Langley Research Center Turbulence Modeling Resource

LES: Compressible 2-D NASA Wall-Mounted Hump

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The data on this page were provided by A. Uzun of NIA.

This compressible LES case is for 2-D separating flow over the NASA Wall-Mounted Hump (no flow control). The link to the experimental data can be found by clicking here: NASA CFDVAL2004 Workshop webpage. The LES was run using a compressible code. The publication is:

• Uzun, A. and Malik, M. R., "Wall-Resolved Large-Eddy Simulation of Flow Separation Over NASA Wall-Mounted Hump," AIAA Paper 2017-0538, January 2017, https://doi.org/10.2514/6.2017-0538.
• Uzun, A. and Malik, M. R., "Large-Eddy Simulation of Flow over a Wall-Mounted Hump with Separation and Reattachment," AIAA Journal, Vol. 56, No. 2, February 2018, pp. 715-730, https://doi.org/10.2514/1.J056397.

This is a wall-resolved compressible-flow LES computation at M=0.1. Several different variants were run. Here, 3 variants are reported. Some relevant information is given here, but the interested reader is referred to the above paper for more details. For all runs:

• M=0.1
• Reynolds number (based on U_in and c) = 936,000, where U_in is the freestream velocity and c is the hump chord.
• To reduce the grid requirements, an overset grid was used whose overlap region occurred within the boundary layer.

• Incoming Re_theta=5000 with span=0.2c and "original" top wall shape, Vreman SGS model
• Incoming Re_theta=6500 with span=0.4c and "original" top wall shape, Implicit LES
• Incoming Re_theta=6500 with span=0.4c and "modified" top wall shape, Implicit LES

The "modified" top wall shape was attempted because it was felt that the original shape (intended to mimic the blockage effect of the end plates in the experimental configuration) may not have included the influence of the boundary layers. The shape was increased arbitrarily by 50% to attempt to account for the possible additional flow blockage. Long-time averaged LES data are provided below (on a grid normalized by the hump chord). Details regarding the NASA wall-mounted hump geometry can be found at: Separated Flow over Wall-mounted Hump with and without Flow Control.

The following figure is from the Re_theta=5000 case:

The field data below contains LES time-averaged results, including mean flow variables density, u-velocity, v-velocity, and pressure; and turbulence quantities uu, vv, ww, and uv.

Nondimensional mean flow and turbulence mean field data is provided here (note that this is a gzipped Tecplot formatted file, so you must either have Tecplot or know how to read their format in order to use it. See README.tecplot):

• WallHump-Retheta5000.dat.gz (26.4 Mb)
• WallHump-WideSpan-OriginalTopWallContour.dat.gz (55.9 Mb)
• WallHump-WideSpan-ModifiedTopWallContour.dat.gz (55.8 Mb)

Nondimensional velocity derivatives are provided here (note that this is a gzipped Tecplot formatted file, so you must either have Tecplot or know how to read their format in order to use it. See README.velderivs.tecplot):

• WallHump-Retheta5000-VelocityDerivatives.dat.gz (17.1 Mb)
• WallHump-WideSpan-OriginalTopWallContour-VelocityDerivatives.dat.gz (36.2 Mb)
• WallHump-WideSpan-ModifiedTopWallContour-VelocityDerivatives.dat.gz (36.2 Mb)

Surface pressure coefficients:

• WallHump-Cp-Retheta5000.dat
• WallHump-WideSpan-Cp-OriginalTopWallContour.dat
• WallHump-WideSpan-Cp-ModifiedTopWallContour.dat

Surface skin friction coefficients:

• WallHump-Cf-Retheta5000.dat
• WallHump-WideSpan-Cf-OriginalTopWallContour.dat
• WallHump-WideSpan-Cf-ModifiedTopWallContour.dat

Return to: Data from LES - Intro Page

Recent significant updates:
04/03/2017 - added velocity derivative data

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Responsible NASA Official: Ethan Vogel
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Last Updated: 11/05/2021