Abstract
The computational analysis of two-dimensional laminar vortex shedding from a rectangular bluff body in a confined channel flow is presented. In this analysis it is shown how the use of the conventional first-order hybrid-upwind convective differencing scheme provides an excellent example of the effects of multi-dimensional false diffusion. These effects are reduced substantially with the introduction of a new scheme, SU CCA (skew upwind corner convection algorithm), for the modelling of convective transport, resulting in the promotion of continuous vortex shedding. The introduction of the SVCCA scheme indicates that a complex transient phenomenon such as vortex shedding can be analysed using a modified first-order convection algorithm. The results also demonstrate the SVCCA scheme's ability to represent convective transport more accurately and hence help minimize the effects of multi-dimensional false diffusion in the numerical solution of the Navier-Slokes equation applied to laminar flow.
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