A Numerical Application to Predict the Resistance and Wave Pattern of Kriso Container Ship

Özdemir, Yavuz Hakan; Cosgun, Taner; Doğrul, Ali; Barlas, Barış

doi:10.21278/brod67204

Cited by 20 publications

(12 citation statements)

References 21 publications

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“…The realizable, two layer k-ε model, hereafter referred to as "k-ε 2l" for brevity, has been extensively used for practical applications (Cakici et al, 2017;Liu et al, 2018;Ozdemir et al, 2016;Song et al, 2019;Terziev et al, 2018;Tezdogan et al, 2016aTezdogan et al, , 2016b, to name but a few), making it an ideal candidate for our purposes. However, there are a large number of variants of the k-ε model put forth by researchers, each claiming superiority.…”

Section: The K-ε Model and Its Variantsmentioning

confidence: 99%

Application of eddy-viscosity turbulence models to problems in ship hydrodynamics

Terziev

Tezdogan

Incecik

2019

Ships and Offshore Structures

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With the rapid advent of computational methods in all fields of engineering, several areas have emerged as significant sources of ambiguity. Among these is the selection of a turbulence model to close the Reynolds averaged Navier-Stokes equation. In ship hydrodynamics, this has been particularly difficult to resolve due to the complex nature of the problem. Furthermore, there are a wide variety of turbulence models all claiming superiority. Thus, navigating to the correct choice is a subject of experience. The present study aims to alleviate the ambiguity inherent in the field. This is done by performing a series of tests on the turbulence models and comparing the integral outcomes with experimental results. Specifically, shallow water cases are chosen due to the additional layer of complexity associated in the prediction of parameters of interest. The results are analysed via a modified bivariate plot, which reveals a strong candidate for the optimum choice of turbulence modelling. The assessment simultaneously takes into account resistance and sinkage, in addition to consistency across different casestudies. The time per iteration also points towards the same candidate, identified as the standard k-ω model, as a good choice within the software used to perform the analysis. The results also suggest that pressure resistance and its constituent components are not coupled with the turbulence model. On the other hand, frictional resistance is highly dependent on the closure selected and is identified as the main contributor to deviations with regards to experimental values. Abe et al. (1994) proposed a modification of the standard k-ε model, henceforth referred to as 'AKN'

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Section: The K-ε Model and Its Variantsmentioning

confidence: 99%

Application of eddy-viscosity turbulence models to problems in ship hydrodynamics

Terziev

Tezdogan

Incecik

2019

Ships and Offshore Structures

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“…To model the turbulence in the fluid, a − model with the all + treatment approach is adopted. With reference to the former, it can be asserted that it has been widely used in both academic and industrial applications [40]- [42]. To further reinforce the case for employing this two equation turbulent kinetic energy -dissipation model, the reader is referred to the wide range of research that has used the − model: full-scale wake prediction [43], roll decay tests [44], and ship squat predictions [45].…”

Section: Numerical Modellingmentioning

confidence: 99%

Influence of Mixed Flows on Ship Hydrodynamics in Dredged Channels

Terziev

Tezdogan

Incecik

2019

Volume 7A: Ocean Engineering

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Although there is a significant body of research devoted to the shallow water hydrodynamic aspects of ships, several unexamined topics remain. Among these is that of critical outer flow in a dredged channel and its influence on parameters of interest. While empirical methods can be used with ease to resolve this, they can provide results with reliability sufficient only for an early design stage. On the other hand, more sophisticated potential flow theories are either inapplicable or do not perform well at the critical limit. However, RANS (Reynolds Averaged Navier-Stokes) – based tools can accurately capture all underlying phenomena without relying on limiting assumptions. This paper presents an attempt at comparing some results obtained via a CFD-based RANS solver and the slender body theory for critical outer flow in a dredged channel.

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“…The dimensions of the computational domain satisfy the well-known ITTC procedure. Detailed information about the principles of computational domain dimensions' selection strategy can be found in [18] and [19]. Also, a detailed description of the boundary conditions is given in [28].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Free Surface Flow Simulation Around an Appended Ship Hull

Özdemir

Barlas

2018

brod

Self Cite

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This study brings forward the results of previously published work of free surface flow simulation around a fast ship model. Experimental measurements and numerical simulations of a fast bare-hull ship model form are now extended to the same ship form with appendices for a wide range of Froude numbers. The governing equations are discretized by means of an unstructured finite volume mesh. The standard k-ε turbulence model and Volume of Fluid Method to capture the two phase media are used. The total resistance, due to wave and wake fields of the ship model with appendages and the resistance of the appendages alone are calculated numerically, and compared with the experiments. The experiments and computations were performed for 11 different Froude numbers between 0.103 and 0.322. For Froude numbers up to 0.25, numerical simulations found to be quite in agreement with the experiments. It has been found that appendages increase the total drag mainly by increasing the pressure resistance, and the effect of the appendages becomes more important as the flow speed gets higher.

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A Numerical Application to Predict the Resistance and Wave Pattern of Kriso Container Ship

Cited by 20 publications

References 21 publications

Application of eddy-viscosity turbulence models to problems in ship hydrodynamics

Application of eddy-viscosity turbulence models to problems in ship hydrodynamics

Influence of Mixed Flows on Ship Hydrodynamics in Dredged Channels

Free Surface Flow Simulation Around an Appended Ship Hull

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