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1 个结果
  • 简介:Thedirect-forcingfictitiousdomainmethodisextendedtosimulatethelocomotionofapassivelypitchingfoil.Ourstudyfocusesonthehysteresisphenomenonthatthecriticalfrequencyforthereverseofthelocomotiondirectionofthewingincaseofdecreasingfrequencyissmallerthanthatincaseofincreasingfrequency.Inoursimulations,thehysteresisphenomenonisproducedbyimposingdifferentinitialconditionsatasamefrequency.Ourresultsindicatethattheratiooftheheavingamplitudesoftwofoiledgesiscrucialtothedirectionofthefoil'shorizontalmotion,andtheamplitudeoftheleadingedgeisgenerallysmaller.Thecriticalfrequenciesforthereverseofthelocomotiondirectionareincreased,whenthefoil-fluiddensityratioisdecreasedorthespringconstantisincreased.Thecriticalfrequenciesinthebi-stabilityregimealsodependontheinitialvelocityimposed,andthehysteresisloopgenerallybecomeslargeriftheinitialvelocitiesareclosertotheterminallocomotionvelocitiesofthefoil.

  • 标签: 运动方向 滞后现象 数值研究 临界频率 俯仰 初始速度