CFD软件在突扩、突缩流动现象可视化演示中的应用

Application of CFD Software in Visualization Demo of Sudden Enlargement, Sudden Contraction Flow Phenomena

突扩突缩流动是工程流体力学中的经典流动现象，也是工程流体力学中的重要课程内容，其内部流动复杂，伴随着局部阻力损失的增加，在传统授课过程中，该部分内容的讲解较为抽象，在课堂上缺乏形象的展示内容，借助CFD软件Fluent对突扩、突缩结构内的流动规律进行可视化研究，形象地展示内部流动规律，分析局部阻力产生原理，以改善该部分教学内容的效果，增强学生上课兴趣。

Sudden enlargement and sudden contraction flow is the the classic flowphenomenonof fluid mechanics,also an important course content of engineering fluid mechanics, it has complex internal flow, accompanied by increased local resistance losses. In the traditional teaching process,the portion of the content is more abstract, which lacksvisual content in the classroom, with the CFD software Fluent that made visualization studies on sudden expansion, flow regularitywithin the structure of sudden contraction flow, this paper vividly showed internal flow regularity, analyzed generation principle of local resistance, in order to improve the effect of the teaching, and enhance students＇ interests in school.