The Numerical Simulation of Compressible and Reactive Turbulent Structures
Computational research on the simulation of compressible and reactive turbulent structures in the Laboratory for Computational Physics and Fluid Dynamics requires the development of algorithms to exploit parallel and vector processing, the application of these techniques to simulate compressible, turbulent reactive flow structures, and the initiation of laboratory experiments to calibrate and complement the simulations.
Our algorithmic research includes the development of explicit and implicit monotone methods for compressible convection, techniques for coupling disparate timescales which do not involve inverting matrices, variable, adaptive and unstructured gridding in multidimensions suitable for turbulent flows, realistic models for inflow and outflow boundary conditions in bounded domain problems, and the use of triangular grids in two dimensions and tetrahedronal grids in three dimensions to adapt the solution automatically to evolving flow structures. This paper will review recent important contributions in each of these areas and will discuss the practical limits attainable by finite resolution detailed modeling techniques.
Our applications of these advances in simulation technology include research into the turbulent structure, propagation and extinction of detonations and flames using detailed chemistry models and multispecies diffusion coefficients, strong shock and transonic flows in complex geometries, and the study of turbulence and boundary layer phenomena in subsonic and supersonic shear layers and jets.
A brief review will be given using illustrative simulations from the Naval Research Laboratory Cray and the Graphical and Array Processing System (GAPS), a multitasking, low cost hardware and software system assembled to provide a parallel processing capability to perform and analyze turbulent reactive flow simulations interactively. The GAPS approaches Cray performance on spatially evolving, compressible transition-to-turbulence simulations.
KeywordsCombustion Vortex Convection Enthalpy Vorticity
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