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 Wysłany: Sob 20:07, 08 Sty 2011 Temat postu: ugg boots billig Multi-grid method with the rotor |
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Multi-grid method with the rotor transonic inviscid flow
CARADONNAFX, TUNGC. ExperimentalandanalytieMstudiesofahelicopterrotorinhover 【RJ. NASATM · 81232,1981. [6] Yang Aiming. Nested grid-based helicopter rotor flow Reynolds averaged Navier-Stokes equation modeling [D]. [PhD thesis], Northwestern Polytechnical University, 2000. [7] SWANSONRC, TURKELE. Multistageschemeswithmulti · dforEulerandNavier-Stokesequations 【R]. NASATP a 3631,1997. EulersolutionsoftransonicflowforaheficopterrotorinhoverusingmultigridmethodYANGAi-Ming,[link widoczny dla zalogowanych], WENGPei. fen, QIAOZhi-de2 (1.sorlUniversity, ShanghaiInstituteofApaiedMathematics & Mechanics,[link widoczny dla zalogowanych], 200072, China; 2.CADR.NorthwesternPolytechnicalUr,; ~ rsity. Xi '∽ 710072, China) Abstract: AneffectivemultigridmethodhaeendevelopedtoacceleratetheEulersolutionoftransonicflowforahe'licopterrotorinhover. Themotiveofusingmultidmethodisthefollowingl ~ a $ ons: theflownearthehubisincompress-ibleflow, whichcanslowtheconvergence; forthemostpart,[link widoczny dla zalogowanych], thenetflowvelocityattheplaneoftherotorandintherotorwakeitselfiscomprisedofthevelocitiesinducedbythewakeespeciallybythetipvortices. sothefulldevelopmentofwakeisveryimportantfortheconvergenceoftheflowfield, butitrequirealongtimeinthenumericalsimulation. Accordingly, theapplicationofaccelerationmeasureisveryusefulfortherotorcomputation. InthisEulersolver,[link widoczny dla zalogowanych], weusethecell-cen-teredfinitevolumemethodinspaceandadvancethesolutionintimeusingfive-stepRunge-Kuttamethod. Athree-levelVcyclemuhigridmethodisimplementedinatransonicflowcomputation. Numericalresultsshowthatthemultigridmethodforrotorflowislesseffectivethanforfixedwings,[link widoczny dla zalogowanych], howeveritcanspeeduptherotorflowconvergencerateremarkably. Keywords: helicopterrotor; multigrid; Eulerequations
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