Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 Current 
 Affiliates 
 Visitors 
 Students 
 Research 
 ICAM-LANL 
 Publications 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Colloquia 
 Colloquia Archive 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 P/T Colloquia 
 Archive 
 Kac Lectures 
 Kac Fellows 
 Dist. Quant. Lecture 
 Ulam Scholar 
 Colloquia 
 
 Jobs 
 Postdocs 
 CNLS Fellowship Application 
 Students 
 Student Program 
 Visitors 
 Description 
 Past Visitors 
 Services 
 General 
 
 History of CNLS 
 
 Maps, Directions 
 CNLS Office 
 T-Division 
 LANL 
 
Tuesday, November 13, 2012
09:30 AM - 10:30 AM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

Multi-Scale Adaptive Modelling and Numerical Methods for Reactive Flows

Marc Charest
Postdoctoral associate at the University of Toronto Institute for Aerospace Studies

Turbulent combustion is a highly non-linear phenomenon that involves many competing physical processes such as chemical kinetics, turbulence, multi-phase transport and radiation which all take place over a wide range of spatial and temporal scales. Since small-scale physics directly impact larger-scale behaviour, accurate mathematical representations of turbulent flames are extremely difficult to obtain because all of the physical processes and scales must be properly captured. This hinders our ability to fully understand turbulent flames since there are no experimental and numerical techniques which can fully capture all of the governing processes. High-fidelity numerical methods and high-performance computing (HPC) are playing an increasingly more significant part in understanding turbulent combustion. But there is currently a limit on what can be simulated because of the complexities in the physics and the range of scales that must be resolved. Therefore, mathematical models of these complex devices must rely heavily on engineering approximations and sophisticated numerical methods to represent the underlying physics and ensure that computations remain tractable. Both adaptive mesh refinement (AMR) and high-order spatial discretizations are effective methods for providing accurate solutions with minimal computational resources. AMR automatically adapts the computational grid to the numerical solution in order to treat problems with disparate length scales using a reduced number of mesh points. High-order discretization techniques offer the potential to significantly reduce the computational costs necessary to obtain accurate predictions when compared to lower-order methods. However, efficient, universally-applicable, high-order discretizations remain somewhat illusive, especially for more arbitrary unstructured meshes and for incompressible/low-speed flows. New, efficient, highly-scalable solution algorithms are also required so that simulations of complex practical flames remain tractable. To obtain solutions to such problems, new algorithms are required that can fully take advantage of the growing trend towards exascale computing with large, multi-core, multi-threaded, heterogeneous architectures. A novel, parallel high-order finite-volume scheme and block-based AMR algorithm for large-eddy simulation (LES) of reacting flows on unstructured mesh will be discussed.

Host: Mikhail Shashkov, XCP-4 Methods and Algorithms, 667-4400