Transonic Drag Prediction Using an Unstructured Multigrid Solver

 Documents

 0 views
of 21
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Description
NASA/CR-2002-211455 ICASE Report No. 2002-5 Transonic Drag Prediction Using an Unstructured Multigrid Solver Dimitri J. Mavriplis ICASE, Hampton, Virginia David W. Levy Cessna Aircraft Company, Wichita, Kansas April 2002 Report Documentation Page Report Date 00APR2002 Report Type N/A Dates Covered (from... to) Contract Number Grant Number Program Element Number Author(s) Dimitri J. Mavriplis, David W. Levy Project Number Task Number Work Unit Number Performing Organization Name(s) and Addres
Share
Tags
Transcript
  NASA/CR-2002-211455ICASE Report No. 2002-5 Transonic Drag Prediction Using an UnstructuredMultigrid Solver  Dimitri J. Mavriplis ICASE, Hampton, Virginia David W. LevyCessna Aircraft Company, Wichita, Kansas April 2002  Report Documentation Page Report Date  00APR2002 Report Type  N/A Dates Covered (from... to)  - Title and Subtitle  Transonic Drag Prediction Using an UnstructuredMultigrid Solver Contract Number   Grant Number   Program Element Number   Author(s)  Dimitri J. Mavriplis, David W. Levy Project Number   Task Number   Work Unit Number   Performing Organization Name(s) and Address(es)  ICASE Mail Stop 132C NASA Langley Research CenterHampton, VA 23681-2199 Performing Organization Report Number   Sponsoring/Monitoring Agency Name(s) andAddress(es)   Sponsor/Monitor’s Acronym(s)   Sponsor/Monitor’s Report Number(s)   Distribution/Availability Statement  Approved for public release, distribution unlimited Supplementary Notes  ICASE Report No. 2002-5 Abstract  This paper summarizes the results obtained with the NSU3D unstructured multigrid solver for the AIAADrag Prediction Workshop held in Anaheim, CA, June 2001. The test case for the workshop consists of awing-body con guration at transonic ow conditions. Flow analyses for a complete test matrix of liftcoecient values and Mach numbers at a constant Reynolds number are performed, thus producing a set of drag polars and drag rise curves which are compared with experimental data. Results were obtainedindependently by both authors using an identical baseline grid, and dierent re ned grids. Most cases wererun in parallel on commodity cluster-type machines while the largest cases were run on an SGI Originmachine using 128 processors. The objective of this paper is to study the accuracy of the subjectunstructured grid solver for predicting drag in the transonic cruise regime, to assess the eciency of themethod in terms of convergence, cpu time and memory, and to determine the eects of grid resolution onthis predictive ability and its computational eciency. A good predictive ability is demonstrated over a widerange of conditions, although accuracy was found to degrade for cases at higher Mach numbers and liftvalues where increasing amounts of ow separation occur. The ability to rapidly compute large numbers of cases at varying ow conditions using an unstructured solver on inexpensive clusters of commoditycomputers is also demonstrated. Subject Terms    Report Classification  unclassified Classification of this page  unclassified Classification of Abstract  unclassified Limitation of Abstract  SAR Number of Pages  19  The NASA STI Program Office . . . in Profile Since its founding, NASA has been dedicatedto the advancement of aeronautics and spacescience. The NASA Scientific and TechnicalInformation (STI) Program Office plays a keypart in helping NASA maintain thisimportant role.The NASA STI Program Office is operated byLangley Research Center, the lead center forNASA’s scientific and technical information.The NASA STI Program Office providesaccess to the NASA STI Database, thelargest collection of aeronautical and spacescience STI in the world. The Program Officeis also NASA’s institutional mechanism fordisseminating the results of its research anddevelopment activities. These results arepublished by NASA in the NASA STI ReportSeries, which includes the following reporttypes:ãTECHNICAL PUBLICATION. Reports of completed research or a major significantphase of research that present the resultsof NASA programs and include extensivedata or theoretical analysis. Includescompilations of significant scientific andtechnical data and information deemedto be of continuing reference value. NASA’scounterpart of peer-reviewed formalprofessional papers, but having lessstringent limitations on manuscriptlength and extent of graphicpresentations.ãTECHNICAL MEMORANDUM.Scientific and technical findings that arepreliminary or of specialized interest,e.g., quick release reports, workingpapers, and bibliographies that containminimal annotation. Does not containextensive analysis.ãCONTRACTOR REPORT. Scientific andtechnical findings by NASA-sponsoredcontractors and grantees.ãCONFERENCE PUBLICATIONS.Collected papers from scientific andtechnical conferences, symposia,seminars, or other meetings sponsored orcosponsored by NASA.ãSPECIAL PUBLICATION. Scientific,technical, or historical information fromNASA programs, projects, and missions,often concerned with subjects havingsubstantial public interest.ãTECHNICAL TRANSLATION. English-language translations of foreign scientificand technical material pertinent toNASA’s mission.Specialized services that complement theSTI Program Office’s diverse offerings includecreating custom thesauri, building customizeddata bases, organizing and publishingresearch results . . . even providing videos.For more information about the NASA STIProgram Office, see the following:ãAccess the NASA STI Program HomePage at http://www.sti.nasa.gov ãEmail your question via the Internet tohelp@sti.nasa.govãFax your question to the NASA STIHelp Desk at (301) 621-0134ãTelephone the NASA STI Help Desk at(301) 621-0390ãWrite to:NASA STI Help Desk NASA Center for AeroSpace Information7121 Standard DriveHanover, MD 21076-1320
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks