Study of Vortex Reconnection by means of Holographic particle Velocimetry

fazle Hussain/University of houston Hussain的提案结合了流体动力学中一个基本过程的基础研究：与i)碰撞环和ii)椭圆环相关的涡量细丝场的粘性修正，以及一种先进测量技术的发展：全息粒子测速。流体力学方面将对过程产生影响，例如，细尺度混合（在非预混燃烧中具有内在重要性等）和湍流动能的耗散。所提出的努力，进一步发展HPV，将带来显著的进步，在这种独特的方法，以获得瞬时快照的流场。提议者和他的同事在最初的开发工作中是先锋，他显然非常适合追求这种进一步的能力。值得注意的是，申请人将在这项综合活动中结合流体动力学中公认的重要研究路径，并且他是主要先驱之一，即涡度集中场的演变。这种流动的并行（和独立资助的）数值模拟构成了调查贡献的一个非常重要的方面。这些计算的潜在困难来自于与实验家所面临的完全不同的属性。因此，以比较的方式使用这两组结果对于隔离/识别每种单独方法可能存在的错误和局限性具有重要意义。

CTS-9904328Fazle Hussain/University of HoustonThe Hussain proposal combines a fundamental investigation of a basic process in fluid dynamics: -- the viscous modification of the field of vorticity filaments associated with i) colliding rings and ii) an elliptical ring -- with the development of an advanced measurement technique: holographic particle velocimetry.The fluid mechanics aspects will have an impact on the processes which are responsible, for example, for fine scale mixing (of intrinsic importance in non-premixed combustion, etc.) and dissipation of turbulence kinetic energy. The proposed efforts, to further develop HPV, will bring a significant advancement in this unique method to gain an instantaneous snapshot of a flow field. The proposer and his colleagues have pioneered in the initial development efforts and he is distinctly well suited to pursue this further capability.It is noteworthy that the proposer will combine, in this integrated activity, research paths that are of recognized importance in Fluid Dynamics and for which he has been one of the principal pioneers, viz., the evolution of concentrated fields of vorticity.The parallel (and independently funded) numerical simulations of this flow constitute a very important aspect of the investigation's contribution. The potential difficulties in these computations derive from quite different attributes when compared with those faced by the experimentalists. Hence, using the two bodies of results in a comparative manner will be of significant importance in isolating/identifying errors and limitations that may characterize each of the separate approaches.