Direct Numerical Simulations of an Unpremixed Turbulent Jet Flame.
Annual technical rept. 16 Feb 86-16 Feb 87,
FLOW RESEARCH CO KENT WA APPLIED MECHANICS DIV
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A hybrid spectral-finite element computer code has been developed for direct numerical simulations of spatially developing three-dimensional turbulent flows under the influence of finite-rate chemical reactions. The spectral element method combines the generality of the finite element methods with the accuracy of the spectral techniques, which permits accurate simulations of flows with realistic boundary conditions. The finite elements are located in the direction of spatial development of the flow, and each element is composed of discrete Chebyshev collocation points. Pseudospectral methods using Fourier transforms have been in the other two directions of the flow. The code has been constructed in a manner that allows the number of data buffering operations to be easily optimized for the memory capabilities of the computer. The algorithm has been tested by comparing the numerical results to some known analytical results. Large-scale simulations are the subject of the present research.
- Numerical Mathematics
- Fluid Mechanics
- Combustion and Ignition