Plenary speakers for ICNMMF-5:
S. Balachandar, University of Florida
Title:
Physics-Inspired Machine Learning for Accurate Particle-Resolved-Like Closures of EL and EE simulations
Abstract:
Euler-Lagrange (EL) and Euler-Euler (EE) techniques have been widely employed for solving particle, droplet, and bubble-laden flows. Since flow around the individual particles is not resolved, the accuracy of the technique depends on the fidelity of the point-particle force laws used. The main focus of this talk is the use of emerging machine learning techniques along with physical insight into the averaging processes involved in the EL and EE techniques can yield closures that recover fully-resolved-like accuracy at orders of magnitude lower cost.
Bio:
S. “Bala” Balachandar got his undergraduate degree in Mechanical Engineering at the Indian Institute of Technology, Madras in 1983 and his MS and PhD in Applied Mathematics and Engineering at Brown University in 1985 and 1989. From 1990 to 2005 he was at the University of Illinois, Urbana-Champaign, in the Department of Theoretical and Applied Mechanics. From 2005 to 2011 he served as the Chairman of the Department of Mechanical and Aerospace Engineering at the University of Florida. Currently he is a distinguished professor at the University of Florida. He is the Newton C. Ebaugh Professor of Mechanical & Aerospace Engineering and the Director of College of Engineering Institute for Computational Engineering. Bala received the Francois Naftali Frenkiel Award from American Physical Society (APS) Division of Fluid Dynamics (DFD) in 1996 and the Arnold O. Beckman Award and the University Scholar Award from University of Illinois. He is Fellow of ASME and the American Physical Society Division of Fluid Dynamics. He was the recipient of ASME Freeman Fellowship Award (2017), Gad Hetsroni Senior Researcher Award from ICMF (2019), Outstanding Alumnus Award from the Indian Institute of Technology, Madras (2019), Outstanding Doctoral Mentoring Award from the University of Florida (2020), Thermal Fluids Engineering Award from the American Society of Thermal Fluids Engineers (2022), and University of Florida Research Foundation Professorship (2023). He is currently the co-editor-in-chief of the International Journal of Multiphase Flow and an associate editor of the Theoretical and Computational Fluid Dynamics.
______________________________________________________________________________________________
Luca Brandt, KTH
Title:
Diffuse-Interface Simulations of Heat and Mass Transfer in Turbulence
Abstract:
Heat and mass transfer occurs in several natural flows, as well as in many industries. This process is multiscale by nature: the chemistry at the interfaces affects the macroscopic system behavior (e.g. heat transfer coefficients) and the large-scale flow structures determine the details of the local mass and energy fluxes; as example, multicomponent droplet evaporation displays a complex interplay between density, concentration and temperature gradients. The talk will focus on recent advancements in modelling heat and mass transfer in laminar and turbulent flows, including interactions with smooth and patterned walls of different wettability. The formulation is based on the diffuse-interface Baer-Nunziato type of models, where the chemical potential disequilibrium drives the mass transfer in the system. In particular, we adopt a pressure-based formulation to remove time step restriction while keeping complex thermodynamics. Simulations of evaporation and boiling flows will be presented and the performance of diffuse-interface approaches for turbulent flows also discussed.
Bio:
Luca Brandt is professor in Fluid Mechanics at the Royal Institute of Technology (KTH), Stockholm, Sweden since 2012 and at the Department of Energy and Process Engineering, NTNU, Trondheim, Norway since 2021. He received a Masters in Mechanical Engineering from University of Rome, La Sapienza in 1997, and PhD in Fluid Mechanics at KTH in 2003. Before joining KTH as assistant professor he spent several months at Ecole Polytechnique, Palaiseau, France and at the University of Bologna, Italy. Luca’s research interests are in the general area of multiphase turbulence, particle laden flows, heat and mass transfer, low-Reynolds-number flows and complex fluids, hydrodynamic instabilities and flow control, with focus on the development of theoretical models and high-fidelity numerical simulations. He has more than 200 peer-reviewed journal papers including 1 Annual Review Fluid Mechanics in 2022. He was the recipient of an ERC consolidator grant to study particle suspensions in 2013 and of the “outstanding young researcher” award from the Swedish Research Council in 2014. He had been awarded the International Panetti Ferrari Prize and Golden Medal in the field of applied mechanics, Accademia dei Lincei, Turin, Italy, in 2022, the position as outstanding researcher in Mechanics by the Swedish Research Council in 2008 and the G. Gustafsson prize in 2005. Luca has served the community organizing several workshops and summer schools and is associated editor of the European Journal of Mechanics/B and of MECCANICA.
________________________________________________________________________________________________
Jesse Capecelatro, University of Michigan
Title:
Turbulence and Drag Modeling of Particle-Laden Compressible Flows
Abstract:
High-speed dispersed multiphase flows are present in numerous environmental and engineering applications, involving complex interactions between turbulence, shock waves, and particles. Compared to its incompressible counterpart, compressible two-phase flows introduce new scales of motion that challenge simulations and experiments. This talk will focus on recent advancements in modeling gas-particle flows under such extreme conditions. A new drag law will be presented that spans well subsonic to supersonic flows made up of dilute to dense concentrations of particles. In addition, highly-resolved simulations of shock-particle interactions will be presented that reveal unique turbulence transport mechanisms. A multiphase turbulence model is developed that shows promise for a wide class of high-speed two-phase flows.
Bio:
Jesse Capecelatro is an Associate Professor in the Departments of Mechanical Engineering and Aerospace Engineering at the University of Michigan. He received a Ph.D. from Cornell in 2014 followed by a postdoc at the University of Illinois Urbana-Champaign. He is a recipient of the NASA Early Stage Innovations Award, NSF CAREER Award, ONR Young Investigator Award, and the ASME Pi Tau Sigma Gold Medal Award. His research is broadly under the realm of fluid mechanics, with an emphasis on multiphase flow, turbulence, and scientific computing. Applications include fluidization, propulsion, disease transmission, and space exploration.
________________________________________________________________________________________________
Kimiaki Washino, Osaka University
Title:
Resolved and Unresolved CFD–DEM Coupling Simulation of Three-Phase Flows
Abstract:
Gas-liquid-solid three-phase flows can be encountered in many industrial processes such as wet granulation and slurry mixing. Despite a long history of research, our knowledge today about such flow is still limited due to the complex interactions between multiple phases, e.g., surface tension, drag force and particle surface wetting. Therefore, it is in increasing demand to develop reliable simulation models for better understanding and optimization of the processes. In this talk, the recent advancements of CFD–DEM coupling models for three-phase flows are discussed. Resolved and unresolved models have been developed to simulate flows from small (particle) scale to large (industrial) scale.
Bio:
Dr. Kimiaki Washino is a Senior Lecturer in the Department of Mechanical Engineering at Osaka University since 2018. He received his PhD from the University of Sheffield in 2011 and became a Knowledge Transfer Partnership (KTP) Associate between the University of Sheffield and Procter & Gamble. He moved to Osaka University as an Assistant Professor in 2013. He has been working on modelling and simulation of complex multiphase flows (especially gas-liquid-solid flows) using Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD). He is also a co-founder and CIO of DENSE Ltd. for consultation of multiphase flow simulations.
________________________________________________________________________________________________
Maike Baltussen, Eindhoven University of Technology
Title:
Mass Transfer from Bubbles
Abstract:
In many industrial processes, gas-liquid systems are used, which require the transfer of components from the gas phase to the liquid phase. Although the mass transfer from bubbles has been the topic of research in the past decades, the current state-of-the-art in the mass transfer correlations does not provide a single Sherwood number for a certain system, i.e. there is no consensus on the mass transferred from a bubble to the liquid. The Sherwood correlations obtained from experiments are generally obtained by a change in color or pH by reaction of the transferred component with another component in the reaction, which will change the mass transfer from the bubbles as the driving force is changed. To numerically obtain Sherwood numbers for industrial relevant cases is also difficult. The high Schmidt numbers and Reynolds numbers in the relevant cases result in very small boundary layers. Therefore, the numerically obtained Sherwood correlations are generally limited to low Schmidt and/or Reynolds numbers. In this talk, the main focus is on enabling the modelling of the mass transfer from bubbles with industrial relevant Schmidt (~103-105) and Reynolds numbers.
Bio:
Maike Baltussen is an Assistant Professor in the Department of Chemical Engineering and Chemistry at the Eindhoven University of Technology. She received her Ph.D. from Eindhoven University of Technology, the Netherlands in 2015. After a post-doctoral research fellowship at the University of Twente, she returned to Eindhoven University of Technology as Assistant Professor in 2016. Her current research focusses on the simulation of gas-liquid and gas-liquid flows using mainly Direct Numerical Simulation methods with a special attention towards the mass transfer in these multiphase flows.
________________________________________________________________________________________________
Zhaosheng Yu, Zhejiang University
Title:
Development of Two-Fluid Models for Particle-Laden Flows from Interface-Resolved Simulations
Abstract:
Particle-laden flows are ubiquitous in nature and industrial applications, and the two-fluid model (or Euler-Euler model) is widely used for the simulations of particle-laden flows of industrial scale. In this talk, I introduce our recent works on the development of two-fluid models based on interface-resolved direct numerical simulations using our fictitious domain method [1]. New drag correlations are developed based on our DNS data of particle sedimentation in a periodic domain and upward turbulent channel flows [2]. Correlations for the interfacial terms in the fluid Reynolds stress equations and the dissipation rate equation are established for particle-laden flows based on our DNS data of particle sedimentation in a periodic domain [3]. The results show that the Reynolds stress model with the proposed interfacial term correlations can quantitatively predict particle-induced turbulence enhancement or suppression in vertical channel flows. In addition, the drag correlations in the presence of particle clusters and the models for the lateral forces in turbulent channel flows will also be discussed.
[1] Yu, Z., Shao, X. A direct-forcing fictitious domain method for particulate flows. Journal of Computational Physics 2007, 227, 292-314.
[2] Xia, Y., Yu, Z., Pan, D., Lin, Z., & Guo, Y. Drag model from interface-resolved simulations of particle sedimentation in a periodic domain and vertical turbulent channel flows. Journal of Fluid Mechanics 2022, 944, A25.
[3] Xia, Y., Yu, Z., Lin, Z., & Guo, Y. Improved modelling of interfacial terms in the second-moment closure for particle-laden flows based on interface-resolved simulation data. Journal of Fluid Mechanics 2022, 952, A25.
Bio:
Zhaosheng Yu is currently a professor in the department of Mechanics at Zhejiang University. He received the B.S. and M.S. degrees from Zhejiang University, China, in 1996 and 1999, respectively, and the Ph.D. degree from the University of Sydney, Australia, in 2004. He was a Postdoctoral research fellow in the University of Twente, Netherlands, and then in IFP, France, from 2003 to 2006. He has been working at Zhejiang University since 2006, and was promoted to associate and full professor in 2006 and 2012, respectively. He serves as head of the Fluid Engineering Institute at Zhejiang University and head of the multiphase flow professional group in Chinese Society of Theoretical and Applied Mechanics. His current research interests include the mechanisms and modeling of the multiphase flows based on fully-resolved direct numerical simulations. He has published more than 100 peer-reviewed papers (including 18 JFM papers) with over 3000 Google scholar citations.
________________________________________________________________________________________________