Lateral cavities play a significant role in many problems of interest in aerodynamics and hydrodynamics, including flow-induced vibrations and acoustics. In environmental flows they form recirculating regions, dominated by multiple turbulent coherent structures that interact with each other and with the boundaries. These flows have lower velocity magnitudes and control particle transport, nutrient uptake, and contaminant transport processes, but the complex local turbulence dynamics is highly 3D with multiple time and length scales. High-resolution numerical models that capture the coherent-structure dynamics can provide insights on the transport mechanisms and controlling factors of mass transport. In this work we study the physical processes produced by coherent-structures using large-eddy simulations (LES) coupled with transport equations. We implement a Lagrangian particle model to study residence times and perform statistical analysis of flow trajectories and Lagrangian coherent structures to understand the impacts at larger scales and implications on transport parameterizations.
About the Speaker
Cristián Escauriaza is Associate Professor of Hydraulic and Environmental Engineering at the Pontificia Universidad Católica de Chile. He received his PhD from the University of Minnesota and a MSc from the Georgia Institute of Technology. Cristián’s research focuses on environmental fluid mechanics and the study of complex turbulent flows in nature for a wide range of scales, and on the characterization of transport processes in engineering and earth sciences via numerical simulations, nonlinear dynamics, and statistical analyses. He is associate researcher of the Center for Integrated Disaster Risk Management (CIGIDEN), and scientific leader of the marine energy center MERIC.
Host: Leo Chamorro