CFD results on hydrodynamic performances of a marine propeller

In this work, the commercial Computational Fluid Dynamics (CFD), ANSYS-Fluent V.14.5 has been used to illustrate the effects of rudder and blade pitch on hydrodynamic performances of a propeller. At first, the characteristic curves of a container ship propeller are computed. Then, effects of rudder on hydrodynamic performances of the propeller in the both cases of the propeller with and without rudder have been investigated.
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CFD results on hydrodynamic performances of a marine propellerVietnam Journal of Marine Science and Technology; Vol. 19, No. 3; 2019: 435–447 DOI: https://doi.org/10.15625/1859-3097/19/3/13246 https://www.vjs.ac.vn/index.php/jmstCFD results on hydrodynamic performances of a marine propellerLuong Ngoc Loi1, Nguyen Chi Cong1,2, Ngo Van He1,*1 Hanoi University of Science and Technology, Hanoi, Vietnam2 Vietnam Maritime University, Hai Phong, Vietnam* E-mail: he.ngovan@hust.edu.vnReceived: 31 October 2018; Accepted: 5 January 2019©2019 Vietnam Academy of Science and Technology (VAST)AbstractIn this work, the commercial Computational Fluid Dynamics (CFD), ANSYS-Fluent V.14.5 has been used toillustrate the effects of rudder and blade pitch on hydrodynamic performances of a propeller. At first, thecharacteristic curves of a container ship propeller are computed. Then, effects of rudder on hydrodynamicperformances of the propeller in the both cases of the propeller with and without rudder have beeninvestigated. The relationships between the blade pitch angle and the hydrodynamic performances of theselected referent propeller in this work having designed conditions as diameter of 3.65 m; speed of 200 rpm;average pitch of 2.459 m and the boss ratio of 0.1730. Using CFD, the characteristic curves of the marinepropeller, pressure distribution, velocity distribution around propeller and the efficiency of the propeller havebeen shown. From the obtained results, the effects of rudder and blade pitch angle on hydrodynamicperformances of the propeller have been evaluated.Keywords: CFD, rudder, blade pitch, propeller, hydrodynamic.Citation: Luong Ngoc Loi, Nguyen Chi Cong, Ngo Van He. CFD results on hydrodynamic performances of a marinepropeller. Vietnam Journal of Marine Science and Technology, 19(3), 435–447. 435Luong Ngoc Loi et al.INTRODUCTION (BEM) with a vortex lattice method was At present, the Computational Fluid utilized to model the propeller [3]. Chen Z. etDynamics (CFD) plays important role in al., (2015) used the RANS method to study thesimulating flow fields around different effect of scale on hydrodynamic performancesgeometries using established algorithms. In of a propeller and the obtained results arerecent years, considerable advance in the area relatively appropriate with experimentalof computer science has donated to the outcomes [4]. RANS method combined with k-decrease of computational costs of CFD  turbulent viscous model was used to studysimulations making it more accessible for the unsteady cavitation turbulent flow aroundpractical applications, especially in the process full scale marine propeller [5]. Arnob B. et al.,of designing and optimizing ship and propeller. (2017) had got some results relating to Simulating the aforementioned experiments computation of hydrodynamic characteristic ofprovides the opportunity to obtain desired marine propeller using induction factor methodresults by analyzing the calculated flow based on normal induced velocity. Thecharacteristics. It can be a practical way of significant results were that the normal inducedobtaining valid results at relatively low costs velocity of a propeller can be obtained simplyand in reasonable time compared with the real and accurately by means of the inductionexperiments. Since the self-propulsion test factor. The vertical theory based on Biot-Savartsimulation is still quite expensive and time law was used to find the induction factor, thendemanding, the common practice is to simulate the hydrodynamic characteristics of theonly the open water test and to use its results to propeller were estimated [6]. In addition to thisdetermine self-propulsion characteristics. It can area, the important results of simulating,be done without taking into account factors analyzing and optimizing the characteristics ofincluding the interaction between the ship hull a marine propeller were presented by Hu J. etand the propeller. al., (2017), Lin Y. et al., (2017) and Wang Z. et Takayuki W. et al., (2003) used the Ansys al., (2012), [7–9]. The obtained results in thefluent software to study unsteady cavitation on studies on effects of geometry configuration ona marine propeller. In his research, the hydrodynamic performances of a propellerReynolds Averaged Navier Stockes (RANS) proposed the innovative way to designwas solved to ...