April 1, 1987
View Full PaperTurbulence statistics in fully developed channel flow at low Reynolds number
Key Points
- This research aims to analyze turbulence statistics in channel flow at low Reynolds numbers.
- Conducted direct numerical simulation of turbulent channel flow at Reynolds number 3300.
- Solved unsteady Navier-Stokes equations with approximately 4 million grid points.
- Computed and compared multiple turbulence statistics with existing experimental data.
- Reported new statistical correlations not previously documented.
- Found significant agreements and discrepancies with existing experimental data.
- Highlighted turbulence correlations behavior near the wall.
Abstract
A direct numerical simulation of a turbulent channel flow is performed. The unsteady Navier-Stokes equations are solved numerically at a Reynolds number of 3300, based on the mean centreline velocity and channel half-width, with about 4 × 10 6 grid points (192 × 129 × 160 in x, y, z ). All essential turbulence scales are resolved on the computational grid and no subgrid model is used. A large number of turbulence statistics are computed and compared with the existing experimental data at comparable Reynolds numbers. Agreements as well as discrepancies are discussed in detail. Particular attention is given to the behaviour of turbulence correlations near the wall. In addition, a number of statistical correlations which are complementary to the existing experimental data are reported for the first time.