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Persistent URL http://purl.org/net/epubs/work/40226
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Record Id 40226
Title Numerical simulation of confined laminar flow over a backward-facing step using a novel viscous-splitting vortex algorithm
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 need to filter the numerical results to remove the oscillations created by the random-walk algorithm. Predictions from the model are compared against experimental velocity profiles of confined laminar flow behind a backward-facing step at Reynolds numbers of 73 and 229. In addition, computed reattachment lengths are compared against alternative numerical predictions. The results demonstrate that the analytical vortex diffusion scheme provides an effective alternative to random-walk procedures.
Organisation CCLRC , CSE , CSE-CEG
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article WIT Transactions on Modelling and Simulation 30 (2001): 117-126. https://www.witpr…d-simulation/30/3364 2001
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