RANSE Simulation of Ship Seakeeping using Overlapping Grids

Klemt, Matthias; Hamburg-Harburg, TU

doi:10.1179/str.2005.52.2.003

Cited by 9 publications

(9 citation statements)

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In such a flow case, the interface-capturing methods are advantageous, because they enable modelling the effect of arbitrary freesurface behaviour.…”

Section: Introductionmentioning

confidence: 99%

On the numerical accuracy of the wave load distribution on a ship advancing in short and steep waves

2011

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Defining numerical uncertainty is an important part of the practical application of a numerical method. In the case of a ship advancing in short and steep waves, little knowledge exists on the solution behaviour as a function of discretisation resolution. This paper studies an interfacecapturing (VOF) solution for a passenger ship advancing in steep (kA = 0.24) and short waves (L w /L pp = 0.16). The focus is to estimate quantitative uncertainties for the longitudinal distributions of the first-third harmonic wave loads in the ship bow area. These estimates are derived from the results of three systematically refined discretisation resolutions. The obtained uncertainty distributions reveal that even the uncertainty of the first harmonic wave load varies significantly along the ship bow area. It is shown that the largest local uncertainties of the first harmonic wave load relate to the differences in the local details of the propagating and deforming encountered waves along the hull. This paper also discusses the challenges that were encountered in the quantification of the uncertainties for this complex flow case.

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Section: Introductionmentioning

confidence: 99%

On the numerical accuracy of the wave load distribution on a ship advancing in short and steep waves

2011

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“…In the case of predicting ship wave loads with interface-capturing methods, several previous studies have contributed to this task, e.g. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Even if such studies already exist, it is difficult to reach general conclusions on the validity of these methods.…”

Section: Introductionmentioning

confidence: 99%

“…[1-3, 5, 6, 8-14, 16], but the examples of studies on local loads like pressure histories are fewer in number, e.g. [4,7,12,15].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of ship wave loads, reaching the asymptotic range is a challenge even for the lowest harmonic components, although quantified uncertainties have been presented for mean and first harmonic global loads in [5,6,14,16] and for the 1st-3rd harmonic components of the vertical force acting on a ship frame in [17]. The qualitative solution behaviour of ship wave loads has been studied in [2,4,10]. As for studying the solution behaviour of local pressure histories, the qualitative approach has been applied in [4].…”

Section: Introductionmentioning

confidence: 99%

“…The qualitative solution behaviour of ship wave loads has been studied in [2,4,10]. As for studying the solution behaviour of local pressure histories, the qualitative approach has been applied in [4].…”

Section: Introductionmentioning

confidence: 99%

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Computational and experimental study on local ship loads in short and steep waves

2013

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Currently, little information exists on the validity of interface-capturing methods in predicting local ship wave loads in short and steep waves. This study compares computational and experimental results in such a case (kA = 0.24, L wave /L ship = 0.16). The results allow the variation of wave loading between ten locations in the bow area of the ship to be observed. The computations were performed with an unstructured RANS solver that models free-surface flows with a volume-of-fluid method. In the model tests, the wave loads were measured with pressure sensors. The analysis of the results focuses on the wave conditions and on the pressure histories of the local wave loads. The computational and experimental results are in good qualitative agreement and encourage the further use of the computational results.

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Coupled ghost fluid/two‐phase level set method for curvilinear body‐fitted grids

Huang¹,

Carrica²,

Stern³

2007

Numerical Methods in Fluids

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SUMMARYA coupled ghost fluid/two-phase level set method to simulate air/water turbulent flow for complex geometries using curvilinear body-fitted grids is presented. The proposed method is intended to treat ship hydrodynamics problems. The original level set method for moving interface flows was based on Heaviside functions to smooth all fluid properties across the interface. We call this the Heaviside function method (HFM). The HFM requires fine grids across the interface. The ghost fluid method (GFM) has been designed to explicitly enforce the interfacial jump conditions, but the implementation of the jump conditions in curvilinear grids is intricate. To overcome these difficulties a coupled GFM/HFM method was developed in which approximate jump conditions are derived for piezometric pressure and velocity and pressure gradients based on exact continuous velocity and stress and jump in momentum conditions with the jump in density maintained but continuity of the molecular and turbulent viscosities imposed. The implementation of the ghost points is such that no duplication of memory storage is necessary. The level set method is adopted to locate the air/water interface, and a fast marching method was implemented in curvilinear grids to reinitialize the level set function. Validations are performed for three tests: super-and sub-critical flow without wave breaking and an impulsive plunging wave breaking over 2D submerged bumps, and the flow around surface combatant model DTMB 5512. Comparisons are made against experimental data, HFM and single-phase level set computations. The proposed method performed very well and shows great potential to treat complicated turbulent flows related to ship flows.

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RANSE Simulation of Ship Seakeeping using Overlapping Grids

Cited by 9 publications

References 0 publications

On the numerical accuracy of the wave load distribution on a ship advancing in short and steep waves

On the numerical accuracy of the wave load distribution on a ship advancing in short and steep waves

Computational and experimental study on local ship loads in short and steep waves

Coupled ghost fluid/two‐phase level set method for curvilinear body‐fitted grids

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