Direct numerical simulation of helical vortices
by Ivan Delbende; Maurice Rossi; Benjamin Piton
International Journal of Engineering Systems Modelling and Simulation (IJESMS), Vol. 4, No. 1/2, 2012

Abstract: We herein present a direct numerical simulation method aimed at describing the dynamics of helical vortices such as those developing in the wake of propellers and wind turbine or helicopter rotors. By enforcing a helical symmetry, the 3D incompressible Navier-Stokes equations are reduced to a 2D problem which we solve using a generalised vorticity/streamfunction formulation. In this framework, we simulate the viscous dynamics of one or several helical vortices and describe quasi-steady states as well as long-time (or far-wake) dynamics. In particular, several types of merging in the two helical vortex systems are identified.

Online publication date: Sat, 30-Aug-2014

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