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On the Study of Autonomous Underwater Vehicles by computational fluid-dynamics

Open Journal of fluid dynamics 2020年第1期10卷 63-81页

作者： Joao Victor Nunes de Sousa Antonio Gilson Barbosa de Lima Francisco Alves Batista Edna Cordeiro de Souza Daniel Cesar de Macedo Cavalcante Paulo de Morais Pessoa Joao Evangelista Franco do Carmo Department of Mechanical Engineering Federal University of Campina GrandeCampina GrandeBrazil Department of Physics State University of ParaibaCampina GrandeBrazil Department of Physics and Mathematical Federal University of Campina GrandeCampina GrandeBrazil Federal Institute of Education Science and Technology of the Sertao PernambucanoSerra TalhadaBrazil

Autonomous Underwater Vehicles (AUV’s) are considered as advanced classes of vehicles, capable of performing pre-established missions without physical communication with the ground or human assistance. The research and development of this type of vehicles have been motivated, due to its excellent characteristics, ideal to the military, scientific and industrial sectors. Thus, the objective of this paper is to study fluid flow behavior past over AUV’s, without and with control surfaces (rudders), by computational fluid-dynamics (CFD), aiming to obtain information about the impact of the operating depth and control surfaces on the vehicle's hydrodynamics, in order to help researchers and designers of this class of vehicles. Results of the drag coefficient, pressure, velocity and streamlines distribution around the vehicles are presented and analyzed.

关键词： Autonomous Underwater Vehicle fluid Flow computational fluid-dynamics Drag Coefficient

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Prediction of Distillation Column Performance by computational Mass Transfer Method

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Chinese Journal of Chemical Engineering 2011年第5期19卷 833-844页

作者：孙志民刘春江余国琮袁希钢 State Key Laboratory for Chemical Engineering (Tianjin University) and School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A computational mass transfer model is proposed for predicting the concentration profile and Murphree efficiency of sieve tray distillation column. The proposed model is based on using modified c＇2 -εc＇ two equations formulation for closing the differential turbulent mass transfer equation with improvement by considering the vapor injected from the sieve hole to be three dimensional. The predicted concentration distributions by using proposed model were checked by experimental work conducted on a sieve tray simulator of 1.2 meters in diameter for desorbing the dissolved oxygen in the feed water by blowing air. The model predictions were confirmed by the experimental measurement. The validation of the proposed model was further tested by comparing the simulated result with the performance of an industrial scale sieve tray distillation column reported by Kunesh et al. for the stripping of toluene from its water solution. The predicted outlet concentration of each tray and the Murphree tray efficiencies under different operating conditions were in agreement with the published data. The simulated turbulent mass transfer diffusivity on each tray was within the range of the experimental result in the same sieve column reported by Cai et al. In addition, the prediction of the influence of sieve tray structure on the tray efficiency by using the proposed model was demonstrated.

关键词： simulation concentration field computational mass transfer computational fluid-dynamics tray efficiency sieve tray turbulent mass transfer diffusivity

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