Collaborative Research: Fundamental Investigation of Turbulent Ablation

这项研究将有助于发展必要的基本理解，以确定湍流如何与侵蚀或烧蚀表面相互作用。具体地，例如，湍流边界层内的相干结构触发并驱动非均匀表面形貌的生长。反过来，不断变化的地形影响湍流内的相干结构。流动和固体结构之间的耦合可以在涉及热传递的等温或非等温条件下存在。学术成就：研究小组包括佛蒙特大学和新罕布什尔州大学的研究人员。研究的计算部分旨在开发一种通用算法来模拟加热条件下初始光滑表面的空间变化烧蚀。相应的实验将涉及获取详细的数据，以验证计算模型。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，实验计划将利用粒子图像测速仪来测量流动结构的细节，以及光学方法来捕捉表面形状的演变。等温和非等温条件都将被考虑。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应用中非常重要。其他应用包括桥桩周围砂或土壤的侵蚀和移动，以及海滩侵蚀。这项研究将涉及不同的本科生干部，而一个特殊的主题研究生课程将解决实验和计算的整合。

0967857 DubiefThis 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.