报告题目：Fully nonlinear potential flow model for aircraft ditching applications
报告人： Dr. Alessandro Del Buono
报告时间：2022年10月7日（周五）上午09:00-12:00、下午14:00-17:00 （北京时间）
地点：腾讯会议472-701-023
主办单位：飞行器先进设计技术国防重点学科实验室、国际交流合作处、校科协、航空学院
报告摘要：
The aircraft ditching, despite being a rare event, has to be considered in the design phase in order to match the certification requirements as well as to allow a safe evacuation of the aircraft. As an alternative to expensive full-scale experiments, computational approaches able to provide a reasonably accurate description of the hydrodynamics and of the fluid-structure interaction taking place during the aircraft ditching are of primary interest. Besides high-fidelity solvers, fast and efficient solvers, albeit approximate, are strongly needed by aircraft manufacturers in order to analyze different design configurations and to find the optimal solution.
Here a fully non-linear potential flow model for the descriptions of the hydrodynamics of the water entry and the combined water entry/exit of rigid bodies is proposed. The model is formulated in terms of boundary integral representation of the velocity potential and numerically solved through a Boundary Element Method coupled with a simplified Finite Element Method used for the description of the solution in the thin jet region. A new flow separation model, based on a kinematic criterion, has been developed and merged in the hybrid BEM-FEM approach for describing the flow separation from bodies with smoothly curved surface. The numerical model has been further extended by introducing suitable strategies aimed at improving the stability of the numerical solution in the exit phase. One involves the jet cutting, whereas a second one is based on a more intense use of the numerical filter used to overcome the saw-tooth instability of the BEM solution. Finally, as a first step towards the development of a 2D+t procedure, a multi-section procedure exploiting the 2D hybrid BEM-FEM solver to describe the solution in the single cross-section, has been developed for providing an approximated solution of the vertical water entry of a 3D fuselage.
报告人简介：AlessandroDelBuono has received the Master degree in Aeronautical Engineering at Roma Tre University in October 2017.He applied for a PhD position in Mechanical and Industrial Engineering at Roma Tre University. He has completed the Doctoral degree in April 2022 under the supervision of Prof. Giovanni Bernardini and Dr. Alessandro Iafrati. The main field of research has concerned the development of potential models with completely non-linear Boundary Element Methods for the study of ditching problem. Now he is working as a research fellow at CNR-INM Institute of Marine Engineering and is continuing working on the development of potential flow model for water impact applications.
