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博士之间的联合研究项目。他们计划在计算调查方面进行合作研究，并协调由美国国家科学基金会奖CTS 011690资助的实验工作。在两个不同但相关的流动问题上，研究重点是了解壁面压力场的时空特征及其产生流源。第一个问题与二维空腔上的不可压缩流动有关。最近，艾因沙姆斯大学的合作者使用随机涡旋方法（RVM）计算了这种流动。实验研究的目的是验证现有的空腔流动计算方法。RVM代码将用于计算（第二种情况下）轴对称后向台阶上的流场和相关的壁面压力。这些计算将与在现有合同下进行的实验工作相协调。期望在此编译的时空数据库可用于研究许多其他流问题。例子包括基于壁面压力的低阶主动流动控制模型的开发，以及非平衡流动的湍流模型的测试。结果数据集将通过网络和基于会议的传播发布，供更广泛的流体动力学研究人员社区中感兴趣的各方查阅。范围：本项目将通过在与实验相似的条件下计算产生时间分辨、空间流动和壁压信息来增强现有的NSF资助。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，而艾因沙姆斯大学获得了进行实验调查的能力，以补充正在进行的计算工作。该项目将资助一名艾因沙姆斯大学的硕士研究生前往密歇根州立大学，在PI的监督下进行为期三个月的旅行，以构建一个腔流装置和麦克风阵列传感器模块。该硬件随后将在高尼姆博士的监督下，与PI合作，在艾因沙姆斯大学的风洞设施中进行测量。该项目由国际科学与工程办公室和化学与运输系统司共同资助。

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.