US-Egypt Cooperative Research: Experimental and Computational Investigation of Wall-Pressure Fluctuation in Shear Layers with Strong and Weak Feedback Effects

描述：该奖项支持东兰辛密歇根州立大学机械工程系Ahmed Naguib博士与埃及开罗艾因沙姆斯大学机械动力工程系Zakaria Ghoneim博士和Mostafa Abdelkhalek博士的联合研究项目。他们计划在由美国国家科学基金会奖CTS 011690资助的实验工作的协调下，开展关于计算调查的合作研究。研究的重点将集中在两个不同但相关的流动问题上，了解壁压场的时空特征及其产生的流源。第一个是与二维空腔上的不可压缩流动有关的。艾因沙姆斯大学的合作者最近使用随机涡旋方法(RVM)计算了这一流动。实验研究的目的是验证现有的空腔流动计算。RVM程序将适用于计算(第二种情况)轴对称后向台阶上的流场和相关的壁面压力。这些计算将与现有奖项下进行的实验工作相协调。预计将在这里汇编的时空数据库可以用来调查一系列其他流动问题。例如，基于壁压的主动流动控制低阶模型的开发，以及非平衡流动的湍流模型的测试。由此产生的数据集将被公布，并通过网络和基于会议的传播向更广泛的流体动力学研究人员社区中的感兴趣的各方提供。范围：该项目将通过在与实验条件相似的条件下从计算中产生时间分辨、空间流动和壁面压力信息来增强现有的NSF赠款。这项拟议的工作是互惠互利的，因为密歇根州立大学获得了在实验研究项目中添加计算组件的深度，艾因沙姆斯大学获得了进行实验调查的能力，补充了正在进行的计算工作。该项目将支持一名硕士研究生从艾因沙姆斯大学前往密歇根州立大学，为期三个月，在PI的监督下建造空腔流动装置和麦克风阵列传感器模块。该硬件稍后将用于在艾因沙姆斯大学的风洞设施中进行测量，在高海姆博士的监督下，并与PI协调。该项目由国际科学和工程办公室以及化学和运输系统司联合资助。

0242991NaguibDescription: This award supports a joint research project between Dr. Ahmed Naguib, Department of Mechanical Engineering, Michigan State University (MSU), East Lansing, and Dr. Zakaria Ghoneim and Dr. Mostafa Abdelkhalek, Department of Mechanical Power Engineering, Ain Shams University, Cairo, Egypt. They plan to conduct collaborative research on computational investigation coordinated with experimental work funded by NSF award CTS 011690. The investigation will focus on understanding the space-time character of the wall-pressure field and its generating flow sources on two different but related flow problems. The first of these is associated with the incompressible flow over a two-dimensional cavity. This flow has been computed recently by the Ain Shams University collaborators using Random Vortex Methods(RVM). The experimental investigation is aimed at verifying the existing computation of the cavity flow. The RVM code will be adapted to compute the flow field and associated wall pressure for the (second case) flow over an axi-symmetric backward-facing step. These computations will be coordinated with the experimental work conducted under the existing award. It is expected that the space-time databases to be compiled here could be used to investigate a host of other flow issues. Examples include the development of wall-pressure-based low-order models for active flow control, and testing of turbulence models for non-equilibrium flows. The resulting data sets will be published and made accessible to interested parties in the wider community of fluid dynamics researchers through web and conference-based dissemination. Scope: This project will enhance the existing NSF grant by the generation of time-resolved, spatial flow and wall-pressure information from the computations at conditions similar to those of the experiment. The proposed work is mutually beneficial as MSU gains the depth of adding a computational component to an experimental research project and Ain Shams University gains capability to conduct an experimental investigation complementing ongoing computational work. The project will support the travel of a masters degree student from Ain Shams University to MSU for three months to work under the supervision of the PI on constructing a cavity-flow setup and microphone-array sensor module. This hardware will later be used to conduct measurements in a wind tunnel facility at Ain Shams University under the supervision of Dr. Ghoneim and in coordination with the PI. This project is jointly funded by the Office of International Science and Engineering and the Division of Chemical and Transport Systems.