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4th AIAA CFD High Lift Prediction Workshop

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Logo 1 for HLPW-4


Data Submittal Forms

The Tecplot-readable Data Submittal Forms are provided in the following tarred gzipped directory:

  1. Use a different directory for data sets that are fundamentally different from each other (different TFG, different code, different turbulence model, etc.). Name the directory logically. For example, change the directory name from XXX_Lastname_Code_Model_v4 to A-001_Michal_BCFD_SA_other-info-if-desired. Note that a given directory includes ALL test cases (Cases 1a, 1b, 2a, 2b, and 3), as many as you choose to participate in. Tar or zip up each directory of data to submit to the workshop.
  2. If you submit multiple sets of results to one TFG that logically belong in a different category and need to be evaluated independently (for example, using different codes, different turbulence models, etc.), then append ".1", ".2", ".3", etc. to your PID in order to distinguish between them. If your PID is A-001, you would use A-001.1, A-001.2, A-001.3, etc. for multiple distinct types of submission variants. For example:
    • A-001.1_Michal_BCFD_SA_nolimiter
    • A-001.2_Michal_BCFD_SA_limiter
    • A-001.3_Michal_BCFD_SST_steadystate
    • A-001.4_Michal_BCFD_SST_timeaccurate
    • A-001.5_Michal_FUN3D_SA_nolimiter
  3. If you submit data from different test cases at different times (using the same model, method, etc.), then send in the same directory, simply adding new files under it. In other words, re-send the old results in your directory even though we already have them. Assume that we will throw away your old directory and start reading everything from the new one. Be sure to fill out the file XXX_participant_info_v4.dat and provide the date of the latest submission.
  4. Each directory that you submit has a file called XXX_participant_info_v4.dat. Be sure to fill this out in each directory that you submit, since it provides details about your data, method, etc. for that directory.
  5. If you are submitting data to multiple TFGs, then be sure you use your assigned PID for that TFG. Let us know in the XXX_participant_info_v4.dat file if you are submitting the exact same data to more than one TFG.
  6. In all filenames, replace XXX with your assigned PID, e.g., G-011, R-048, A-002, H-013, L-025, W-047. Be sure to append ".1", ".2", ".3", etc. if you are submitting multiple sets to a given TFG. For example: XXX_case1a_flapdeflection_iterative_v4.dat -> H-013.2_case1a_flapdeflection_iterative_v4.dat
  7. Inside each data submittal file, replace all occurrences of XXX with your assigned PID. Be sure to append ".1", ".2", ".3", etc. if you are submitting multiple sets to a given TFG.
  8. Other than the XXX, please do not change the names of any zones inside the files.
  9. Some data files include DATASETAUXDATA lines. Please fill out as appropriate.
  10. Please include your surface streamline pictures under the subdirectory XXX_SurfaceStreamlinePictures. The preference is that you submit png format, if possible. If you are including any of the recommended "CFD views", name them cfdview_1.png, cfdview_2.png, cfdview_3.png, etc., corresponding to the views shown on If providing other views (e.g., to try to match wind tunnel oil flow photos), name them so that it is clear what they are, and include details in the README.txt file.
  11. Before tarring or zipping up your directory, remove any files that you are not using. For example, if you are not providing any data for Case 2b, then remove all files "XXX_case2b_CLmax*.dat" from the directory.


Postprocessing: Mean Surface Pressures and Skin Friction Extraction

The surface data are to be extracted in the (approximate) planes containing the pressure taps. Note that when deployed, the pressure tap rows are not aligned on all 3 elements (they are aligned only when stowed). See the figure below, showing the configuration with slat and flap elements deployed.
CRM-HL pressure tap rows

Note that the configuration is defined in the +Y plane, in full-scale inches. The following text file defines equations (Ax + By + Cz = D) for the planar cuts that approximately intersect the pressure taps for the 7 span stations on the main wing, slat, and flap when in deployed position: CuttingPlane_CRM-HL_v1.txt.

For those participants with access to Tecplot360 EX, macro files are provided here that can be used to help extract data on the surface of the full-scale configurations (inches) approximately along all of the requested pressure tap planes (v3 was posted 3/31/2021; it removed the lines "TransientOperationMode = AllSolutionTimes" which were problematic for some people):

Some editing of the macros may be required... see instructions inside the file. Note that these macros define each cutting plane by specifying 3 sets of X,Y,Z coordinates that lie in the plane, as defined by the equations in the above CuttingPlane_CRM-HL text file. Also, be aware that the Tecplot extraction will include ANY active surface cut by a specified plane, even if unintended.

Because the above macro extraction will include ANY active surface cut by a specified plane, even if unintended, an alternative set of macros is provided below. These macros separate out the slat, wing, and flap element extractions. They can be used in the following way in Tecplot: (1) Turn off all but the slat element(s) and use the slat_cutter macro to extract slices on the slat, (2) Turn off all but the wing element(s) and use the wing_cutter macro to extract slices on the wing, (3) Turn off all but the flap element(s) and use the flap_cutter macro to extract slices on the flap. Note that the slat and wing cutters are identical on all three configurations, except the zone name is changed.

Postprocessing: Velocity Profiles and Unsteady Surface Pressures at Specific Locations on the Wing

Velocity profiles and unsteady surface pressures are being requested at the same locations over the wing. The locations are identified in the figure below. These correspond to locations where unsteady pressure measurements may be made in future wind tunnel tests (on the model upper surface). For velocity, profiles should be extracted along z at the given specific x and y locations. For unsteady pressures (relevant only for time-accurate simulations), data should be extracted on the wing upper surface.
CRM-HL locations for velocity profiles and unsteady pressures

The locations are listed in the files: kulites_locations_final_40_37.dat, kulites_locations_final_37_34.dat, kulites_locations_final_43_40.dat. The only difference between the 3 files are the locations A.5, A.6, and B.4 (all located on the flap, which is rotated differently for the 3 configurations).

Participants are welcome to extract data at other locations, or over broader regions, if desired (the more we can learn about the flowfield from CFD, the better!)

Postprocessing: Surface Streamlines

A major set of desired inputs from the CFD are computed surface streamlines (particularly on the CRM-HL configuration's upper surface), for comparison with surface oil flow photos. This is particularly important for ascertaining the agreement/disagreement with regions of separation and other flow features of interest from the experiment. Below is an example surface streamline plot, showing typical areas of interest for HLPW-4. There are many methods available for obtaining postprocessed surface streamline patterns; at this time, participants are encouraged to make use of the best tools at their disposal.
Example surface streamline plot


For direct CFD comparisons with other CFD, some recommended views (including Tecplot nomenclature for orientation) are shown below, where the configuration is in full-scale inches. In Tecplot, the "use perspective" feature is not turned on for any views. The priority CFD views 1-4 are the simplest, taken looking directly down on the configuration (psi=theta=alpha=0). The best views for direct comparisons with wind tunnel oil flow photos are not known, and are currently up to each participant.


Example CFD view #1 Example CFD view #2
Example CFD view #3 Example CFD view #4
Example CFD view #5 Example CFD view #6
Example CFD view #7 Example CFD view #8
Example CFD view #9 Example CFD view #10


Return to: High Lift Prediction Workshop Home Page


Recent Significant Site Updates
04/09/2021 - Updated the data submittal forms and provided more detailed instructions
04/01/2021 - Minor change in sectional_cutter Tecplot macro files, including new separate versions for each wing element
03/17/2021 - Added request for surface streamline pictures as part of Data Submittal
02/02/2021 - V3 Data Form Templates posted, including information for velocity profiles and unsteady surface pressures
01/13/2021 - V2 Data Form Templates for Cases 1 and 2 posted, including pressure/skin friction forms; pressure tap cutting plane locations also posted
12/18/2020 - Initial Data Form Templates for Cases 1 and 2 posted
12/11/2020 - Clarifying change made in two of the Verification Study forms - data to be submitted on 3 finest grids

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Responsible NASA Official: Christopher Rumsey
Page Curator: Christopher Rumsey
Last Updated: 04/09/2021