Study of the unsteady propeller loadings under maneuvering conditions using URANS and hybrid URANS-LES methods
Nawar Abbas, Nikolai Kornev, Universität Rostock
Study of the unsteady propeller loadings under maneuvering conditions using URANS and hybrid URANS-LES methods
Nawar Abbas, Nikolai Kornev, Universität Rostock
The results of computations of the unsteady wake and unsteady loadings on marine propellers behind the KVLCC2 tanker model under simple manoeuver conditions (only drift angle) and complete maneuvering (drift angle and yaw rate) using different numerical methods are be presented and analyzed. The hybrid URANS-LES model proposed in [1, 2], the hybrid IDDES and the k-ω-SST model are applied first for the bare hull at different drift angles, and then under complete maneuvering conditions (different drift angles and yaw rates). The forces and moment coefficients of the bare hull calculations under different drift angles were compared with the experimental results of Kume et al. [3]. In the second series of calculations the arrangement containing both the ship and rotating propeller is computed with consideration of all interaction effects at different drift angles. Under complete maneuvering condition the whole system (ship, rudder and propeller) was calculated using the hybrid method [1, 2]. CFD results for the time averaged thrust were compared with the experimental results [4].
[1]- Kornev N., Taranov A., Shchukin E., & Kleinsorge L. 2011. "Development of hybrid URANS-LES methods for flow simulation in the ship stern area." Ocean Engineering, 38(16), 1831-1838.
[2]- Abbas, N., Kornev, N., Shevchuk, I., and Anschau, P. 2015. CFD prediction of unsteady
forces on marine propellers caused by the wake nonuniformity and nonstationarity. Ocean Engineering, 104, 659-672.
[3]- Kume, K., Hasegawa, J., Tsukada, Y., Fujisawa, J., Fukasawa, R., and Hinatsu, M. 2006. Measurements of hydrodynamic forces, surface pressure, and wake for obliquely towed tanker model and uncertainty analysis for CFD validation. Journal of marine science and technology, 11(2), 65-75.
[4]- Ueno, M., Yoshimura, Y., Tsukada, Y., and Miyazaki, H. 2009. Circular motion tests and uncertainty analysis for ship maneuverability. Journal of marine science and technology, 14(4), 469-484.
