Application of pressure‐ and density‐based methods for different flow speeds

Miettinen, Ari; Siikonen, Timo

doi:10.1002/fld.4051

Cited by 27 publications

(13 citation statements)

References 56 publications

(115 reference statements)

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“…In Equation 6, a Rhie-Chow-type damping term is added via the convective velocityū. Instead of the commonly used scaling, the term is scaled using an artificial sound speed [40]. Pressure differences are applied and the flux terms are written in terms of the void fraction.…”

Section: Finite-volume Formmentioning

confidence: 99%

See 1 more Smart Citation

DDES of Wetted and Cavitating Marine Propeller for CHA Underwater Noise Assessment

Viitanen

Hynninen

Sipilä

et al. 2018

JMSE

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In this paper we present results of delayed detached eddy simulation (DDES) and computational hydroacoustics (CHA) simulations of a marine propeller operating in a cavitation tunnel. DDES is carried out in both wetted and cavitating conditions, and we perform the investigation at several propeller loadings. CHA analyses are done for one propeller loading both in wetted and cavitating conditions. The simulations are validated against experiments conducted in the cavitation tunnel. Propeller global forces, local flow phenomena, as well as cavitation patterns are compared to the cavitation tunnel tests. Hydroacoustic sources due to the propeller are evaluated from the flow solution, and corresponding acoustic simulations utilizing an acoustic analogy are made. The propeller wake flow structures are investigated for the wetted and cavitating operating conditions, and the acoustic excitation and output of the same cases are discussed.

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Section: Finite-volume Formmentioning

confidence: 99%

“…A pressure correction equation was derived from the continuity Equation (1) linked with the linearized momentum equation. The method is based on the corresponding algorithm for a single-phase flow [40], and is described in detail in Ref. [25].…”

Section: Solution Algorithmmentioning

confidence: 99%

DDES of Wetted and Cavitating Marine Propeller for CHA Underwater Noise Assessment

Viitanen

Hynninen

Sipilä

et al. 2018

JMSE

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show abstract

“…A detailed description of the numerical method including discretization of the governing equations, solution algorithm, boundary conditions, etc. are described by Sánchez-Caja et al [28] and by Miettinen and Siikonen [29]. Several turbulence models are implemented in FINFLO.…”

Section: Viscous Modelmentioning

confidence: 99%

On the optimum performance of oscillating foil propulsors

Sánchez-Caja

Martio

2016

J Mar Sci Technol

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The design of oscillating foil propulsors is considerably more complex than that of conventional propellers due to the large amount of geometric and kinematic parameters involved in the problem. No general use of such promising propulsion concept is made routinely yet since many open questions remain to be solved. One of such questions is the sensitivity of the propulsor efficiency to foil chord length that is much larger than for conventional propellers. Our focus is on this particular problem. A potential flow theory that estimates the main force components affecting the global performance of such devices is presented. The theory is applied to oscillating foils with heaving and pitching motions and to wheel propellers with foils describing trochoidal paths. Added mass terms that usually are neglected in efficiency analyses and that play an important role in determining the global performance are included. A parameter optimization procedure is introduced in this context. Comparison to experimental data and RANS computations is made.

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“…The flow model applied is based on a homogeneous mixture flow assumption, and a compressible form of the Navier-Stokes equations is solved [9,10]. The continuity and momentum equations are solved for the mixture, and the energy equations are included to predict the correct acoustic signal speeds.…”

Section: Governing Equationsmentioning

confidence: 99%

“…A pressure correction equation was derived from the continuity equation, Equation 1, linked with the linearized momentum equation. The velocity-pressure coupling is based on the corresponding algorithm for a single-phase flow [9], and is described in more detail in [10,25].…”

Section: Solution Algorithmmentioning

confidence: 99%

Cavitation on Model- and Full-Scale Marine Propellers: Steady And Transient Viscous Flow Simulations At Different Reynolds Numbers

Viitanen

Siikonen

Sánchez-Caja

2020

JMSE

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In this paper, we conducted numerical simulations to investigate single and two-phase flows around marine propellers in open-water conditions at different Reynolds number regimes. The simulations were carried out using a homogeneous compressible two-phase flow model with RANS and hybrid RANS/LES turbulence modeling approaches. Transition was accounted for in the model-scale simulations by employing an LCTM transition model. In model scale, also an anisotropic RANS model was utilized. We investigated two types of marine propellers: a conventional and a tip-loaded one. We compared the results of the simulations to experimental results in terms of global propeller performance and cavitation observations. The propeller cavitation, near-blade flow phenomena, and propeller wake flow characteristics were investigated in model- and full-scale conditions. A grid and time step sensitivity studies were carried out with respect to the propeller performance and cavitation characteristics. The model-scale propeller performance and the cavitation patterns were captured well with the numerical simulations, with little difference between the utilized turbulence models. The global propeller performance and the cavitation patterns were similar between the model- and full-scale simulations. A tendency of increased cavitation extent was observed as the Reynolds number increases. At the same time, greater dissipation of the cavitating tip vortex was noted in the full-scale conditions.

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Application of pressure‐ and density‐based methods for different flow speeds

Cited by 27 publications

References 56 publications

DDES of Wetted and Cavitating Marine Propeller for CHA Underwater Noise Assessment

DDES of Wetted and Cavitating Marine Propeller for CHA Underwater Noise Assessment

On the optimum performance of oscillating foil propulsors

Cavitation on Model- and Full-Scale Marine Propellers: Steady And Transient Viscous Flow Simulations At Different Reynolds Numbers

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