Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Kahramanoğlu, Emre; Pennino, Silvia; Yilmaz, Hüseyin

doi:10.1177/1475090221990243

Cited by 2 publications

(2 citation statements)

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“…This work will also walk in the light of the use of software and CAD and improve and analysis various systems of the airboat including the seakeeping and the motion response of the vessel. Several others have made significant progress in the study of various aspects of the planning vessel [7], [8], [9], [10], [11]. In the construction of the airboat hull, the stability of the vessel at sea must be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the air-water interface effects of an airboat

Samson Nitonye,

Tamunodukobipi Daniel,

Douglas Ibiba

2024

Global J. Eng. Technol. Adv.

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This paper describes the Air-Water Interface (AWI) occurrence effects of the airboat at various speed, draught, and trim angle. This evaluates the dynamics of AWI with focus on the mechanisms involved in air displacement, the formation of air cushion, boundary layer turbulence, surface tension and wave generation. The analysis involves the change in speed, draught, and trim (0, 1, 1.5 and 2 degrees). The speed of 1.01 and 3.35m/s for displacement and planning regions of the airboat operation were examined. At the AWI, the thin layer of water molecules is affected by the airboat movement at the said trim, it is observed that the layer at the boundary will experience turbulence due to passing air over the layer and the interaction between the air and water at the interface causes mixing and creates waves or ripples at that trim. The wave generated at various trim angles will also create unique wave even at the same speed and draught with a change in trim. The difference in wave formation is seen not to be the same with the change in trim and these changes are observed at the bow and the aft of the vessel. This is also connected to the volume displacement of the boat, the resistance of the vessels, the angle of trim of the airboat and the hull form of the boat. This shows that displacement, resistance, angle of trim and hull form of the boat play critical and crucial roles in wave formation especially for the airboat.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of the air-water interface effects of an airboat

Samson Nitonye,

Tamunodukobipi Daniel,

Douglas Ibiba

2024

Global J. Eng. Technol. Adv.

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“…In another study, Najafi and Nowruzi 15 have carried out hydrodynamic computations for stepped Fridsma hull by analyzing different step configurations and various parameters, such as; number of steps, local height, or transverse shape of them. Kahramanoglu et al 16 have investigated drag and running attitudes of three different type planing hulls by using a hybrid method by coupling 2D potential based solution algorithm with Savitsky method. They have improved accuracy of the common hybrid method by reducing uncertainties of the method.…”

Section: Introduction and Literature Surveymentioning

confidence: 99%

Prediction of drag and lift forces of a high-speed vessel at full scale by CFD-based GEOSIM method

Can

Bal

2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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In this study, it was aimed to obtain an accurate extrapolation method to compute lift and drag forces of high-speed vessels at full-scale by using CFD (Computational Fluid Dynamics) based GEOSIM (GEOmetrically SIMilar) method which is valid for both fully planing and semi-planing regimes. Athena R/V 5365 bare hull form with a skeg which is a semi-displacement type of high-speed vessel was selected with a model family for hydrodynamic analyses under captive and free to sinkage/trim conditions. Total drag and lift forces have been computed for a generated GEOSIM family of this form at three different model scales and full-scale for Fr = 0.8 by an unsteady RANS (Reynolds Averaged Navier–Stokes) solver. k–ε turbulence model was used to simulate the turbulent flow around the hulls, and both DFBI (Dynamic Fluid Body Interaction) and overset mesh technique were carried out to model the heave and pitch motions under free to sinkage/trim condition. The computational results of the model family were used to get “drag-lift ratio curve” for Athena hull at a fixed Fr number and so the corresponding results at full scale were predicted by extrapolating those of model scales in the form of a non-dimensional ratios of drag-lift forces. Then the extrapolated full-scale results calculated by modified GEOSIM method were compared with those of full-scale CFD and obtained by Froude extrapolation technique. The modified GEOSIM method has been found to be successful to compute the main forces (lift and drag) acting on high-speed vessels as a single coefficient at full scale. The method also works accurately both under fully and semi-planing conditions.

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Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

Cited by 2 publications

References 25 publications

Numerical simulation of the air-water interface effects of an airboat

Numerical simulation of the air-water interface effects of an airboat

Prediction of drag and lift forces of a high-speed vessel at full scale by CFD-based GEOSIM method

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