Numerical Simulation Of Confined Laminar Flow Over A Backward-
Facing Step Using A Novel Viscous-splitting Vortex Algorithm
Author(s)
R. W. Barber, A. Fonty
Abstract
Numerical simulation of confined laminar flow
over a backward-facing step using a novel
viscous-splitting vortex algorithm
R.W Barber', A. Font/
'Centre for Microfluidics, Department of Computational Science and
Engineering, Daresbury Laboratory, U.K.
~Lo\ver Base Engine Design Service, Renault, France
Abstract
A novel two-dimensional discrete vortex model is described for predicting low
Reynolds number laminar flow behind a backward-facing step. The numerical
model employs an 'operator splitting' technique to solve the vorticity-transport
equation governing the evolution of vorticity. A semi-Lagrangian scheme is used
to update the positions of the vortices during the advective stage of the
computation whilst an analytical diffusion algorithm employing Oseen vortices
is implemented during the diffusive time step. Redistributing the vorticity
analytically instead of using the more traditional random-walk method enables
the model to simulate steady flows directly and avoids the n
Keywords
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