Numerical prediction of the flow past a 2-D planing plate at low Froude number

Kramer, Matthew R.; Maki, Kevin J.; Young, Yin Lu

doi:10.1016/j.oceaneng.2013.06.004

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…A preliminary study on a 2D fixed flat plate was carried out in order to validate the model against previous work. The problem of a two-dimensional planing flat plate studied using a nonlinear CFD solver for varying Froude number and angle of studied by Kramer (Kramer et al, 2013) was chosen for the comparative study. In Kramer's work a quasi-steady CFD approach using inviscid flow was used and potential-flow assumptions that either assume linear free-surface and body boundary conditions or ignore gravitational effects were also addressed.…”

Section: Model Validationmentioning

confidence: 99%

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Numerical Comparison between a Modern Surfboard and an Alaia Board using Computational Fluid Dynamics (CFD)

Oggiano¹

2017

Proceedings of the 5th International Congress on Sport Sciences Research and Technology Support

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Surfboard design is traditionally considered more as an art than an engineering process. However, in the past decade, the use of computers is becoming the standard in the shaping process. In the design part the use of computer-aid-design (CAD) software, has simplified the design process allowing shapers to save time and consistently modify or reproduce similar designs. At the same time, the improvement of computernumerical-controlled (CNC) machines is slowly replacing the traditional hand shaping techniques with more controlled and reproducible manufacturing process. Another considerable advantage about having a 3D CAD model of the surfboard is that the model can be imported in Computational Fluid Dynamics (CFD) programs and its performances can be studied and evaluated highlighting details that would be otherwise impossible to identify from a field test. The present paper aims to show the potential of CFD solvers for surfboard design and its applicability by comparing a modern surfboard with a traditional ancient surfboard design (alaia). The performances of the modern surfboard are evaluated and compared with the alaia board, represented by an equivalent flat plate which is also used for validation. The commercial CFD code STAR-CCM+ is used in the present work. An Unsteady Reynolds Navier Stokes (URANS) approach is used, the volume of fluid (VOF) method is chosen as free surface discretization method and the turbulence model chosen to allow the numerical closure of the RANS equations is the k-ɷ-SST proposed by Menter. The model validation on an alaia board, represented as a flat plate shows good agreement with previous studies and the comparison between the surfboard and the alaia addresses the superiority of the modern surfboard design in terms of stability. Oggiano L. Numerical Comparison between a Modern Surfboard and an Alaia Board using Computational Fluid Dynamics (CFD).

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Section: Model Validationmentioning

confidence: 99%

“…While the studies on surfboards are limited, the studies on planing surfaces are present in the literature and CFD proved to a useful tool to study the physics of the phenomenon. In particular Kramer (Kramer et al, 2013) studied with CFD at 2D flat plate similar in size of a alaia board.…”

Section: Introductionmentioning

confidence: 99%

Numerical Comparison between a Modern Surfboard and an Alaia Board using Computational Fluid Dynamics (CFD)

Oggiano¹

2017

Proceedings of the 5th International Congress on Sport Sciences Research and Technology Support

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“…It is well known that the flow around a planing plate, especially behind its step obeys Navier-Stokes equations due to flow separation (which can cause shear stresses). 39 Therefore, to solve the problem, the fluid is assumed to be viscous. The domain is considered to be two dimensional (2D).…”

Section: Governing Equationsmentioning

confidence: 99%

Effects of step configuration on hydrodynamic performance of one- and doubled-stepped planing flat plates: A numerical simulation

Dashtimanesh

Roshan

Tavakoli

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part M:

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Categorized as one of high-speed marine vehicles, stepped planing hulls have the potential to reach relatively high speed in the sea by decreasing wetted surface. There were and still are some challenges in modeling of these vessels and design of ideal situation of steps. In the current study, a numerical-based method has been used to provide understanding about the effect of step height and its location on hydrodynamic characteristics of double-stepped planing plates. At the first step, one-stepped planing plate is numerically simulated. Results are compared against exiting numerical data, suggesting that results of the current numerical simulation are similar to results of previous numerical simulations. Then, double-stepped planing plates are modeled and pressure distribution, wetted length, free surface elevation and drag over lift ratio are computed. It is seen that, ventilation length behind the step and pressure coefficient are increased when step height of one- and a double-stepped planing plates are increased. It has been shown that, unlike an one-stepped planing plate, drag coefficient of a double-stepped planing plate can be increased when the step height is increased. The effects of the location of the second step on the performance of the planing plate have been explored, showing that this position plays a critical role on hydrodynamic forces. It is demonstrated that when the smallest possible lift force is produced by the middle-body, the plate shows the best performance (highest lift over drag ratio).

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“…While the studies on surfboards are limited, studies on planing surfaces are present in the literature and CFD proved to a useful tool to study the physics of the phenomenon. In particular Kramer [3] studied with CFD at 2D flat plate which can be compared with a simplified version of a surfboard, and Oggiano [4] studied and compared a traditional alaia board with a modern surfboard.…”

Section: Introductionmentioning

confidence: 99%

CFD for Surfboards: Comparison between Three Different Designs in Static and Maneuvering Conditions

Oggiano

Pierella

2018

The 12th Conference of the International Sports Engineering Association

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The present paper aims to show the potential of Computational Fluid Dynamics (CFD) solvers for surfboard design and its applicability by comparing three different surfboards with minimal changes in design. In fact, surfboard manufacturing routines are moving towards more controlled and reproducible manufacturing processes, in particular Computer numerically controlled (CNC) shaping techniques. As a consequence, three dimensional (3D) computer models of the boards start to be available, and can be imported in Computational Fluid Dynamics (CFD) programs. This opens up a new design methodology, where the performances of the different shapes can be studied and quantitatively evaluated, highlighting details that would be otherwise impossible to identify from a field test. The commercial CFD code STAR-CCM+ is used in the present work to compare the performance of three different surfboards, with different curvature at the bottom and different tail shapes. In the simulations, an Unsteady Reynolds Navier Stokes (URANS) approach is used, with the volume of fluid (VOF) method as free surface discretization method and the k-omega-SST turbulence model as numerical closure of the RANS equations. CFD proved to be a valid tool to compare the performances of the different shapes, bringing into light subtle but important differences between the designs. In particular, the static simulations showed that the rocker affects the performances by increasing the lift but also the drag of the board, also generating higher forces in maneuvering conditions. On the other hand, the tail shape did not affect the performances of the board in the analyzed cases.

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Numerical prediction of the flow past a 2-D planing plate at low Froude number

Cited by 10 publications

References 12 publications

Numerical Comparison between a Modern Surfboard and an Alaia Board using Computational Fluid Dynamics (CFD)

Numerical Comparison between a Modern Surfboard and an Alaia Board using Computational Fluid Dynamics (CFD)

Effects of step configuration on hydrodynamic performance of one- and doubled-stepped planing flat plates: A numerical simulation

CFD for Surfboards: Comparison between Three Different Designs in Static and Maneuvering Conditions

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