Abstract
With the implement of ship energy efficiency design index (EEDI), computational fluid dynamics (CFD) technique has become an effective method to predict the ship performance and further guide the designers to optimize hull lines. However, due to the complexity of the propeller-hull interactions and the ship’s complex motions in waves, accurately predicting the speed-power performance of a self-propelled ship in actual seaway remains a challenge. In the present work, firstly, the resistance and self-propulsion experiments of Aframax model in waves are carried out at FORCE towing tank. Then, the CFD model and method are adopted to investigate the resistance and thrust under the conditions of regular and irregular waves in a three-dimensional numerical wave tank created by commercial software Star-CCM+. Therein, Reynolds-Averaged Navier–Stokes (RANS) equations and k-ε turbulent models were used for modeling the turbulent flow, and volume of fluid (VOF) method was applied to track the location and shape of transit-free surface. Based on the numerical method, the added resistance caused by regular waves was firstly investigated, and the self-propulsion of propeller in irregular waves was further performed. Furthermore, in order to simulate the rotation of the propeller, both the sliding mesh technique and overset mesh technique were discussed. Finally, compared with the experimental data, the numerical solutions have been validated, which shows potential to provide theoretical guidance and technical support for the self-propulsion performance of Aframax tanker in waves.
Highlights
MethodsNumerical Method to Simulate SelfPropulsion of Aframax Tanker in Irregular WavesGui-sheng Peng, Yang Gao, Wang Wen-hua ,1 Lin Lin, and Yi Huang 1Received 26 September 2019; Revised 24 February 2020; Accepted 5 March 2020; Published 4 April 2020Academic Editor: Alessandro TasoraWith the implement of ship energy efficiency design index (EEDI), computational fluid dynamics (CFD) technique has become an effective method to predict the ship performance and further guide the designers to optimize hull lines
The resistance and selfpropulsion experiments of Aframax model in waves are carried out at FORCE towing tank. en, the computational fluid dynamics (CFD) model and method are adopted to investigate the resistance and thrust under the conditions of regular and irregular waves in a three-dimensional numerical wave tank created by commercial software Star-CCM+. erein, Reynolds-Averaged Navier–Stokes (RANS) equations and k-ε turbulent models were used for modeling the turbulent flow, and volume of fluid (VOF) method was applied to track the location and shape of transit-free surface
Numerical Models and Boundary Conditions. e present numerical simulations in this paper were created by using the commercial solver Star-CCM + based on CFD theory. erein, Reynolds-Averaged Navier–Stokes (RANS) equations and SST k-ω model were applied to model the turbulent flow, which were discretized by the implicit unsteady method. en, the VOF Waves model is taken to simulate surface gravity waves on an air-water interface by use of wave-making technique. e artificial wave damping is introduced to avoid the undesirable effect of the reflect waves from the outlet boundaries, which is applied by adding a resistance term to the equation for w- velocity [23]
Summary
Numerical Method to Simulate SelfPropulsion of Aframax Tanker in Irregular WavesGui-sheng Peng, Yang Gao, Wang Wen-hua ,1 Lin Lin, and Yi Huang 1Received 26 September 2019; Revised 24 February 2020; Accepted 5 March 2020; Published 4 April 2020Academic Editor: Alessandro TasoraWith the implement of ship energy efficiency design index (EEDI), computational fluid dynamics (CFD) technique has become an effective method to predict the ship performance and further guide the designers to optimize hull lines. En, the CFD model and method are adopted to investigate the resistance and thrust under the conditions of regular and irregular waves in a three-dimensional numerical wave tank created by commercial software Star-CCM+. Based on the numerical method, the added resistance caused by regular waves was firstly investigated, and the self-propulsion of propeller in irregular waves was further performed. Compared with the experimental data, the numerical solutions have been validated, which shows potential to provide theoretical guidance and technical support for the self-propulsion performance of Aframax tanker in waves. E ratio ensures that the mesh on the free surface is not particular “narrow.” erein, the half computational domain and boundary conditions together with the meshes can be referred as Figure 4. In the numerical simulation on test cases of regular and irregular waves, the overset grid technique was taken to handle the large-amplitude motion of ship in waves.
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