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ABSTRACT
To study the suitability of numerical simulations for predicting incinerator-related flows, an experimental and computational study of an obstacle flow with some of the features of incinerator flows is performed. Results of LDV measurements from a water channel experiment on the flow over a triangular obstacle and from a concurrent FEM simulation using the standard κ-ε turbulence model are compared. The reattachment length predicted by the computations agrees to within 3% with the experimentally determined value. The mean velocity profiles and the shapes of the turbulent kinetic energy profiles show good agreement. A more realistic model of the flow in an incinerator is studied briefly and provides information on the appropriate choice of outflow boundary conditions for computing flows in truncated domains. The standard κ-ε model was found to be useful in making predictions of separated flows with similarities to those found in incinerators. Special exit boundary conditions which allow for a pressure variation independent of the viscous normal stresses were found to predict realistic outflow velocity profiles.