Numerical and experimental investigation of three-dimensional cavitating flow around the straight NACA2412 hydrofoil

Sedlář, Milan; Wang, Xincheng; Krátký, Tomáš; Rebok, Tomáš; Huzlik, Rostislav

doi:10.1016/j.oceaneng.2016.07.030

Cited by 43 publications

(12 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the homogenous multiphase flow, each fluid phase is assumed to share the same velocity and pressure field. The basic governing equations contain the mass and momentum conservation equations, shown as Equations (1) and 2:…”

Section: Numerical Methods and Validationmentioning

confidence: 99%

See 1 more Smart Citation

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Chen²,

Yang

et al. 2018

Energies

View full text Add to dashboard Cite

In this paper, the turbulent attached cavitating flows around two different twisted hydrofoils, named as NACA0009 and Clark-y, are studied numerically, with emphasis on cavity shedding dynamic behavior and the turbulence flow structures. The computational method of large eddy simulation (LES) coupled with a homogeneous cavitation model is applied and assessed by previous experimental data. It was found that the predicted results were in good agreement with that of the experiment. The unsteady cavity morphology of the two hydrofoils undergoes a similar quasi-periodic process, but has different shedding dynamic behavior. The scale of the U-type shedding structures forming on the suction surface of NACA0009 is larger than that of Clark-y. This phenomenon is also present in the iso-surface distributions of Q-criterion. Otherwise, the time-averaged cavity morphology is dramatically different for the two hydrofoils, and it is found that the attached location of the cavity is closely related to the hydrofoil geometry. The time fluctuation of the lift force coefficients is affected significantly by the cavity shedding dynamics. Compared with NACA0009, the lift force of Clark-y shows more fluctuation, due to its complicated shedding behavior. Further analysis of the turbulent structure indicates that the more violent shedding behaviors can induce higher levels of turbulence velocity fluctuations.

show abstract

Section: Numerical Methods and Validationmentioning

confidence: 99%

“…Cavitation is a very important flow phenomenon that influences the design and operation of hydraulic machines [1][2][3][4], such as pumps, ship propellers, and turbomachinery. A better understanding of the cavitating flow mechanism is substantially necessary for effective cavitation control in engineering designs [5].…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Chen²,

Yang

et al. 2018

Energies

View full text Add to dashboard Cite

show abstract

“…The presented simulations are based on the measurements and visualizations Journal of Applied Mathematics and Physics which have been performed in the cavitation tunnel at the Centre of Hydraulic Research, Czech Republic [11]. The facility is a horizontal plane water tunnel for isolated hydrofoils (Figure 1).…”

Section: Case Descriptionmentioning

confidence: 99%

“…That is why the full geometry of the tunnel test section including both side walls is included into the computational domain. This paper does not focus on the details of the experiment and detailed description of the numerical procedure; these details can be found in[11]. In this reference three SRS turbulence models were tested (SAS, LES-WALE and DES).…”

mentioning

confidence: 99%

Numerical Simulation of Interaction between Fluid and Vapor Structures in Multiphase Flow around Hydrofoil

Sedlář¹,

Šoukal²,

Komárek³

et al. 2018

JAMP

View full text Add to dashboard Cite

This work deals with the numerical simulation of interaction of fluid and vapor structures on NACA 2412 hydrofoil during the partial cavitation oscillation. This interaction is supposed to be the most important reason for the cavity shedding when, in a certain range of the cavitation numbers, some "resonance" effect can be reached. The incidence angle is 8˚ and the Reynolds number is 1.56 × 10 6. The hydrofoil with the span/chord ratio of 1.25 corresponds to the experiments carried out in the cavitation tunnel. The Detached Eddy Simulation (DES) is used on full 3D geometry of the straight NACA 2412 hydrofoil to capture the strong influence of side-wall effects. Real properties of water including estimated content of undissolved air are considered to affect the compressibility of the mixture and its speed of sound. The link between strong pressure pulses during the cavity cycles and the interaction of fluid and vapor structures is discussed in detail.

show abstract

“…The objective of the optimization is the reduction of the hydrodynamic drag at several BS and lift conditions, with cavitation constraints. Cavitation is indeed an important concern for the hydrofoil performance [Sedlar et al 2016], but its numerical prediction remains a difficult problem, as shown for instance in Leroux et al [2005], Coutier-Delgosha et al [2007], Ducoin et al [2009], Akcabay et al [2014]. These difficulties explain that cavitation aspects are usually not considered in hydrofoil shape optimization, unless when the objective is precisely to delay the cavitation, such as in WEI et al [2015].…”

Section: Introductionmentioning

confidence: 99%

Flexible hydrofoil optimization for the 35th America's Cup with constrained EGO method

et al. 2018

View full text Add to dashboard Cite

This paper investigates the use of constrained surrogate models to solve the multi-design optimization problem of a flexible hydrofoil. The surrogate-based optimization (EGO) substitutes the complex objective function of the problem by an easily evaluable model, constructed from a limited number of computations at carefully selected design points. Associated with ad-hoc statistical strategies to propose optimum candidates within the estimated feasible domain, EGO enables the resolution of complex optimization problems. In this work, we rely on Gaussian processes (GP) to model the objective function and adopt a probabilistic classification method to treat non-explicit inequality constraints and non-explicit representation of the feasible domain. This procedure is applied to the design of the shape and the elastic characteristics of a hydrofoil equipped with deformable elements providing flexibility to the trailing edge. The optimization concerns the minimization of the hydrofoil drag while ensuring a non-cavitating flow, at selected sailing conditions (boat speed and lifting force). The drag value and cavitation criterion are determined by solving a two-dimensional nonlinear fluid-structure interaction problem, based on a static vortex lattice method with viscous boundary layer equations, for the flow, and a nonlinear elasticity solver for the deformations of the elastic components of the foil. We compare the optimized flexible hydrofoil with a rigid foil geometrically optimized for the same sailing conditions. This comparison highlights the hydrodynamical advantages brought by the flexibility: a reduction of the drag over a large range of boat speeds, less susceptibility to cavitation and a smaller angle of attack tuning range.

show abstract

Numerical and experimental investigation of three-dimensional cavitating flow around the straight NACA2412 hydrofoil

Cited by 43 publications

References 53 publications

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Numerical Simulation of Interaction between Fluid and Vapor Structures in Multiphase Flow around Hydrofoil

Flexible hydrofoil optimization for the 35th America's Cup with constrained EGO method

Contact Info

Product

Resources

About