โ Scribed by D.K. Heist; M. Ravichanran; F.C. Gouldin
No coin nor oath required. For personal study only.
The results of an experimental and computational study of the flow over a separation-inducing corner formed by a surface-mounted, triangular obstacle located close to a 90 ยฐ turn are presented. The study was undertaken as part of a process to develop and validate numerical simulation methods for predicting incinerator and furnace flows, and the flow configuration studied is characteristic of such devices. The predictions from FEM simulations based on the standard k-e turbulence model are compared with results from two-component LDV measurements from a water tunnel experiment. In the numerical simulations, two different outflow boundary conditions are used, one being the stress-free outflow condition and the other making use of special outflow elements. The results from the numerical simulation with the special outflow elements are in better agreement with the experimental results than those from the simulation with the stress-free outflow boundary condition. With the special outflow elements, the mean velocities and the gradients of the mean vertical velocity are well predicted. In the region separating the recirculation zone from the freestream where turbulent transport is most important, good agreement between the experiment and the special outflow elements simulation is achieved for the turbulent kinetic energy.
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