WAKE MAP OF FLAPPING AIRFOIL AND DMD ANALYSIS
1.Introduction The mysterious aerodynamics mechanisms behind flapping wings always draw a great deal of attention of engineering scientists for a long time.Although some progress has been achieved,there are still some unsteady effects undiscovered.Understanding the flapping mechanism may enable the development of more effective flapping wing micro air vehicles.In 2008,Ramiro and Jean-Luc1 studied the vortex streets produced by a flapping foil in a hydrodynamic tunnel,using two-dimensional particle image velocimetry,and got the transition points between Bénard-von Kármán(BvK) wake to the reverse BvK(RBvK) vortex street in the flapping frequency-amplitude phase space.On this basis,Anders et al.2 mapped out the wake types in a phase diagram spanned by the width-based the Strouhal number and the dimensionless amplitude and investigated the relationship between the wake types and aerodynamic forces.In these studies,only the effect of heaving amplitudes is involved.In the current study,we will consider the effect of pitching amplitude,which might enrich the wake types around the flapping foil and bring more interesting phenomena.
Flapping airfoil Radial basis function(RBF) interpolation Wake map Dynamic mode decomposition(DMD)
HONGYU ZHENG FANGFANG XIE YAO ZHENG
Center for Engineering and Scientific Computation,and School of Aeronautics and Astronautics,Zhejiang University,Zhejiang 310027,China
国际会议
The 13th OpenFOAM Workshop(第13届OpenFOAM国际研讨会)
上海
英文
5-8
2018-06-24（万方平台首次上网日期，不代表论文的发表时间）