavior of a flexible cable, tidal currents, and AUV motions. The regression analysis based on in-service data of the AUV, therefore, established the relation between the forward speed and propeller speed considering the other factors. On the other hand, minimal independent variables in the regression model are desirable to avoid multicollinearity and overfitting. Variable selection based on the t-Test and sparse modeling was carried out to remove insignificant variables. We confirmed that the regression model presented in this study was in agreement with the observed data sufficiently, and the residuals of the regression model followed a normal distribution. The propeller speed predicted by the regression model considering only the forward speed of the AUV was comparable to the result predicted by the CFD calculation, not including the other factors. The result indicates the regression analysis can validate the results based on experiments and a numerical simulation.","PeriodicalId":23784,"journal":{"name":"Volume 6: Ocean Engineering","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78428622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Load Coefficients and Dimensions of Raschel Knitted Netting Materials in Fish Farms 渔场拉舍尔编织网材料的载荷系数和尺寸

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-63401

Heidi Moe Føre, P. Endresen, Hans V. Bjelland

引用次数: 2

Clustering Applied to Large Sets of Environmental Conditions for Selecting Typical Scenarios for Ship Maneuvering Real-Time Simulations 聚类技术在船舶操纵实时仿真典型场景选择中的应用

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-62875

F. M. Moreno, E. Tannuri

引用次数: 0

Hydrodynamic Impact on Wedges During Water Entry 楔块入水过程中的水动力影响

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-62921

Daniel de Oliveira Costa, Joel Sena Sales Junior, A. C. Fernandes, Rodrigo dos Santos Corrêa

{"title":"Hydrodynamic Impact on Wedges During Water Entry","authors":"Daniel de Oliveira Costa, Joel Sena Sales Junior, A. C. Fernandes, Rodrigo dos Santos Corrêa","doi":"10.1115/omae2021-62921","DOIUrl":"https://doi.org/10.1115/omae2021-62921","url":null,"abstract":"\u0000 The problem of water entry of wedges represents one of the most classic research topics in fluid mechanics. Along the past decades, many different analytical methods have been proposed to calculate pressure distribution and peak loads during the water entry, such as Wagner (1932) and Dobrovol’skaya (1969). Zhao and Faltinsen (1993) and Mei (1995) present numerical solutions based on potential theory assumptions (inviscid, irrotational and incompressible flow). For more complex geometries and cases these methods might not be accurate enough due to the simplifications assumed, and in these cases the use of computational fluid dynamics (CFD) might be an interest tool to provide more accurate analysis.\u0000 This work presents CFD results for different conditions of water entry of 2D wedges. The simulations were performed with a marine dedicated flow solver, FINE™/Marine from NUMECA, which features an unsteady Reynolds-averaged Navier-Stokes (URANS) solver and a finite volume method to perform spatial discretization. The multiphase flow is represented through the Volume of Fluid (VOF) method for incompressible and nonmiscible fluids. Different water entry conditions are explored. The effect of the mesh size, time step and other setup parameters over the results are discussed for simulations with 2D wedges to extend to other studies of water impact. The wedge velocity and hydrodynamic pressure distribution along the model’s face are monitored during the water entry and compared to experimental data from previous publication (Yettou et al, 2006) for water entry of wedges during free fall.","PeriodicalId":23784,"journal":{"name":"Volume 6: Ocean Engineering","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75342838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Simulation of 5th-Order Stokes Wave in Finite Water Depth Based on Momentum Source Method 基于动量源法的有限水深5阶Stokes波数值模拟

Volume 6: Ocean Engineering Pub Date : 2021-06-21 DOI: 10.1115/omae2021-62487

Wenjie Wang, Zhi-liang Gao

{"title":"Numerical Simulation of 5th-Order Stokes Wave in Finite Water Depth Based on Momentum Source Method","authors":"Wenjie Wang, Zhi-liang Gao","doi":"10.1115/omae2021-62487","DOIUrl":"https://doi.org/10.1115/omae2021-62487","url":null,"abstract":"\u0000 For numerical simulation of structure-wave interaction, the wave generation with high accuracy is prime to analyze the wave loads and motions of the structure. Based on the fifth-order Stokes theory, a two-dimensional viscous wave flume, which was modeled using the commercial CFD solver ANSYS-FLUENT, was applied to the generation and propagation of regular waves in finite water depth. With the user-defined function provided by the solver, the momentum source term and boundary condition, which are used for the wave generation and dissipation, were developed to ensure the accuracy of wave simulation with large steepness. In addition, the wave flume was separated into two regions, which are governed by the laminar model and turbulent model, respectively. The separation of laminar and turbulent regions can alleviate the side effect of turbulence on the accuracy of wave generation. In order to validate the present method, the regular wave propagating with different steepness in finite water depth were simulated. The numerical results were in good agreement with the theoretical ones. The study showed that the present method was effective for the simulation of Stokes wave in finite water depth, especially effective to improve the numerical accuracy in case of large wave steepness.","PeriodicalId":23784,"journal":{"name":"Volume 6: Ocean Engineering","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89476703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Variational Wave Acquisition Stereo System for the 3-D Reconstruction of Oceanic Sea States 一种用于海洋海况三维重建的变分波采集立体系统

Volume 6: Ocean Engineering Pub Date : 2011-01-01 DOI: 10.1115/OMAE2011-49061

Guillermo Gallego, A. Yezzi, F. Fedele, A. Benetazzo

引用次数: 4