摘要

The paper reports computations of the flow and heat-transfer from a round jet impinging onto a concave semi-circular surface, designed to reproduce important flow features found in internal turbine blade cooling applications. Linear and non-linear eddy-viscosity models are applied, with wall-functions to cover the near-wall layer, and are shown to capture the overall flow characteristics. The standard, log-law based, form of wall-function is found to be inadequate in predicting the heat-transfer, and a more advanced form developed at Manchester (the AWF) is also tested. The exact way in which convective terms are approximated in this latter approach is shown to be crucial, and a form is presented which leads to stable and reasonably accurate solutions.