Collaborative Research: Fundamental Investigation of Turbulent Ablation

这项研究将有助于发展对确定湍流如何与侵蚀或烧蚀表面相互作用所必需的基本理解。具体地说，湍流边界层内的相干结构触发和驱动了非均匀表面地形的增长。反过来，演变的地形影响湍流内的相干结构。流动与固体结构之间的耦合可以存在于包含换热的等温或非等温条件下。智力优势：研究团队包括佛蒙特州大学和新汉普郡大学的研究人员。这项研究的计算部分旨在开发一种通用算法来模拟初始光滑表面在加热条件下的空间变化烧蚀。相应的实验将包括获取详细的数据来验证计算模型。该模型将基于直接数值模拟方法，该方法能够预测流场的精细细节以及潜在的复杂表面形状演变。相应地，实验计划将利用例如粒子图像测速技术来测量流动结构的细节，以及利用光学方法来捕捉表面形状的演变。将同时考虑等温和非等温条件。更广泛的影响：湍流和表面侵蚀或烧蚀的耦合动力学在从高速飞行到潜在能量存储的各种应用中都是重要的。其他应用包括侵蚀和移动桥梁桩周围的沙子或土壤，以及海滩侵蚀。这项研究将涉及不同的本科生干部，而一门特别主题的研究生课程将讨论实验和计算的整合。

0967224WhiteThis research will aid development of the fundamental understanding necessary to determine how a turbulent flow interacts with an eroding or ablating surface. Specifically, the coherent structures within a turbulent boundary layer, for example, trigger and drive the growth of non-uniform surface topography. In turn, the evolving topography influences the coherent structures within the turbulent flow. The coupling between the flow and solid structures can exist under either isothermal or non-isothermal conditions involving heat transfer. Intellectual Merit: The research team includes investigators at the University of Vermont and the University of New Hampshire. The computational component of the research is aimed at developing a generalized algorithm to simulate the spatially-varying ablation of an initially-smooth surface under heated conditions. Corresponding experimentation will involve acquisition of detailed data to validate the computational model. The model will be based upon the direct numerical simulation methodology which is capable of predicting the fine detail of the flow field as well as the potentially complex surface shape evolution. Correspondingly, the experimental program will utilize, for example, particle image velocimetry to measure the detail of the flow structure, as well as optical methods to capture the surface shape evolution. Both isothermal and non-isothermal conditions will be considered.Broader Impacts: The coupled dynamics of turbulent flow and surface erosion or ablation is important in applications ranging from high speed flight to latent energy storage. Additional applications include erosion and movement of sand or soil around bridge pilings, and beach erosion. The research will involve a diverse cadre of undergraduate students while a special topics graduate course will address the integration of experiment and computation.