Accurate prediction of complex free surface flow around a high speed craft using a single-phase level set method

Broglia, Riccardo; Durante, Danilo

doi:10.1007/s00466-017-1505-1

Cited by 37 publications

(34 citation statements)

References 42 publications

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“…The validation campaign first involves comparison of global quantities with experimental data usually coming from towing tank tests. The most important global quantities which are analyzed when dealing with 2 DoF setups are typically the total drag, the pitch angle, and the sinkage [14]. Besides, more detailed physics elements -e.g., wave patterns, pressure distributions, wetted surface -are taken into consideration to assess the quality of the solutions.…”

Section: Validation Of Resultsmentioning

confidence: 99%

“…As concerns the trim angle, the differences are still small but a bit higher. It is well known that a perfect reproduction of trim angles is challenging [14] and, in our case, the differences can be related to the direction of the towing force which creates an additional pitching moment not considered in the current LincoSim setup.…”

Section: Validation Of Resultsmentioning

confidence: 99%

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LincoSim: a Web Based HPC-Cloud Platform for Automatic Virtual Towing Tank Analysis

Salvadore

Ponzini

2019

J Grid Computing

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Thanks to evolving web technologies, computational platforms, automation tools and opensource software business model, today, it is possible to develop powerful automatic and virtualized web services for complex physical problems in engineering and design. In particular, in this work, we are presenting a new web based HPC-cloud platform for automatic virtual towing tank analysis. It is well known that the design project of a new hull requires a continuous integration of shape hypothesis and hydrodynamics verifications using analytical tools, 3D computational methods, experimental facilities and sea keeping trial tests. The complexity and the cost of such design tools increase considerably moving from analytical tools to sea keeping trials. In order to perform a meaningful trade-off between costs and high quality data acquiring, during the last decade the usage of 3D computational models has grown pushed also by well-known technological factors. Nevertheless, in the past, there were several limiting factors on the wide diffusion of 3D computational models to perform

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Section: Validation Of Resultsmentioning

confidence: 99%

Section: Validation Of Resultsmentioning

confidence: 99%

LincoSim: a Web Based HPC-Cloud Platform for Automatic Virtual Towing Tank Analysis

Salvadore

Ponzini

2019

J Grid Computing

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“…The hydrodynamic resistance was evaluated by an adaptive multi-fidelity SRBF metamodel [52] trained with high-fidelity URANS (χnavis [53]) and low-fidelity potential flow (WARP [54]) solvers. Further details on design variables, objective functions, constraints, and conditions can be found in [51].…”

Section: Swath Problemmentioning

confidence: 99%

Hybridization of Multi-Objective Deterministic Particle Swarm with Derivative-Free Local Searches

et al. 2020

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The paper presents a multi-objective derivative-free and deterministic global/local hybrid algorithm for the efficient and effective solution of simulation-based design optimization (SBDO) problems. The objective is to show how the hybridization of two multi-objective derivative-free global and local algorithms achieves better performance than the separate use of the two algorithms in solving specific SBDO problems for hull-form design. The proposed method belongs to the class of memetic algorithms, where the global exploration capability of multi-objective deterministic particle swarm optimization is enriched by exploiting the local search accuracy of a derivative-free multi-objective line-search method. To the authors best knowledge, studies are still limited on memetic, multi-objective, deterministic, derivative-free, and evolutionary algorithms for an effective and efficient solution of SBDO for hull-form design. The proposed formulation manages global and local searches based on the hypervolume metric. The hybridization scheme uses two parameters to control the local search activation and the number of function calls used by the local algorithm. The most promising values of these parameters were identified using forty analytical tests representative of the SBDO problem of interest. The resulting hybrid algorithm was finally applied to two SBDO problems for hull-form design. For both analytical tests and SBDO problems, the hybrid method achieves better performance than its global and local counterparts.

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“…The main characteristics of the solver are reported here; for more details and some applications, the reader is referred to Refs. [28][29][30][31][32][33].…”

Section: Test Conditions and Submissionsmentioning

confidence: 99%

“…However, since the model has been also demonstrated to be rather dissipative, special attention must be posed in generating the computational mesh, especially where high velocity gradients are expected. The free surface effects are simulated through a fully nonlinear level-set (LS) single phase methodology [29,33]. The numerical mesh employed is based on "chimera" grid technique.…”

Section: Test Conditions and Submissionsmentioning

confidence: 99%

Assessment of Computational Fluid Dynamics Capabilities for the Prediction of Three-Dimensional Separated Flows: The DELFT 372 Catamaran in Static Drift Conditions

Broglia

Zaghi

Campana

et al. 2019

Journal of Fluids Engineering

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In this paper, capabilities of state-of-the-art computational fluid dynamics (CFD) tools in the prediction of the flow-field around a multihull catamaran advancing in straight ahead motion at nonzero drift angles are investigated. CFD estimations have been provided by three research institutes by using their in-house codes: CNR-INM using Xnavis, IIHR using CFDShip-Iowa, and CNRS/ECN using ISIS. These allowed an in-depth comparison between different methodologies, such as structured overlapping grids versus unstructured grid, different turbulence models and detached eddy simulations (DES) approaches, and level-set (LS) versus volume of fluid (VoF). The activities were pursued within the NATO AVT-183 group “reliable prediction of separated flow onset and progression for air and sea vehicles,” aimed at the assessment of CFD predictions of large three-dimensional separated flows. Comparison between estimations is provided for both integral and local quantities, and for wave-induced vortices. Validation is reported by comparison against the available experimental fluid dynamics (EFD) data. Generally, all the simulations are able to capture the main features of the flow field; grid resolution effects are dominant in the onset phase of coherent structures and turbulence model affects the dynamic of the vortices. Hydrodynamic loads are in agreement between the submissions with standard deviation of about 3.5% for the resistance prediction and about 7% for lateral force and yaw moment estimation. Wave-induced vortices are correctly captured by both LS and VoF approaches, even if some differences have been highlighted, LS showing well-defined and long life vortices.

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Accurate prediction of complex free surface flow around a high speed craft using a single-phase level set method

Cited by 37 publications

References 42 publications

LincoSim: a Web Based HPC-Cloud Platform for Automatic Virtual Towing Tank Analysis

LincoSim: a Web Based HPC-Cloud Platform for Automatic Virtual Towing Tank Analysis

Hybridization of Multi-Objective Deterministic Particle Swarm with Derivative-Free Local Searches

Assessment of Computational Fluid Dynamics Capabilities for the Prediction of Three-Dimensional Separated Flows: The DELFT 372 Catamaran in Static Drift Conditions

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