Journal ArticleDOI
Discrete Vortex Method for Simulating Unsteady Flow
TLDR
In this paper, a discrete vortex method to simulate the separated flow around an aerofoil undergoing pitching motion is described, where vorticity generated in the thin layer around the body is discretized into vortices in accordance with themultipanel surface representation by convectionand diffusion.Abstract:
Amodi® ed discrete vortexmethod to simulate the separated ow around an aerofoil undergoingpitchingmotion is described The vorticity generated in the thin layer around the body is discretized into vortices in accordance with themultipanel surface representation By convectionand diffusion the vortices are released from the body and advanced in the wake as determined by the Biot± Savart law and random-walkmodel, respectively Both unsteady static and pitching cases are presented, and comparisonwith the test data illustrates that, without prior knowledge of the developing separation and reattachment points for the model, good agreement has been achievedread more
Citations
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Unsteady flow past an airfoil pitching at a constant rate
TL;DR: In this paper, the unsteady flow past a NACA 0012 airfoil that is undertaking a constant-rate pitching up motion is investigated experimentally by the PIDV technique in a water towing tank.
Journal ArticleDOI
An immersed interface method for the Vortex-In-Cell algorithm
TL;DR: In this article, a two-dimensional immersed interface technique for the vortex-in-cell (VIC) method for simulation of flows past bodies of complex geometry is presented, which is augmented by a local particle-particle correction term in a Particle-Particle Particle Mesh (P^3M) context to resolve sub-grid scales incurred by the presence of the immersed interface.
Journal ArticleDOI
Alleviation of airfoil dynamic stall moments via trailing-edge-flap flow control
TL;DR: In this paper, a discrete vortex method was used for the simulations of a NACA 0012 airfoil oscillating in an α(t) = 15 deg + 10 deg sin(ωt) motion at the reduced frequency of k = 0.173.
Dissertation
Simulation of flow around bluff bodies and bridge deck sections using CFD
TL;DR: In this paper, the simulation of flow around bluff bodies and bridge deck sections, in which unsteady nature and vortex shedding of flow are commonly found, using computational fluid dynamics (CFD).
Journal ArticleDOI
Numerical simulation of thrust generating flow past a pitching airfoil
TL;DR: In this paper, a systematic understanding of the influence of various parameters on thrust generation from an aharmonically pitching airfoil is presented, which is very similar to the inviscid theory prediction, however, in a clear deviation from inviscidian theorytrends, pitching at high amplitudes about high mean angle of attack, only drag is observed for high values of reduced frequency considered.
References
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Journal ArticleDOI
Numerical study of slightly viscous flow
TL;DR: In this paper, a numerical method for solving the time-dependent Navier-Stokes equations in two space dimensions at high Reynolds number is presented, where the crux of the method lies in the numerical simulation of the process of vorticity generation and dispersal, using computer-generated pseudo-random numbers.
Journal ArticleDOI
Progress in analysis and prediction of dynamic stall
TL;DR: In this paper, the authors defined the pitch-moment coefficient as the ratio of pitch moment to pitch moment, and used it to measure the pitch moment of a chord chord.
Unsteady flow past an airfoil pitching at a constant rate
TL;DR: In this paper, the unsteady flow past a NACA 0012 airfoil that is undertaking a constant-rate pitching up motion is investigated experimentally by the PIDV technique in a water towing tank.
Journal ArticleDOI
An Experimental Investigation of an Airfoil Undergoing Large-Amplitude Pitching Motions
TL;DR: In this paper, the authors performed near-surface hot-wire experiments on an airfoil undergoing large-amplitude pitching motions about its quarter chord and showed the dramatic effect of pitch rate on flow structure.
Journal ArticleDOI
Unsteady flow past an airfoil pitching at a constant rate
TL;DR: In this article, the unsteady flow past a NACA 0012 airfoil that is undertaking a constant-rate pitching up motion is investigated experimentally by the PIDV technique in a water towing tank.