IMT Seminar - Gretar Tryggvason AbstractDirect numerical simulations of multiphase flows, where all continuum spatial and temporal scale are fully resolved for a large system undergoing unsteady motion, have advanced significantly over the last two decades or so. Such simulations have been used to examine a large number of multiphase systems and have resulted in a significantly improved understanding of their dynamics. The challenges now are twofold: How to use the results to increase our ability to predict industrial scale flows and how to conduct direct numerical simulations of much more complex systems. We first describe recent efforts to simulate three phase flows, including bubbles and suspended particles, where the main challenge is how to include a moving contact line. Froth flotation used in mineral processing, where air bubbles are used to separate hydrophobic from hydrophilic particles, is the classic example. Currently, most efforts to use the results of fully resolved simulations to improve coarse models for industrial scale flows relay on ideas going back several decades, but progress in data science is changing that. For predictions, we need coarse models that describe the dynamics of the large-scale flow and in many cases the presence of a sharp phase boundary is the most important feature of the flow. We discuss formal ways to coarsen results from fully resolved simulations while preserving a sharp, but simplified phase boundary as well as efforts to predict the evolution of the coarse flow using machine learning combined with trajectory modeling, where the conservation equations are augmented in such a way that the coarse flow evolves correctly. SpeakerGretar Tryggvason is the Charles A. Miller, Jr. Distinguished Professor at the Johns Hopkins University and the head of the Department of Mechanical Engineering. He received his PhD from Brown University in 1985 and was on the faculty of the University of Michigan in Ann Arbor until 2000, when he moved to Worcester Polytechnic Institute as the head of the Department of Mechanical Engineering. Between 2010 and 2017 he was the Viola D. Hank professor at the University of Notre Dame and the chair of the Department of Aerospace and Mechanical Engineering. Professor Tryggvason is well known for his contributions to computational fluid dynamics; particularly the development of methods for computations of multiphase flows and for pioneering direct numerical simulations of such flows. His various service activities include serving as the editor-in-chief of the Journal of Computational Physics 2002-2015 and currently as the Chair Elect of the Division of Fluid Dynamics of the American Physical Society. He is a fellow of APS, ASME and AAAS, and the recipient of several awards, including the 2012 ASME Fluids Engineering Award and the 2019 ASTFE Award. Further InformationProf Gretar Tryggvason profile, Johns Hopkins University Tags Multiscale Thermofluids Feb 10 2025 14.00 - Feb 17 2025 15.00 IMT Seminar - Gretar Tryggvason We have the pleasure to host Prof. Gretar Tryggvason. The title of the talk is "Numerical Simulations of Complex Multiphase Flows" Classroom 10, Alrick Building, King's Buildings, University of Edinburgh
IMT Seminar - Gretar Tryggvason AbstractDirect numerical simulations of multiphase flows, where all continuum spatial and temporal scale are fully resolved for a large system undergoing unsteady motion, have advanced significantly over the last two decades or so. Such simulations have been used to examine a large number of multiphase systems and have resulted in a significantly improved understanding of their dynamics. The challenges now are twofold: How to use the results to increase our ability to predict industrial scale flows and how to conduct direct numerical simulations of much more complex systems. We first describe recent efforts to simulate three phase flows, including bubbles and suspended particles, where the main challenge is how to include a moving contact line. Froth flotation used in mineral processing, where air bubbles are used to separate hydrophobic from hydrophilic particles, is the classic example. Currently, most efforts to use the results of fully resolved simulations to improve coarse models for industrial scale flows relay on ideas going back several decades, but progress in data science is changing that. For predictions, we need coarse models that describe the dynamics of the large-scale flow and in many cases the presence of a sharp phase boundary is the most important feature of the flow. We discuss formal ways to coarsen results from fully resolved simulations while preserving a sharp, but simplified phase boundary as well as efforts to predict the evolution of the coarse flow using machine learning combined with trajectory modeling, where the conservation equations are augmented in such a way that the coarse flow evolves correctly. SpeakerGretar Tryggvason is the Charles A. Miller, Jr. Distinguished Professor at the Johns Hopkins University and the head of the Department of Mechanical Engineering. He received his PhD from Brown University in 1985 and was on the faculty of the University of Michigan in Ann Arbor until 2000, when he moved to Worcester Polytechnic Institute as the head of the Department of Mechanical Engineering. Between 2010 and 2017 he was the Viola D. Hank professor at the University of Notre Dame and the chair of the Department of Aerospace and Mechanical Engineering. Professor Tryggvason is well known for his contributions to computational fluid dynamics; particularly the development of methods for computations of multiphase flows and for pioneering direct numerical simulations of such flows. His various service activities include serving as the editor-in-chief of the Journal of Computational Physics 2002-2015 and currently as the Chair Elect of the Division of Fluid Dynamics of the American Physical Society. He is a fellow of APS, ASME and AAAS, and the recipient of several awards, including the 2012 ASME Fluids Engineering Award and the 2019 ASTFE Award. Further InformationProf Gretar Tryggvason profile, Johns Hopkins University Tags Multiscale Thermofluids Feb 10 2025 14.00 - Feb 17 2025 15.00 IMT Seminar - Gretar Tryggvason We have the pleasure to host Prof. Gretar Tryggvason. The title of the talk is "Numerical Simulations of Complex Multiphase Flows" Classroom 10, Alrick Building, King's Buildings, University of Edinburgh
Feb 10 2025 14.00 - Feb 17 2025 15.00 IMT Seminar - Gretar Tryggvason We have the pleasure to host Prof. Gretar Tryggvason. The title of the talk is "Numerical Simulations of Complex Multiphase Flows"
