Study of Vortex Reconnection by means of Holographic particle Velocimetry

侯赛因的提议结合了对流体力学中一个基本过程的基础研究：--与i)碰撞环和ii)椭圆环有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：全息粒子测速仪。流体力学方面将对负责精细混合(在非预混燃烧中具有内在重要性等)的过程产生影响。湍流动能的耗散。为进一步发展HPV而提出的努力，将带来这一独特方法的重大进步，以获得流场的瞬时快照。提出者和他的同事在最初的开发工作中开创了先河，他显然非常适合追求这一进一步的能力。值得注意的是，提出者将在这一综合活动中结合在流体力学中具有公认重要性的研究路径，他一直是这一研究的主要先驱之一，即集中涡量场的演变。这种流动的并行(和独立资助的)数值模拟构成了研究贡献的一个非常重要的方面。这些计算中的潜在困难来自于与实验者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/确定可能成为每一种不同方法的特征的错误和限制具有重要意义。

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.