Langley Research Center Turbulence Modeling Resource

LES: 2-D Converging-Diverging Channel, Re=20580

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The data on this page were provided by Luiz Schiavo, William Wolf, and Joao Luiz Azevedo.

Compare this LES data with DNS data for the same configuration (at different Reynolds number): DNS: 2-D Converging-Diverging Channel, Re=12600.

This LES case is for 2-D separating flow over a converging-diverging channel with Re_tau of approximately 950, Re=20580 (based on inlet conditions). The LES was run using an incompressible code (MFLOPS3D), and has been documented in:

• Schiavo, L. A. C. A., Jesus, A. B., Azevedo, J. L. F., and Wolf, W. R., "Large Eddy Simulations of Convergent-Divergent Channel Flows at Moderate Reynolds Numbers," International Journal of Heat and Fluid Flow, Vol. 56, Dec. 2015, pp. 137-151, https://doi.org/10.1016/j.ijheatfluidflow.2015.07.006.
• De Jesus, A. B., Schiavo, L. A. C. A., Azevedo, J. L. F., and Laval, J.-P., "Further Studies of Adverse Pressure Gradient Effects in Turbulent Channel Flows," AIAA Paper 2015-2619, June 2015, https://doi.org/10.2514/6.2015-2619.

Some relevant information is given here, but the interested reader is referred to the above publications for more details:

• Hill crest is approx 2/3 units high, at location near x=5.21564
• Channel half-height = h = 1 unit (full channel height = 2h)
• Reynolds number = 20580 based on channel half-height (h), Umax at inlet, and kinematic viscosity (nu) at inlet
• The inlet channel flow is fully developed

Long-time averaged LES data are provided below. These results are from a grid with approximately 50.6 million grid points, covering a spanwise extent of Pi (3.14159...) with 256 cells in the spanwise direction. The Nx and Ny directions were discretized with 1024 and 193 grid points, respectively. Additional details about the LES grid and methodology can be found in the above references.

• statistics_description.pdf
• stats.cgns.gz, gzipped CGNS file (302 MB)

To read/write CGNS files, (free) software may be necessary if your pre/post-processing tools do not already handle it. See: CGNS Website for details.
 

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Last Updated: 11/05/2021