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4th AIAA CFD High Lift Prediction Workshop

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Data Submittal Forms

The Tecplot-readable Data Submittal Forms are provided in the following tarred gzipped directory: Changes from V6: README.changes_from_previous_versions

  1. Each participant (or team) is to submit one DIRECTORY of data (tarred or zipped up), with all data included within that directory. Name the directory logically. For example, N. Ashton might change the directory name from "XXX_Lastname_Code_Model_v5" to "L-001_Ashton_Openfoam_SA_other-info-if-desired", where L-001 is N. Ashton's assigned PID. Note that the directory should include ALL test case data files (for Cases 1a, 1b, 2a, 2b, and 3), or as many as you choose to participate in. If you are part of a team (and are only going to submit one set of results as a team), then you should choose just one member's PID that your team will use.
  2. Be sure to fill out the file XXX_participant_info.dat located within the directory. This identifies you and your method, among other things.
  3. If you are submitting data to multiple TFGs, then use your assigned PID for that TFG. Let us know in the XXX_participant_info.dat file if you are submitting the exact same data to more than one TFG.
  4. In all filenames within the directory, replace XXX with your assigned PID, e.g., G-011, R-048, A-002, H-013, L-025, W-047. For example, XXX_case2b_CLmax_WT_FM.dat should be changed to R-048_case2b_CLmax_WT_FM.dat for participant R-048.
  5. Inside each data submittal file, replace ALL occurrences of XXX with your assigned PID. Other than the XXX, please do not change the names of any zones inside the files.
  6. Some data files include DATASETAUXDATA lines. Please fill out as appropriate.
  7. Please include your surface streamline pictures under the subdirectory XXX_SurfaceFlowVisualizations. The preference is that you submit png format, if possible. If you are including any of the recommended "CFD views", name them
    • XXX_aoaYYY_stream_cfdview_01.png
    • XXX_aoaYYY_stream_cfdview_02.png
    • XXX_aoaYYY_stream_cfdview_03.png
    • etc.
    corresponding to the views shown on Change the XXX in the filename to your PID and the YYY in the filename to the angle of attack; for example: "H-013_aoa7.05_stream_cfdview_01.png". If providing other non-CFD views (for example, 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 located under XXX_SurfaceFlowVisualizations.
  8. If you are also providing surface Cf contour pictures, put them in the same subdirectory (XXX_SurfaceFlowVisualizations). If you are including any of the recommended "CFD views" for Cf, name them
    • XXX_aoaYYY_cf_cfdview_01.png
    • XXX_aoaYYY_cf_cfdview_02.png
    • XXX_aoaYYY_cf_cfdview_03.png
    • etc.
  9. 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.
  10. If, after sending in your directory, you modify any data (for example, adding new results, including additional test cases, or updating results), then send in the same directory, WITH THE SAME DIRECTORY NAME, simply modifying files or adding new files under it. In other words, re-send the entire directory again, even though some of the results within it might be repeated. 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.dat and provide: (1) the date of the latest submission and (2) a list of things changed, added, or subtracted since the last submission.
  11. If you are going to submit multiple sets of results to one TFG that logically belong in different categories (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. EACH DISTINCT SUBMISSION SHOULD HAVE ITS OWN DIRECTORY OF DATA. For example, T. Michal might want to submit 5 directories of distinctly different results:
    • 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
    The corresponding PID (A-001.1, A-001.2, A-001.3, etc.) should be used within each directory.
  12. Submit your tarred or zipped directory to Christopher Rumsey as well as to your TFG leader. If the file is too large to email, then contact Christopher Rumsey to arrange for file transfer in another way.

Please do not re-organize the data structure provided in XXX_Lastname_Code_Model_v7.tar.gz. Your directory of results should maintain the original look and organization, i.e., no new or unexpected subdirectories or additional files added.


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. The macro files can be edited. For example, if you know for your grid that you want to turn off zones 1 and 5 when extracting on a particular element, it can be done with:
$!ActiveFieldMaps -= [1]
$!ActiveFieldMaps -= [5]

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 (provide enough z-height to include at least all the boundary layer and any upstream-element wakes... giving too much will not hurt). 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 and Skin Friction Coefficient (Cf) Contours

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.

Contours of surface skin friction coefficient are also very useful to plot (see second figure immediately below).
Example surface streamline plot Example surface skin friction coefficient plot

In the second figure, the Tecplot color map is provided as It is given by:
0.00 0
0.25 0
0.50 127
0.75 255
1.00 255

and the recommended range (shown in the figure) is 0 to 0.015 (banded). In the Cf plot, the "lighting" has been turned off; this reduces the 3-dimensional appearance of the objects, but it improves the interpretability of the colors. If everyone removes lighting and follows the color scheme and range detailed here, then the resulting CFD plots should be reasonably easy to compare directly with one another.

The Tecplot layout files for the above two pictures are provided here (minus the arrows and extra words): XXX_aoa7p05_stream_cfdview_01.lay and XXX_aoa7p05_cf_cfdview_01.lay. However, note that these files are most likely NOT directly applicable to most participants' surface grid or surface data; therefore they should be used for guidance only (also, different surface streamline seeding may yield better visualizations; this is an example only).

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 CFD views 1-4 are the simplest, taken looking directly down on the configuration (psi=theta=alpha=0); they should be relatively easy to approximately match, even if only trying to recreate the views using visual cues. The best views for direct comparisons with wind tunnel oil flow photos are not known, and are currently up to each participant.

NOTE: Ten views are shown. Please provide as many as you are able. Priority views are 1 through 5.

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

The Tecplot layout files for the above ten pictures are provided here: XXX_cfdview_01.lay, XXX_cfdview_02.lay, XXX_cfdview_03.lay, XXX_cfdview_04.lay, XXX_cfdview_05.lay, XXX_cfdview_06.lay, XXX_cfdview_07.lay, XXX_cfdview_08.lay, XXX_cfdview_09.lay, XXX_cfdview_10.lay. However, note that these files are most likely NOT directly applicable to most participants' surface grid or surface data; therefore they should be used for guidance only.

Note that all of the above assumes that your grid is in full-scale inches! If your grid is in different units, please be sure to translate to full-scale inches prior to submittal. For example, if your grid is in full-scale meters, then (if you are using Tecplot) execute: to translate it to full-scale inches prior to proceeding. The above Tecplot macros should then work, and the CFD views should be relevant.

Return to: High Lift Prediction Workshop Home Page


Recent Significant Site Updates
05/18/2021 - Updated the Tecplot-Readable Data Submittal Forms to v7
04/21/2021 - Preferred CFD views specified
04/13/2021 - 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: 05/25/2021