The reduction of false diffusion in the simulation of vortex shedding
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, SUCCA (skew upwind corner convection algorithm), for the modeling of convective transport, resulting in the promotion of continuous vortex shedding. The introduction of the SUCCA scheme indicates that a complex transient phenomenon such as vortex shedding can be analyzed using a modified first-order convection algorithm. The results also demonstrate the SUCCA 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-Stokes equation applied to laminar flow.
- Publication:
-
Journal of Mechanical and Engineering Science
- Pub Date:
- 1992
- Bibcode:
- 1992JMecE.206..399C
- Keywords:
-
- Bluff Bodies;
- Channel Flow;
- Computational Fluid Dynamics;
- Diffusion;
- Laminar Flow;
- Two Dimensional Flow;
- Vortex Shedding;
- Convergence;
- Flow Geometry;
- Navier-Stokes Equation;
- Upwind Schemes (Mathematics);
- Fluid Mechanics and Heat Transfer