Effect of Turbulence Models on Two Massively-Separated ...mln/ltrs-pdfs/NASA-2003-tm212412.pdfNASA...

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May 2003 NASA/TM-2003-212412 Effect of Turbulence Models on Two Massively-Separated Benchmark Flow Cases Christopher L. Rumsey Langley Research Center, Hampton, Virginia

Transcript of Effect of Turbulence Models on Two Massively-Separated ...mln/ltrs-pdfs/NASA-2003-tm212412.pdfNASA...

Page 1: Effect of Turbulence Models on Two Massively-Separated ...mln/ltrs-pdfs/NASA-2003-tm212412.pdfNASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS)

May 2003

NASA/TM-2003-212412

Effect of Turbulence Models on TwoMassively-Separated Benchmark Flow Cases

Christopher L. RumseyLangley Research Center, Hampton, Virginia

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Since its founding, NASA has been dedicated to theadvancement of aeronautics and space science. TheNASA Scientific and Technical Information (STI)Program Office plays a key part in helping NASAmaintain this important role.

The NASA STI Program Office is operated byLangley Research Center, the lead center for NASA’sscientific and technical information. The NASA STIProgram Office provides access to the NASA STIDatabase, the largest collection of aeronautical andspace science STI in the world. The Program Office isalso NASA’s institutional mechanism fordisseminating the results of its research anddevelopment activities. These results are published byNASA in the NASA STI Report Series, whichincludes the following report types:

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• Access the NASA STI Program Home Page athttp://www.sti.nasa.gov

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National Aeronautics andSpace Administration

Langley Research Center Hampton, Virginia 23681-2199

May 2003

NASA/TM-2003-212412

Effect of Turbulence Models on TwoMassively-Separated Benchmark Flow Cases

Christopher L. RumseyLangley Research Center, Hampton, Virginia

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Available from:

NASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS)7121 Standard Drive 5285 Port Royal RoadHanover, MD 21076-1320 Springfield, VA 22161-2171(301) 621-0390 (703) 605-6000

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Page 15: Effect of Turbulence Models on Two Massively-Separated ...mln/ltrs-pdfs/NASA-2003-tm212412.pdfNASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS)

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Page 16: Effect of Turbulence Models on Two Massively-Separated ...mln/ltrs-pdfs/NASA-2003-tm212412.pdfNASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS)

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REPORT DOCUMENTATION PAGE Form ApprovedOMB No. 0704-0188

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing datasources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any otheraspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations andReports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188),Washington, DC 20503.

1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE

May 20033. REPORT TYPE AND DATES COVERED

Technical Memorandum

4. TITLE AND SUBTITLE

Effect of Turbulence Models on Two Massively-Separated BenchmarkFlow Cases

5. FUNDING NUMBERS

762-20-11-06

6. AUTHOR(S)

Christopher L. Rumsey

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

NASA Langley Research CenterHampton, VA 23681-2199

8. PERFORMING ORGANIZATIONREPORT NUMBER

L-18284

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)

National Aeronautics and Space AdministrationWashington, DC 20546-0001

10. SPONSORING/MONITORINGAGENCY REPORT NUMBER

NASA/TM-2003-212412

11. SUPPLEMENTARY NOTES

12a. DISTRIBUTION/AVAILABILITY STATEMENT

Unclassified-UnlimitedSubject Category 02 Distribution: NonstandardAvailability: NASA CASI (301) 621-0390

12b. DISTRIBUTION CODE

13. ABSTRACT (Maximum 200 words)

Two massively-separated flow cases (the 2-D hill and the 3-D Ahmed body) were computed with severaldifferent turbulence models in the Reynolds-averaged Navier-Stokes code CFL3D as part of participation in aturbulence modeling workshop held in Poitiers, France in October, 2002. Overall, results were disappointing,but were consistent with results from other RANS codes and other turbulence models at the workshop.For the 2-D hill case, those turbulence models that predicted separation location accurately ended up yielding atoo-long separation extent downstream. The one model that predicted a shorter separation extent in betteragreement with LES data did so only by coincidence: its prediction of earlier reattachment was due to a too-lateprediction of the separation location. For the Ahmed body, two slant angles were computed, and CFD performedfairly well for one of the cases (the larger slant angle). Both turbulence models tested in this case were verysimilar to each other. For the smaller slant angle, CFD predicted massive separation, whereas the experimentshowed reattachment about half-way down the center of the face. These test cases serve as reminders that state-of-the-art CFD is currently not a reliable predictor of massively-separated flow physics, and that furthervalidation studies in this area would be beneficial.

14. SUBJECT TERMS

Separated flow; Turbulence model; Hill; Ahmed body15. NUMBER OF PAGES

52 16. PRICE CODE

17. SECURITY CLASSIFICATION

OF REPORT

Unclassified

18. SECURITY CLASSIFICATIONOF THIS PAGE

Unclassified

19. SECURITY CLASSIFICATION OF ABSTRACT

Unclassified

20. LIMITATION OF ABSTRACT

UL

NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89)Prescribed by ANSI Std. Z-39-18298-102