Abstract
A rendering system was constructed for three-dimensional visualization of a direct numerical simulation data base of two-dimen-sional turbulent channel flow. It was based on a method of approxi-mating complex contour surfaces with minute polygons. Instantaneous velocity and temperature fields were visualized. Quasi-coherent structures, such as low-speed streaks, vertical structures, ejec-tions and sweeps. were identified. It was found that the quasi-coherent vortex structures near the wall played a primary role in the production of instantaneous Reynolds shear stresses and turbu-lent heat fluxes.
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