报告时间:2024年11月29日 9:30开始
报 告 人:袁海荣(华东师范大学 教授)
报告地点:9-104
报告题目:Hypersonic Limit for Steady Compressible Euler Flows Passing Straight Cones
报告摘要:We investigate the hypersonic limit for steady, uniform, and compressible polytropic gas passing a symmetric straight cone without attack angle. By considering Radon measure solutions on unit 2-sphere, we show that as the Mach number of the upstream flow tends to infinity, the measures associated with the weak entropy solution containing an attached conical shock ahead of the cone converge vaguely to the measures associated with a Radon measure solution to the conical hypersonic-limit flow. This justifies the high Mach number independence law and Newtonian sine-squared pressure law for cones in the hypersonic aerodynamics.
报告人简介:华东师范大学数学科学学院教授,博士生导师。袁海荣教授博士毕业于复旦大学,主要从事流体力学中的非线性问题的研究,在双曲型、椭圆型和双曲—椭圆复合型混合型偏微分方程(组)及其自由边界问题,可压缩欧拉方程组与跨音激波、高超音流等气体动力学现象的数学理论,弯曲空间中的流体力学问题,以及双曲守恒律方程的测度解理论等方面的研究中取得一系列系统成果。目前,已在 ARMA、Adv. Math.、SIAM J. Math. Anal.、CVPDE、JDE等国际数学期刊上发表学术论文多篇。