Langley Research Center Turbulence Modeling Resource

DNS: Periodic Hill

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The data on this page were provided by P. Balakumar.

This DNS case is for 2-D separating flow over periodic hills. The DNS was run using a compressible code, using a compact high order scheme. This is a similar case to that computed using LES with an incompressible code, documented on the page: LES: 2-D Periodic Hill; however this DNS is at a lower Reynolds number. These DNS results have been documented in the following publication:

• Balakumar, P., "DNS/LES Simulations of Separated Flows at High Reynolds Numbers," AIAA Paper 2015-2783, June 2015, https://doi.org/10.2514/6.2015-2783.

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

• Hill crests are separated by L_x = 9h
• Channel height L_y = 3.035h
• Reynolds number (based on U_b and h) = 2800
• Mach number is 0.2
• U_b is the bulk velocity at the crest of the first hill
• The flow is periodic in the streamwise direction
• Spanwise extent of the grid is 4.5h
• Separation is near x=0.233h and reattachment is near 5.50h

DNS data are provided below. These results are from a grid with resolution 801x351x513 (streamwise, normal, spanwise).

• README.txt
• Example instantaneous u,v,w, gzipped file uvw-instant.dat.gz (9.6 MB)
• Averaged flowfield quantities, gzipped file dns-avg.dat.gz (22.4 MB)
   
• Profiles of averaged velocity and turbulence quantities at specific x-stations, file profiles.dat
• Profiles of balance terms in tau11, tau22, tau33, tau13, and k equations at specific x-stations, file balance.dat
• Averaged wall pressure coefficients
• Averaged wall skin friction coefficients

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Last Updated: 11/05/2021