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4th AIAA CFD High Lift Prediction Workshop


3rd Geometry and Mesh Generation Workshop

Logo 1 for HLPW-4


NASA High Lift Common Research Model (CRM-HL):

Test Article Definition:

A general description of the CRM-HL can be found in AIAA Paper 2020-2771 (Lacy & Clark).

Specifically, the particular geometry definition provided here represents the NASA 10%-scale semispan CRM-HL test article, as tested in the QinetiQ wind tunnel in 2019 (AIAA Paper 2020-2770 (Evans et al.). Future CRM-HL wind tunnel models will be designed and built according to a reference configuration geometry specification, which is slightly different than the geometry used to design and build the NASA 10%-scale model.

The following geometry files for this configuration are provided in full-scale inches. The geometry files are provided in both IGES and STEP formats. There are three landing configurations included. The first is the nominal configuration, with inboard flap angle of 40 degrees and outboard flap angle of 37 degrees. The second and third configurations have modified flap settings: one at 37/34 degrees, and the other at 43/40 degrees. The Test Cases for HLPW-4 are posted on the Test Cases page.

The V2 geometry is different from V1 in the following way. Pinch-points (where a CAD face has a very cusp-like corner where two curves meet at nearly 0 degrees) were adjusted on the flap-bracket connections to the flap underside, and on the outer WUSS end-wall. The adjustment made the angle slightly more pronounced where the curves meet, and this corrected some very slight overlaps detected between these curves as they approached the corner. This fix helps avoid some grid generation issues and also helps to insure consistency among all grids (many grid generators were found to require adjustments in these regions).

If you encounter any problems/issues as you build grids using the V2 geometry, please make your own fixes, DOCUMENT everything done, and plan to share your fixes with the workshop committee. Note that the geometry includes regions that may be very difficult to grid (and possibly solve), including very thin gaps at the bottom/inside edge of the slats. These were present in the wind tunnel configuration, so they were left in. It is up to you how to handle such areas; this is part of the challenge of the workshop. Again, be sure to document every assumption/change/fix that you make, as your grids are created.

NOTE: STEP files only support SI units. For the purposes of this workshop, the subject model is in inches. The conversion based unit (#614316 in the file) should be used by a STEP reader to convert the model on import. In this case, units of CM were chosen with a conversion factor of 2.54 (again the STEP file includes this conversion constant). In the end, be sure to check that your final size agrees with the numbers below (e.g., full-scale wing semi-span should be 1156.75 inches).


Farfield Definition:

If possible, for consistency between grids, it is recommended that the following geometry definition for the freestream (farfield) boundary along with symmetry plane be used:

CRM-HL Boundary-Layer Tripping Information from QinetiQ Test:


Geometric Reference Parameters for the NASA CRM-HL (full scale inches):

If you are generating your own meshes for the CRM-HL configuration instead of using the provided baseline meshes, you should try to follow the gridding guidelines found on the Grids page, and the final grids must be made available to the HLPW Committee.


QinetiQ Wind Tunnel Geometry Files:

Note that the wind tunnel geometry has been scaled up to match the full scale CRM-HL geometry. I.e., the tunnel is being represented as 10 times its actual size. When the tunnel geometry is loaded together with the CRM-HL full scale geometry, the model is positioned appropriately in the tunnel test section, at zero degrees angle of incidence. Instructions for rotating to a different angle of incidence are included in the pdf file below. Note that using full scale CRM-HL geometry may require adjustments to the fluid properties in order to match Reynolds number; as with the free air cases, adjusting the kinematic viscosity is the preferred approach (see Q10/A10 on the FAQs page). An alternate approach would be to scale the entire geometry set by 0.10, and run with real air specifications.


Other Geometry Files:

Some of the TFGs are making use of other geometries beside CRM-HL as part of their research for HLPW-4. These include:

Please check periodically for updates, and/or get on the email distribution list by request to to be notified directly of any updates/changes.


Link to: Grids Page

Link to: Test Cases Page


Return to: High Lift Prediction Workshop Home Page


Recent significant updates:
12/18/2020 - Added QinetiQ Wind Tunnel geometry files and information
12/17/2020 - Added clarification regarding use of MAC as the length to nondimensionalize the pitching moment
11/18/2020 - Added link to NASA wall-mounted hump website
10/20/2020 - Added additional suggestions in red regarding problems/issues
10/13/2020 - Posted V2 geometry files and farfield/symmetry plane definition
09/25/2020 - Added tripping information from QinetiQ test
09/24/2020 - Added links to other geometry files
09/09/2020 - Updated note regarding STEP file details

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Responsible NASA Official: Christopher Rumsey
Page Curator: Christopher Rumsey
Last Updated: 01/13/2021