We used a dynamically scaled mechanical model of the fruit fly Drosophila melanogaster to study how changes in wing kinematics influence the production of unsteady aerodynamic forces in insect flight. We examined 191 separate sets of kinematic patterns that differed with respect to stroke amplitude, angle of attack, flip timing, flip duration and the shape and magnitude of stroke deviation. Ins...

Multi-wing centrifugal fans are wildly used in the central air-conditioning. The influence of dimensionless clearance volute-tongue on aerodynamic performance and noise is studied by numerical simulation experimental tests this paper. complicated internal flow related to unsteady a fan with multiple wings investigated simulation. Besides, circumstance analyzed. It testified that ameliorated usi...

When computing aerodynamic noise from moderate Mach number flows, compressible flow equations are often solved numerically in a finite region of space containing the noise sources and the near acoustic field [1]. However, whether this is done by direct numerical simulation or with some modeling approximations (e.g., large-eddy simulation or unsteady Reynolds averaging), such simulations typical...

An aerodynamic model for applications to external flows is formulated that provides a great tradeoff between computational cost and prediction accuracy. The novelty of the work ability deal with any unsteady flow problem, irrespective frequency motion kinematics. model, baptized FALCon, combines an in-house vortex lattice method infinite-swept wing Navier–Stokes solver. two specialized methods ...

In the analysis of flexible flapping wings of insects, the aerodynamic outcome depends on the combined structural dynamics and unsteady fluid physics. Because the wing shape and hence the resulting effective angle of attack are a priori unknown, predicting aerodynamic performance is challenging. Here, we show that a coupled aerodynamics/structural dynamics model can be established for hovering,...

We have designed and implemented concept of hierarchical structures consisting of simulation results stored in unsteady (time-varying) datasets. It allows incremental, progressive and easy construction and replaying of various simulation configurations with interactive visualization of results. The ability of modification of simulation boundary conditions is available in every node of the datas...