U.S.-U.K. Cooperative Research: Analysis of Large-Scale Instabilities in Turbulent Shear Flows using a Viscoelastic Model

这个为期两年的奖项将支持美国亚利桑那州立大学的陈康平和剑桥大学的克里顿在流体力学方面的美英合作研究。他们提出用雷诺应力的粘弹性模型研究湍流射流和其他湍流剪切流中的大规模不稳定性。将特别注意弹性应力引起的失稳机制。此次合作是美国研究人员最近在粘弹性流体流动和共流剪切流界面不稳定性方面工作的延续。他为这次合作带来了粘弹性流体研究方面的经验以及渐近分析和数值模拟方面的专业知识。这位英国研究者在流体动力学研究方面的经验补充了这一点。该项目将推进对射流和其他湍流剪切流中大型结构的理论理解。

This two-year award will support U.S.-U.K. cooperative research in fluid mechanics between Kang Ping Chen of Arizona State University and D. G. Crighton of the University of Cambridge. They propose studies on large-scale instabilities in a turbulent jet and in other turbulent shear flows using viscoelastic modeling for Reynolds stresses. Particular attention will be paid to the instability mechanism due to elastic stresses. The collaboration is a continuation of the U.S. investigator's recent work on viscoelastic fluids flow and interfacial instabilities in co-current shear flows. He brings to this collaboration experience in viscoelastic fluids research and expertise in asymptotic analysis and numerical simulation. This is complemented by the British investigator's experience in fluid dynamics research. The project will advance theoretical understanding of large-scale structures in jets and other turbulent shear flows.