A Numerical Ventilation Problem on Fridsma Hull Form Using an Overset Grid System

Samuel, Samuel; Kim, D J; Fathuddiin, Abubakar; Zakki, Ahmad Fauzan

doi:10.1088/1757-899x/1096/1/012041

Cited by 11 publications

(7 citation statements)

References 4 publications

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“…Validation with a benchmark Fridsma hull has been done. When using the overset grid system as described in [8], five different grid types were used to perform CFD verification, which are 0.48 M, 0.89 M, 1.44 M, 2.33 M, and 2.99 M. The number of cells 2.3 M and 2.99 M show convergence results, according to numerical simulation analyses. However, the number of grid mesh 2.99 M requires more time to complete simulations than 2.3 M. As a result, grid mesh 2.3 M was used for the rest of the CFD simulations.…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

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An analysis of the effect of the bow entrance angle on ship resistance

Samuel

S.²,

Trimulyono³

et al. 2022

Sinergi

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Modifying the hull shape is one of the challenges in designing a ship. The angle of the ship's entrance is a significant determinant of the total resistance of the ship. This research aimed to analyze the total resistance of the ship due to changes in the shape of the ship's bow. This research used the Computational Fluid Dynamics (CFD) method with overset mesh technique to predict the ship's total resistance and trim angle. Parameters used in the five-speed numerical simulations. This research indicated that a change in the bow angle of the ship results in a 5% change in the ship's resistance for every change in the bow entrance angle. Therefore, the prediction of total resistance shows significant results in planning conditions. Compared to another bow entrance angle at low Fr, total resistance has no noticeable differences. Angle changes of the entrance of the ship's bow also significantly affected the trim conditions on the ship according to the speed. At Fr 1.03, the stern trim angle tended to decrease dramatically. As a result, the trim by stern under porpoising probably oscillates considerably.

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Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…A numerical ventilation issue arises in numerical simulation research. Studies have been done to predict the overall drag of highspeed vessels [8].…”

Section: Introductionmentioning

confidence: 99%

An analysis of the effect of the bow entrance angle on ship resistance

Samuel

S.²,

Trimulyono³

et al. 2022

Sinergi

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“…A benchmark study of high-speed crafts is recommended for future research, especially at Froude numbers Fr > 1. A phenomenon such as the so-called numerical ventilation should be considered [30], When the speed increases, the volume of air diffused below the ship's hull also increases due to the expected high trim of the vessel. The FINE /Marine CFD code was applied to simulate the viscous flow around the DTMB 5415 hull at a relatively low Froude number, Fr = 0.248.…”

Section: Grid Independence Testsmentioning

confidence: 99%

Benchmark Study of FINETM/Marine CFD Code for the Calculation of Ship Resistance

Firdhaus

Suastika

Kiryanto

et al. 2021

Kapal

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Benchmarking can be used to test CFD programs for selecting turbulence models, grid dependency studies, testing different numerical schemes and source codes, and testing different boundary conditions. CFD simulation in this study uses FINE™/Marine 7.2-1 software. The solver process at NUMECA uses the ISIS-CFD flow solver developed by EMN, which uses the incompressible unsteady Reynolds-average Navier stoke equation (RANSE). The solver is based on the finite volume method, and Turbulence models use SST k-ω models. The free surface flow around a model surface ship (DTMB 5415) advancing in calm water under steady conditions is numerically simulated. The geometry of the DTMB 5415 ship hull was provided in igs file format. The 1996 International Towing Tank Conference has recommended the DTMB 5415 combatant as a benchmark case for CFD computations of ship resistance and propulsion. The results compare well with the available experimental data. They allow an understanding of the differences that can be expected from vicious and potential flow methods due to their different mathematical formulations. It is demonstrated that the complementary application of these methods allows good predictions of the total ship resistance.

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“…The meshing techniques that researchers often use are the overset mesh [5], morphing mesh [6], and moving mesh [7]. In 2021, research was carried out on fridsma hull ships using an overset mesh system to reduce numerical ventilation problems [8]. Previously, research was conducted on the RBF (radial basis functions)-based grid morphing mesh system [9].…”

Section: Introductionmentioning

confidence: 99%

Meshing generation strategy for prediction of ship resistance using CFD approach

Yulianti

Samuel²,

Nainggolan³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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CFD is a numerical approach used to solve fluid problems. In the CFD simulation process, the meshing stage is crucial to produce high accuracy. Meshing is a process where the geometric space of an object is broken down into many nodes to translate the physical components that occur while representing the object’s physical shape. The research objective was to analyze the characteristics of the mesh technique in the Finite Volume Method (FVM) using the RANS (Reynolds - Averaged Navier - Stokes) equation. The numerical simulation approach used three mesh techniques, namely overset mesh, morphing mesh, and moving mesh. The k-ε turbulent model and VOF (Volume of Fluid) were used to model the water and air phases. The mesh technique approach in CFD simulation showed a pattern under experimental testing. This research showed the difference in value to the experimental results, namely by using the moving mesh method, the difference in resistance difference was 8% at high-speed conditions, the difference in trim value at overset mesh was 11%, and the difference in heave value with the moving mesh method was 14% at low speed. The conclusion reported that overset mesh had better than other mesh methods.

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A Numerical Ventilation Problem on Fridsma Hull Form Using an Overset Grid System

Cited by 11 publications

References 4 publications

An analysis of the effect of the bow entrance angle on ship resistance

An analysis of the effect of the bow entrance angle on ship resistance

Benchmark Study of FINETM/Marine CFD Code for the Calculation of Ship Resistance

Meshing generation strategy for prediction of ship resistance using CFD approach

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