Computational study of turbulent mixing at the Caltech ASC Center
Date
2003
Authors
Hill, D.
Mattner, T.
Pantano, C.
Cook, A.
Dimotakis, P.
Meiron, D.
Pullin, D.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
Proceedings of the 16th AIAA Computational Fluid Dynamics Conference, 23-26 June 2003 / 10p.
Statement of Responsibility
Conference Name
AIAA Computational Fluid Dynamics Conference (16th : 2003 : Orlando, Florida)
Abstract
We present an overview of a portion of the compressible turbulence program associated with the ASC-sponsored Center for Simulation of Dynamic Response in Materials. Progress in several areas will be summarized. The first is the development of a hybrid WENO-centered-finite-difference method suitable for the large-eddy simulation (LES) of the strong-shock, Richtmyer-Meshkov (RM) instability in a rectangular tube, with end-wall shock reflection and reshock of the evolving mixing layer. The use of this scheme together with a structure-based SGS model for LES of RM instability will be outlined. Second, results obtained from DNS simulations of nonpremixed turbulent combustion in a three-dimensional jet will be described. These were done with finite-rate chemistry using the four-step reduced mechanism of Peters. The emphasis is on diagnostics relating to statistical analysis of flame geometry and turbulent mixing across the range of scales. Lastly, we present results obtained from DNS of Rayleigh-Taylor instability. They elucidate the physics of the gravity-driven mixing through analysis of PDFs of mole fraction and scalar dissipation, and show the structure of the scalar-dissipation field, amplified through the incorporation and extensions of level-set analysis.