Computing three-dimensional incompressible flows with vortex elementsThe techniques, capabilities and applicability of numerical models of three-dimensional, unsteady vortical flows with high Re are assessed. Vorticity is calculated only in appropriate regions and the velocity field is derived from the boundary conditions. Vorticity is assumed to take the shape of tubes with uniform core structures in the case of turbulence. The efforts being made to simplify equations for dense collections of vortex filaments in order to make them tractable to computer simulations are described. The effectiveness of vorticity arrow representations for accurately describing vorticity fields near surfaces is discussed, along with Lagrangian vortex elements, which may be of use in modelling the rotational part of flows around bluff bodies, nonuniform density flows and chemically reacting flows.
Document ID
19850049035
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Leonard, A. (NASA Ames Research Center Computational Fluid Dynamics Branch, Moffett Field, CA, United States)