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| 1 | Recent progress in CFD for naval architecture and ocean engineering显示文摘An overview is provided of CFDShip-Iowa modeling, numerical methods and high performance computing(HPC), including both current V4.5 and V5.5 and next generation V6. Examples for naval architecture highlight capability and needs. High fidelity V6 simulations for ocean engineering and fundamental physics describe increased resolution for analysis of physics of fluids. Uncertainty quantification research is overviewed as the first step towards development stochastic optimization. | STERN Frederick WANG Zhaoyuan YANG Jianming SADAT-HOSSEINI Hamid MOUSAVIRAAD Maysam BHUSHAN Shanti DIEZ Matteo YOON Sung-Hwan WU Ping-Chen YEON Seong Mo DOGAN Timur KIM Dong-Hwan VOLPI Silvia CONGER Michael MICHAEL Thad XING Tao THODAL Robert S. GRENESTEDT Joachim L. | 2015 | Journal of Hydrodynamics2015，27，1： | 12 |
| 2 | A one-dimensional polynomial chaos method in CFD–Based uncertainty quantification for ship hydrodynamic performance显示文摘A one-dimensional non-intrusive Polynomial Chaos(PC)method is applied in Uncertainty Quantification(UQ)studies for CFD–based ship performances simulations.The uncertainty properties of Expected Value(EV)and Standard Deviation(SD)are evaluated by solving the PC coefficients from a linear system of algebraic equations.The one-dimensional PC with the Legendre polynomials is applied to:(1)stochastic input domain and(2)Cumulative Distribution Function(CDF)image domain,allowing for more flexibility.The PC method is validated with the Monte-Carlo benchmark results in several high-fidelity,CFD-based,ship UQ problems,evaluating the geometrical,operational and environmental uncertainties for the Delft Catamaran 372.Convergence is studied versus PC order P for both EV and SD,showing that high order PC is not necessary for present applications.Comparison is carried out for PC with/without the least square minimization when solving the PC coefficients.The least square minimization,using larger number of CFD samples,is recommended for current test cases.The study shows the potentials of PC method in Robust Design Optimization(RDO)and Reliability-Based Design Optimization(RBDO)of ship hydrodynamic performances. | 贺伟 DIEZ Matteo CAMPANA Emilio Fortunato STERN Frederick 邹早建 | 2013 | Journal of Hydrodynamics2013，25，5： | 5 |
| 3 | A sharp interface approach for cavitation modeling using volume-of-fluid and ghost-fluid methods显示文摘This paper describes a novel sharp interface approach for modeling the cavitation phenomena in incompressible viscous flows. A one-field formulation is adopted for the vapor-liquid two-phase flow and the interface is tracked using a volume of fluid(VOF) method. Phase change at the interface is modeled using a simplification of the Rayleigh-Plesset equation. Interface jump conditions in velocity and pressure field are treated using a level set based ghost fluid method. The level set function is constructed from the volume fraction function. A marching cubes method is used to compute the interface area at the interface grid cells. A parallel fast marching method is employed to propagate interface information into the field. A description of the equations and numerical methods is presented. Results for a cavitating hydrofoil are compared with experimental data. | Thad Michael Jianming Yang Frederick Stern | 2017 | Journal of Hydrodynamics2017，29，6： | 3 |
| 4 | Experimental investigation of a fast catamaran in head waves显示文摘 | Benjamin Bouscasse Riccardo Broglia Frederick Stern | 2013 | Ocean Engineering2013，721，： | 1 |
| 5 | A simple and efficient direct forcing immersed boundary framework for fluid–structure interactions显示文摘 | Jianming Yang Frederick Stern | 2012 | Journal of Computational Physics2012，，15： | 1 |
| 6 | RANS computational fluid dynamics predictions of pitch and heave ship motions in head seas显示文摘 | Gabriel David Weymouth Robert Vance Wilson Frederick Stern | 2005 | Journal of Ship Research2005，49，2： | 1 |
| 7 | An improved particle correction procedure for the particle level set method显示文摘 | Zhaoyuan Wang Jianming Yang Frederick Stern | 2009 | Journal of Computational Physics2009，，16： | 1 |
| 8 | Benchmarking of computational fluid dynamics for ship flows: the gothenburg 2000 workshop显示文摘 | LARS LARSSON FREDERICK STERN and VOLKER BERTRAM | 2003 | Journal of Ship Research2003，47，1： | 1 |
| 9 | URANS simulations for a free-running container ship:Part 1. Turning-circle显示文摘The incompressible unsteady Reynolds-averaged Navier-Stokes(URANS)simulations are performed for a free-running container ship in maneuvering conditions:the starboard and portside turning circle simulations with 35°rudder deflection.The validation variables include trajectory,motions,and propeller performances,and the prediction shows acceptable agreements against the experimental data.During the steady-state part of the turning,the inertial forces balancing the local forces are reported to quantitatively assess the centrifugal force which appears from the force equilibrium between the rudder,propeller,and the bare-hull.The study on the local flow focuses on finding the correlations between the propeller inflow and the propeller performance to investigate the differences in propeller performances during the portside and starboard turning.The preliminary simulations,performed with the grid triplet,comprise propeller open-water,resistance,and self-propulsion simulations,from which the validation studies and the studies for the local force and the local flow are fulfilled and applied for the main simulations.Both propeller and rudder are fully discretized and controlled,mimicking the experiment.Level-set,overset approach and Mentor’s SST model are employed for the free-surface capturing,large motion prediction,and turbulence closure. | Dong-Hwan Kim Yugo Sanada Sungtek Park Hamid Sadat-Hosseini Frederick Stern | 2021 | Journal of Hydrodynamics2021，33，3： | 0 |
| 10 | URANS simulations for a free-running container ship:Part 2. Added power显示文摘Part 2 reports the validation,local force and local flow study results for the free-running added power simulations whose conditions are the same as the self-propulsion test except for the increased propeller rotational speed and the presence of wave.When targeting the same mean Froude number in the wave condition,the propeller requires the increased propeller rotational speed for the operation at the low advance ratio due to the added resistance.The test is performed at five different wavelengths in head waves and four different headings in the oblique waves.For the validation study,the time series of the validation variables is decomposed with discrete Fourier transform to extract the harmonic values.Validation variables are global parameters,including motions,propeller thrust,and torque coefficients,added power variables,and self-propulsion factors which show reasonable agreement against the experiment results and produces a similar error from the self-propulsion simulation.The local force study shows that the added resistance mostly appears at the bow due to the bow plunging during the short head wave and resonance condition.The contributions of the gravitational force and the buoyant force are found to increase as the stern motion exceeds the bow motion during the long head wave condition.The oscillation of the propeller performances shows correlation with the first harmonic amplitude of the propeller inflow.Heave,pitch,and roll decay tests are performed prior to the main test to assess the natural frequencies of the ship.Same as Part 1,a discretized propeller is used. | Dong-Hwan Kim Yugo Sanada Hamid Sadat-Hosseini Frederick Stern | 2021 | Journal of Hydrodynamics2021，33，3： | 0 |
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