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최소 단어 이상 선택하여야 합니다.
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최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- A fully parametric model of the 10000TEU twin-skeg container vessel was established by using more than 100 parameters. And the parameters of bulb length, inlet angle of forward waterline, distance and angle of two skegs et al., were selected to explore the space of design variants. After establishment of the fully parametric model, the wave-making resistance and total resistance of the 10000TEU container vessel with respect to different parameters was investigated by the integration platform.
- After establishment of the fully parametric model, the wave-making resistance and total resistance of the 10000TEU container vessel with respect to different parameters was investigated by the integration platform. A preliminary optimized variant was obtained by systematic investigation of the parametric models. Based on the initial optimized variants, the influence of twin-skeg parameters on total resistance was studied by CFD analysis, and an optimized variant PM11 with smallest resistance was obtained.
- For simplicity, the hull surface of the 10000TEU twin-skeg was divided into four parts–bulb, forward part, outside and inside part of twin-skeg, and more than a hundred parameters, such as length of bulb, angle of entrance, distance and angle between skegs, were adopted for the establishment of the fully parametric model.
- Four important variables were selected, of which one variable is used for the control of bulb length (Coef_bulbLength) and three variables are used for modeling of the shape of design waterline (Coef_dwlFullnessFwd, Coef_dwlatFOS, dwlEntranceAngle), Table 3 lists the value ranges and primary influences of the selected design variables. Then the design space exploration was carried out by adopting a SOBOL algorithm with the wave-making resistance (1000 Cw) at 23.5 kn in design draft condition as the objective function. Fig.
- 0E-4, so the wave-making resistance is reduced by about 25% from the 200 runs. Based on the results of the exploration study, a sensitivity computation is carried out to analyze the effect of the design variables on wave-making resistance. Fig.
- 3%, and the distribution of pressure for variant PM11 is greatly improved by the optimization. In order to predict the resistance precisely, a model of variant PM11 of the same scale ratio with A000 was built in CSSRC, where the corresponding model tests at design draft of PM11 were carried out in the large towing tank.
- Considering the complexity of twin-skeg hull form, about 100 parameters were adopted to establish the parametric models, and the parametric model is very flexible for the generation of twin-skeg container vessel. The final optimized variant PM11 was obtained by the optimization based on parametric model and CFD simulations. In order to predict the resistance precisely, a model of variant PM11 of the same scale ratio with A000 was built in CSSRC, where the corresponding model tests at design draft of PM11 were carried out in the large towing tank.
대상 데이터
- The model of the original 10000TEU twin-skeg container vessel case A000, manufactured with the scale ratio of 53.799 by CSSRC, is shown in Fig. 1, and the principal particular is listed in Table 1. The experiment data related to resistance, wave field has been obtained from the large deep towing tank of CSSRC, the model test and calculation results are compared in detail.
이론/모형
- In this paper, the numerical method is based on domain decomposition, which means the whole fluid is divided into three parts according to flow characteristics: the first part employs nonlinear wave-making numeric methods (Larsson, 1997), the second part solves boundary integral equation, the last part adopts viscous numeric method to simulate the flow fluid of after body of ships (Flowtech, 2012).
- Explicit Algebraic Stress Model (EASM) is used in the viscous flow simulation; the control equations are discreted by the finite volume method. The convection part uses the ROE differential format, and the diffusion term uses central differential format; the descretized differential equations are solved in a fully coupled manner.
- The convection part uses the ROE differential format, and the diffusion term uses central differential format; the descretized differential equations are solved in a fully coupled manner. The ADI method is used to solve the linear equations (Flowtech, 2012).
- Due to geometry complex of the twin-skeg vessel, a specialized feature definition was made for the automatic generation of input files based on the parametric model. The SOBOL engine (Friendship Systems GmbH, 2012) which generates pseudorandom numbers based on a deterministic calculation was used to drive the optimization platform of parametric design and CFD simulations.
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