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2018 Master's Degree Dissertation Defense has Successfully Concluded
Editor by：【admin】 On：【2018-1-13】
On January 13, 2018, five fresh master graduates of the reasearch group, Fu Wenwen, Xia Ke, Ai Yong, Rao Chengping and He Dongya attend Master's Degree Dissertation, holded at Room A1006, Mulan Shipbuilding Building, Shanghai Jiaotong University. The dissertation defense committee was composed of Prof. Zou Zaojian (Shanghai Jiaotong University), Prof. Wang Jinbao (Sino-Marine Industry No. 218 Research Institute), Prof. Zhu Renchuan (Shanghai Jiaotong University), Prof. Xiao Longfei (Shanghai Jiaotong University), and Prof. Fu Shixiao (Shanghai Jiaotong University). Prof. Chen Zuogang (Shanghai Jiaotong University), Prof. Wan Decheng (master tutor, Shanghai Jiaotong University), and Research Assistant Zou Xie (secretary of defense, Shanghai Jiaotong University).
The topic of Fu Bowen’s master’s degree thesis is “Numerical Study on Vortex-induced Vibration of Top Tensioning Standpipe Considering Platform Horizontal Movement”. His main work is to conduct numerical research on the vortex-induced vibration of the riser induced by platform-induced motion through computational fluid dynamics and computational structural dynamics methods. In his paper, the vortex-induced vibration of a flexible cylinder in an oscillating flow is first studied, and the numerical method is verified by comparing with an experiment.Then, the vortex-induced vibration of the riser, under the movement of the platform in one direction and two directions,is calculated,respectively. The experts put forward many valuable insights on the content of the paper, including the selection of turbulence models, the selection of slice numbers, the setting of initial tension, the meshing situation, the feasibility of real-scale simulation, and the platform-riser coupling solution.Also, the teachers proposed some amendments to the details of the content, including changing the names of some chapters to be more specific and enlarging some of the pictures.”Fu Baowen’s reply is clear and he can correctly answer the questions raised by the defense committee”, one of the professors concluded.
The subject of Xia Ke's master's degree thesis is "The analysis of hydrodynamic performance of floating platform under shallow water near islands and reefs based on CFD method and the study of wave evolution characteristics. The paper applys CFD method to explore the hydrodynamic performance of the near-island reefer floating platform, considering the effect of the inclined bottom terrain on the wave propagation;also it obtains the motion characteristics of the platform in shallow water waves, and analyzes and summarizes the fluctuation characteristics of wave height and wave frequency components. Then, the effects of different terrains on the evolution of waves are discussed and found the topographic factors lead to the strong non-linear phenomenon of wave propagation. Finally, the numerical simulation of the rolling problem of two-dimensional wave along the slopes is performed. And the parameter sensitivity of characteristic index and asymmetry of wave rolling are analyzed. Experts put forward many valuable opinions on the paper, including how to determine wave breaking, how to explain the wave evolution characteristics fluctuating periodically, and why it is necessary to arrange floating platforms in shallow water near the island reef in South China Sea.At the same time, the review teachers also proposed some amendments to the paper, such as the title of the paper's chapter should be more detailed, the contents should be more close. Xia Ke's paper is rich in research content, applys correct technical methods, and is full-fledged and credible. Also,the structure is complete .
Ai Yong's master's degree thesis title is "Study on Complex Wake Characteristics of Wind Farm Based on Actuation Line Model". His main task is to apply the actuating line model and computational fluid dynamics method to study the significant wake effects in the wind farm as well as the obvious wake mutual interference effects. The thesis first compares with the experiments and validates the numerical solution module of wind farm based on actuating line model. Then, the power output characteristics of the two-fan,arranged in two kinds of forms ,series and stagger arrangement ,in the wind farms, are studied. Finally, the complex wake effect and the typical wake mutual interference effect in large multi-fan wind farm based on Lilgrund wind farm layout are studied. The teachers made valuable comments on the content of the paper, and heated discussions were carried out on fan volume force solution, calculation domain partitioning, and grid convergence verification. Some amendments on the content and other details are also proposed, including English expression, layout of thesis, etc. “In his defense, Ai Yong’s preformance was great”, one professor said.
The title of Rao Chengping’s master’s degree thesis is “Study the slamming of solitary waves on elastic structures based on MPS-FEM coupling method”. His main task is to conduct numerical research on the issues of green water and bottom slamming on offshore structures. The paper first established a numerical pool based on the MPSFEM-SJTU solver independently developed by the research group and verified the accuracy of numerical wavemaking. Then, the paper simulates the green water and bottom slamming issues of the elastic structure, and studies the influence of deck freeboard, clearance and wave height on the slamming process, and also elaborates the structural elasticity impacts the slamming load distribution, load peak and the evolution of the free surface. The teachers made wonderful comments on the paper and gave valuable insights, including the selection of particle spacing in numerical simulation, the accuracy of wall slamming pressure calculation, and the advantages of the coupling method in the study of hydroelastic issues. Finally, Rao Chengping gave a clear answer to the questions answered by the experts. “This paper gave a good explanation of the mechanism of hydroelastic slamming”, Professor Fu Shixiao commented.
He Dongya’s master's degree thesis is titled "Numerical Study on Open-Water Performance of Hybrid CRP Turret Propeller". The large-scale shipbuilding and energy-saving and emission-reducing requirements have brought severe challenges to ship propulsion design. He Dongya, carried out a numerical simulation study on the hydrodynamic performance and energy-saving and emission-reduction effects of Hybrid CRP Turret Propellers. The paper conducted an in-depth study on the influence of the distance between the front and rear propellers, the number of blades, and the speed ratio. The conclusions have certain reference significance for the optimization design of the new thruster.Experts asked questions about the research methods and calculation results, and gave some suggestions regarding the structure of the paper. The Defence Committee agreed that the research content of the paper is rich, the technical methods are correct, and the results of the study are accurate and reliable. It is recommended that a master's degree should be awarded.
The five students had done solid research works during their Master's study.Their papers were rich in content, complete in structure, and their performances in their defense were excellent. Also they had published many academic papers.So all votes were unanimously approved by the defense committee that the five masters were recommended to be rewarded the master's degrees
Congratulations to Fu Bowen, Xia Ke, Ai Yong, Rao Chengping and He Dongda for their successful master's degree defense! For five students, this is not the end. This is just the beginning. The wonderful life has just begun to set off.
On the day of the defense, the team members under the leadership of Prof. Wan Decheng took an annual team photo. All the team members used the recent popular gestures of heart-to-heart. And the atmosphere of the team is harmony, warmth.Happy new year! Come on!
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