Langley Research Center Turbulence Modeling Resource

DNS: 2-D Turbulent Separation Bubbles

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The data on this page were provided by G. Coleman.
 

Suction and Blowing on Top Wall

This flow is a 2-D separation bubble, with the separation and reattachment forced by velocity transpiration (suction and blowing) along the top boundary. The oncoming boundary layer in the zero-pressure-gradient region has a Re_theta of around 2000. The flow was computed using the incompressible Navier-Stokes equations in a pseudo-spectral code. Additional details concerning the data, code, and computational methodology can be found in:

• Coleman, G. N., Rumsey, C. L., and Spalart, P. R., "Numerical Study of Turbulent Separation Bubbles with Varying Pressure Gradient and Reynolds Number," Journal of Fluid Mechanics, vol. 847, 2018, pp. 28-70, https://doi.org/10.1017/jfm.2018.257.

See also the related page: DNS: Swept Turbulent Separation Bubble.

Here is an explanation of what is in the data files provided:

• README_Cases_A_thru_C.v9 (updated 12/18/2023)

The DNS data files for the main case (Case C) from the abovementioned paper are given here:

• Qofx_CaseC_xavg.dat (surface data in Tecplot format, locally averaged in x)
• Qofxy_CaseC_xavg.dat.gz (field data in Tecplot format, locally averaged in x, gzipped 81.7 MB)
• btkeofxy_CaseC_TMR.dat.gz (TKE budget in Tecplot format, gzipped 60.9 MB)

DNS data at other conditions in the paper are given below:

• Qofx_CaseA_xavg.dat (Case A surface data in Tecplot format, locally averaged in x)
• Qofxy_CaseA_xavg.dat.gz (Case A field data in Tecplot format, locally averaged in x, gzipped 28.1 MB) (new 12/18/2023)
• Qofx_CaseB_xavg.dat (Case B surface data in Tecplot format, locally averaged in x)
• Qofxy_CaseB_xavg.dat.gz (Case B field data in Tecplot format, locally averaged in x, gzipped 34.7 MB) (new 12/18/2023)

Suction Only on Top Wall

This flow is very similar to the above, except that the top-wall velocity transpiration is suction only, so that the adverse pressure gradient is not followed by a favorable pressure gradient in this case. Additional details can be found in:

• Coleman, G. N., "Numerical Simulation of Pressure-induced Separation of Turbulent Flat-plate Boundary Layers: Definition and Overview of New Cases with Suction-only Transpiration and a Step in Reynolds Number," NASA/TM-20210020762, September 2021. (Errata posted 01/08/2022)

Here is an explanation of what is in the data files provided:

• README_Cases_D_and_E.v1

The DNS data files for the main case (Case E) are provided here:

• Qofx_CaseE.dat (surface data in Tecplot format, locally averaged in x)
• Qofxy_CaseE.dat.gz (field data in Tecplot format, locally averaged in x, gzipped 24.1 MB)

DNS data at other conditions in the paper are given below:

• Qofx_CaseD.dat (Case D surface data in Tecplot format, locally averaged in x)

Return to: Data from DNS - Intro Page

Recent significant updates:
12/18/2023 - added field data for cases A and B
01/08/2022 - updated NASA/TM-20210020762 (errata)
10/18/2021 - added suction-only cases
08/12/2020 - revised README file to v7 (gives more precise values for Vmax to impose top-wall transpiration profile)
02/19/2019 - added cases A and B
06/01/2018 - added results with average in x, renamed unaveraged files, updated README file

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Responsible NASA Official: Ethan Vogel
Page Curator: Clark Pederson
Last Updated: 12/18/2023