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http://dx.doi.org/10.3744/SNAK.2022.59.3.141

Computational Simulations of Turbulent Wake Behind a Pre-Swirl Duct Using a Hybrid Turbulence Model with High Fidelity  

Kang, Min Jae (Department of Naval Architecture and Offshore Engineering, Dong-A University)
Jung, Jae Hwan (Korea Research Institue of Ships and Ocean Engineering)
Cho, Seok Kyu (Korea Research Institue of Ships and Ocean Engineering)
Hur, Jea-Wook (Ship Performance Research Department, Hyundai Maritime Research Institute, Hyundai Heavy Industries)
Kim, Sanghyeon (Ship Performance Research Department, Hyundai Maritime Research Institute, Hyundai Heavy Industries)
Lee, Sang Bong (Department of Naval Architecture and Offshore Engineering, Dong-A University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.59, no.3, 2022 , pp. 141-148 More about this Journal
Abstract
A hybrid turbulence model has developed by combining a sub-grid scale model using dynamic k equation in LES with k-𝜔 SST model of RANS equation. To ascertain potential applicability of the hybrid turbulence model, fully developed turbulent channel flows at Re𝜏=180 have been simulated of which computational domain has a top wall with coarse cells and a bottom wall with fine cells. The streamwise mean velocity and turbulent intensity profiles showed a good agreement with DNS data when using the hybrid model rather than using a single model in k-𝜔 SST or dynamic k equation models. Computational simulations of turbulent flows around KVLCC2 with a pre-swirl duct have been mainly performed using the hybrid turbulence model. Compared to the results obtained from RANS simulation with k-𝜔 SST model as well as LES with dynamic k equation SGS model, turbulent wakes of the duct in the present simulation using the hybrid turbulence model were very similar to that of LES. Also, the resistances acting on hull, rudder and duct in hybrid turbulence model were similar to those in RANS simulation whereas the viscous forces acting on the hull in LES had a significant error due to coarse cells inappropriate to the sub-grid scale model.
Keywords
Hybrid turbulence model; Pre-swirl duct; OpenFOAM;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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