For years, many papers have been given in flow field analysis arguing for the wider applicability of the numerical simulation method. Many problems are still unsolved, however, including optimum calculational methods and conditions for the numerical scheme of the algorithm, turbulence models, grid density, boundary conditions, etc. This is partly due to the complex contours of the flow field and also because flow separation or a large wake complicates matters, preventing the simple transfer of technology from aeronautical and astronautical fields. Turbulent separating flows are encountered in many engineering applications and play important roles. The advent of powerful digital computers and the development of hypotheses pertaining to turbulence modeling are bringing about a dramatic improvement in our ability to calculate flow phenomena of engineering relevance. Such a predictive capability for turbulent separating flow is, however, conspicuously lacking. Turbulent separating flows occupy a unique position within the general group of flows. The intense streamline curvature present in separating flows produces a strong anisotropy in the normal stresses, and dramatic changes in the shear-stress field. In spite of this, however, most available turbulent models are based on the Boussinesqviscosity assumption, which cannot capture the interaction between separation and the turbulence stress field. At this moment, it is necessary to develop calculation methods including the turbulence models.
KeywordsFluid Flow Turbulence Model Large Eddy Simulation Unstructural Grid Incompressible Fluid Flow
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