SUGGESTED WORK FOR 2012 AIAA SPECIAL SESSIONS

1st AIAA CFD High Lift Prediction Workshop

General Information

Researchers interested in participating in the HiLiftPW special sessions at the AIAA meeting in June 2012 (New Orleans) are asked to submit an abstract by the deadline (see home page). First, review previous Trap Wing results from HiLiftPW-1 in order to familiarize yourself with the strengths and weaknesses of state-of-the-art prediction methods for this configuration:

• SUMMARY PAPER AIAA-2011-939 from HiLiftPW-1 (pdf file, 1.6 MB)
• PRESENTATIONS from HiLiftPW-1
• PRESENTATIONS from ASM 2011
• Relevant PAPERS LIST since Jan 2011

(Data files of HiLiftPW-1 participant results can be downloaded from the HiLiftPW-1 Results page, if desired.)

Then, submit an abstract describing your proposed research on the Trap Wing configuration. Suggested additional research studies can include, but are not limited to:

• Transition specification and/or transition prediction (see Transition Information Page)
• Effects of tunnel walls (see 14x22-Foot Tunnel Wall Information Page and Forces, Moments, and Pressures Page)
• Hysteresis effects (see Forces, Moments, and Pressures Page)
• Effects of support brackets
• Focus on the wing tip region (how to correctly capture pressures there)
• Focus on side-of-body (SOB) region (effects of grid, numerics, turbulence modeling on SOB separation)
• Turbulence modeling
• Grid effects, especially near maximum lift
• New, unconventional, or useful numerical methodologies such as grid adaptation and high-order methods

All participants are expected to make comparisons with both:

• Off-Body Velocity Probe Data
• Forces, Moments, and Pressures

Many of the above-mentioned investigations have been done to some degree in previous research. Abstracts that explore new ground or make new insights will have a greater likelihood of acceptance. Accepted authors are expected to write a full-length AIAA paper and make a presentation at the 30th AIAA Applied Aerodynamics Conference, June 25-28, 2012 in New Orleans, LA.

Researchers may either make use of existing Trap Wing grids (see HiLiftPW-1 Grids Page), or create their own.

Data Forms for Submission

Data submission is strongly encouraged, but not mandatory. Please fill out and submit the following Tecplot-readable Data Submittal Forms:

• Data Form 1 - for forces and moments
• Data Form 2 - for surface pressure coefficients
• Data Form 3 - for off-body velocity data

One set of forms (1 plus 2 plus 3) covers one complete set of runs. If a participant runs more than one set of grids, more than one CFD code or methodology, or more than one turbulence model, then one set of forms would be submitted for each grouping.

Note that Data Form 2 requires that data be extracted along 7 specific cuts on the configuration. These correspond to locations for which experimental pressure tap data are available. See the text file:

ss-extraction.planes.deployed-config1.txt

Note that these 7 cuts represent considerably less data than was required previously for HiLiftPW1. (If you are interested, details about the additional cuts used previously for HiLiftPW1 can be found on the HiLiftPW1 Submittal Page).

Tecplot macro files for extracting surface CP data are given here:

ss-extractplanes-config1.mcr
ss-renamezones-config1.mcr

The macro files can be used as follows.

1. Load (into Tecplot) a data file containing the solid walls along with your CFD solution on the walls. Be sure that X, Y, and Z are in full scale inches.
2. These macros are for the half-plane geometry defined in the -Y direction; therefore if your geometry lies only in the +Y sector, you must first flip or mirror your data (e.g., using Data-CreateZone-Mirror-XZPlane).
3. If CP is not one of your solution variables, then use Tecplot to create it.
4. Then, run the macro (ss-extractplanes-config1.mcr) The macro will create 7 new zones of extracted data at all the cuts asked for.
5. Under Data-Delete-Zone, delete all original zones so that only the 7 newly created zones are left.
6. Run the renaming macro (ss-renamezones-config1.mcr) to rename the new zones appropriately.
7. These cuts can then be written out by the user to an ASCII file (use point format); write out the variables X, Y, Z, CP.
8. The zones from this file should then be relatively easy to include into the Data Form 2. If you can limit the extractions to occur only on the appropriate elements, then do so. But if the extraction process also extracts unneeded areas (e.g., if the extraction along slat50 also includes data on the main and flap), then do not worry... these areas will be ignored.

For Data Form 3, use the experimental velocity probe data files to extract CFD velocities at the same locations. In Tecplot, this can be done as follows:

1. Load your volume solution into Tecplot.
2. Your X, Y, and Z variables should be in model coordinates, inches, and should be labeled as X, Y, and Z. If not, use Tecplot to rename them.
3. If uoverVinf, voverVinf, woverVinf, and VeloverVinf are not among your solution variables, then use Tecplot to create them.
4. Load (add) the X, Y, Z locations from each of the experimental data files (e.g., from VelAlpha28Eta83AftFlapRun059.dat). These data are located on the page: Experimental Data: Velocity Probes).
5. Use Data - Interpolate - Linear to interpolate your solution onto the experimental data points.
6. Write these interpolated data to an ASCII file (use point format); write out the variables X, Y, Z, uoverVinf, voverVinf, woverVinf, VeloverVinf.

Submit all data files by email to: hiliftpw@gmail.com by June 12, 2012.

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Page Curator and NASA Official Responsible for Content
Li Wang  

Last Updated
February 15, 2012

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