CFD Simulation on Predicting POW Performance Adopting Laminar-Turbulent Transient Model

Kim, Dong-Hyun; Jeon, Gyu-Mok; Park, Jong-Chun; Shin, Myung-Soo

doi:10.3744/snak.2021.58.1.001

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…In a study with another fluid, water in this case, the γ-Re θ transition model is also used to simulate the transition from laminar to turbulent flow, under conditions of Re = 7x10 5 , over the blades of a propeller. This research concludes that the transition model accurately reproduces the experimental results, in particular the position and shape of the boundary layer, and thus of the laminar separation bubble [17].…”

Section: Introductionsupporting

confidence: 66%

“…In Table 1 the angle of attack step is 2°. Within the computational domain the airfoil of interest is placed, in this case three airfoils are studied, namely, the S826 which is also used in [16] and it is with respect to which the results obtained are compared; then the airfoils SG6043 and NACA0012, in which it is known that laminar separation occurs according to [17]. In the case of the three profiles, the no-slip condition is imposed on the entire contour.…”

Section: Boundary For Airfoils Under Studymentioning

confidence: 99%

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Laminar separation bubbles on the transitional flow around airfoils

Montenegro-Montero

Navarro

2022

RECyT

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The purpose of this work is to apply the γ-Re θ turbulence model, which is one of the numerical methods of shear stress transport (SST) applicable to transient flow, to examine if it shows the expected laminar separation cells or bubbles. This condition is key in the way to guarantee that the numerical modeling of lift and drag forces in aerodynamic profiles is more faithful to corresponding experimental data. For this, several two-dimensional simulations implemented with OpenFOAM, a well-known Finite Volume Method (FVM) package, were carried out for a Reynolds number range between 1x10 4 and 5x10 , with the airfoils NACA0012, SG6043 and S826, in which the laminar separation bubbles usually form. Numerical results of lift and drag coefficients show correct prediction of experimental results and error is reduced by 3% when compared to other simulations. In particular, adequate performance of the model is observed for regions close to or greater than the angle of attack for which the aerodynamic profile stalls. On the other hand, the geometric footprint of the flow simulated with this γ-Re 5 transition SST model shows great improvement compared to previous studies regarding the formation of laminar separation bubbles, which in turn means better performance when calculating lift and drag coefficients. It is also concluded that laminar separation occurs in the three studied airfoils, being symmetric or asymmetric profiles.

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Section: Introductionsupporting

confidence: 66%

Section: Boundary For Airfoils Under Studymentioning

confidence: 99%

Laminar separation bubbles on the transitional flow around airfoils

Montenegro-Montero

Navarro

2022

RECyT

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“…It is widely known that laminar flow exists at the non-negligible ratio on the propeller surface at the model-scale with the laminar-turbulent transition phenomenon [25][26][27][28]. With recently continuous development of numerical models, some numerical models capable of implementing laminar-turbulent transition are being developed and various studies [29][30][31][32][33][34] have applied the transition model to the model-scale propeller analysis. In most studies, when the transition model is applied, analysis results are similar to results of experiments.…”

Section: Turbulence Modelmentioning

confidence: 99%

“…This simplified application might degrade the accuracy of the laminar-turbulent transition prediction. However, Kim et al [34] have shown that the most laminar-turbulence transition on the surface of the model propeller is bypass transition by the strong turbulence intensity around the propeller tip vortex, not delicate natural transition with the development of the boundary layer. So, the uncertainty in transition point prediction due to simplified model is not expected to significantly undermine the reliability of simulations.…”

Section: Turbulence Modelmentioning

confidence: 99%

CFD Simulation for Estimating Efficiency of PBCF Installed on a 176K Bulk Carrier under Both POW and Self-Propulsion Conditions

et al. 2021

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In this paper, the efficiency of Propeller Boss Cap Fins (PBCF) installed at the bulk carrier was estimated under both Propeller Open Water (POW) and self-propulsion conditions. For this estimation, virtual model-basin tests (resistance, POW, and self-propulsion tests) were conducted through Computational Fluid Dynamics (CFDs) simulation. In the resistance test, the total resistance and the wake distribution according to ship speed were investigated. In the POW test, changes of thrust, torque coefficient, and open water efficiency on the propeller according to PBCF installation were investigated. Finally, the International Towing Tank Conference (ITTC) 1978 method was used to predict the effect of PBCF installation on self-propulsive coefficient and brake horsepower. For analyzing incompressible viscous flow field, the Reynolds-Averaged Navier–Stokes (RANS) equation with SST k-ω turbulence model was calculated using Star-CCM+ 11.06.010-R8. All simulation results were validated by comparing the results of model tests conducted at the Korea Research Institute of Ships and Ocean Engineering (KRISO). Consequently, for the self-propulsion test with the PBCF, a 1.5% reduction of brake horsepower was estimated in the simulation and a 0.5% reduction of the brake horsepower was estimated in the experiment.

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A numerical study on the optimization of the slit shape of a jet injection propeller

Lee,

Kim

et al. 2024

International Journal of Naval Architecture and Ocean Engineeri

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CFD Simulation on Predicting POW Performance Adopting Laminar-Turbulent Transient Model

Cited by 3 publications

References 13 publications

Laminar separation bubbles on the transitional flow around airfoils

Laminar separation bubbles on the transitional flow around airfoils

CFD Simulation for Estimating Efficiency of PBCF Installed on a 176K Bulk Carrier under Both POW and Self-Propulsion Conditions

A numerical study on the optimization of the slit shape of a jet injection propeller

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