Large-scale DES computations of the forward speed diffraction and pitch and heave problems for a surface combatant

Carrica, Pablo M.; Huang, Jiafen; Noack, Ralph W.; Kaushik, D.; Barry, Smith; Stern, Frederick

doi:10.1016/j.compfluid.2010.02.002

Cited by 63 publications

(34 citation statements)

References 22 publications

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“…Dynamic overset grids are used to solve grid deformations and relative motions [30], with the interpolation coefficients between the grids recomputed dynamically at run time with the code Suggar [31]. Large-scale computations are achieved using high performance computing (HPC) with an MPI-based domain decomposition approach [32]. For complete details the reader is referred to the references [28e30,32] and literature therein.…”

Section: Flow Solvermentioning

confidence: 99%

Coupled multi-body dynamics and CFD for wind turbine simulation including explicit wind turbulence

et al. 2015

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a b s t r a c tA high fidelity approach for wind turbine aero-elastic simulations including explicit representation of the atmospheric wind turbulence is presented. The approach uses a dynamic overset computational fluid dynamics (CFD) code for the aerodynamics coupled with a multi-body dynamics (MBD) code for the motion responses to the aerodynamic loads. Mann's wind turbulence model was implemented into the CFD code as boundary and initial conditions. The wind turbulence model was validated by comparing the theoretical one-point spectrum for the three components of the velocity fluctuations, and by comparing the expected statistics from the CFD simulated wind turbulent field with the explicit wind turbulence inlet boundary from Mann model. Extensive simulations based on the proposed coupled approach were conducted with the conceptual NREL 5-MW offshore wind turbine in an increasing level of complexity, analyzing the turbine behavior as elasticity, wind shear and atmospheric wind turbulence are added to the simulations. Results are compared with the publicly available simulations results from OC3 participants, showing good agreement for the aerodynamic loads and blade tip deflections in time and frequency domains. Wind turbulence/turbine interaction was examined for the wake flow. It was found that explicit turbulence addition results in considerably increased wake diffusion. The coupled CFD/MBD approach can be extended to include multibody models of the shaft, bearings, gearbox and generator, resulting in a promising tool for wind turbine design under complex operational environments.

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Section: Flow Solvermentioning

confidence: 99%

Coupled multi-body dynamics and CFD for wind turbine simulation including explicit wind turbulence

et al. 2015

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“…1 Coupling of flow, overset, and propeller solvers. Overset connectivity solver is shown as single-lagged, explicit; other configurations are described in Carrica et al (2010) allowed to vary in all spatial directions, but is frozen in time. A drag coefficient is used to model viscous forces on the blades.…”

Section: Propeller Modelingmentioning

confidence: 99%

“…The current architecture of the coupled code also runs Suggar in multiple lagged mode, as described in detail in Carrica et al (2010). This is shown in Fig.…”

Section: Coupling Of Flow and Propeller Solversmentioning

confidence: 99%

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Submarine Maneuvers Using Direct Overset Simulation of Appendages and Propeller and Coupled CFD/Potential Flow Propeller Solver

Martín¹,

Michael²,

Carrica³

2015

Journal of Ship Research

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This article presents two approaches to simulate maneuvers of a model radio-controlled submarine. In the direct simulation approach, rudders, stern planes, and propellers are gridded and treated as moving objects using dynamic overset technology. The second approach couples the overset computational fluid dynamics (CFD) solver and a potential flow propeller code, with both codes exchanging velocities at the propeller plane and wake, body forces, and propeller forces and moments, whereas rudders and stern planes are still explicitly resolved. It is shown that during the maneuvers, the range of advance coefficients does not deviate much from the design point, making a coupled approach a valid choice for standard maneuvering simulations. By allowing time steps about an order of magnitude larger than for the direct simulation approach, the coupled approach can run about five times faster. The drawback is a loss of resolution in the wake as the direct propeller simulation can resolve blade vortical structures. Open water propeller curves were simulated with both the direct propeller approach and the coupled approach, showing that the coupled approach can match the direct approach performance curves for a wide range of advance coefficients. Simulations of a horizontal overshoot maneuver at two approach speeds were performed, as well as vertical overshoot and controlled turn maneuvers at high speed. Results show that both CFD approaches can reproduce the experimental results for all parameters, with errors typically within 10%.

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“…This program was also validated by Guo et al (2012) for calculating the added resistance of KVLCC2 type hulls in head waves. Recently, Sadat-Hosseini et al (2013) presented the added resistance calculation of KVLCC2 by both experiment and numerical method using CFDShip-Iowa v4.5 (Carrica et al, 2010), which is an overset, block structured CFD solver with RANS and DES for turbulence modeling and a singlephase level-set method for free-surface capturing.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of added resistance on ships in short waves

et al. 2014

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Large-scale DES computations of the forward speed diffraction and pitch and heave problems for a surface combatant

Cited by 63 publications

References 22 publications

Coupled multi-body dynamics and CFD for wind turbine simulation including explicit wind turbulence

Coupled multi-body dynamics and CFD for wind turbine simulation including explicit wind turbulence

Submarine Maneuvers Using Direct Overset Simulation of Appendages and Propeller and Coupled CFD/Potential Flow Propeller Solver

Numerical analysis of added resistance on ships in short waves

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