3d Numerical Simulation Of Turbulent Flow. Complex Boundary Crossing

On the basis of the rule of Reynolds-averaged, the control equation forincompressible flow are obtained. The numerical procedure is essentially pressure-correction type of finite difference formulation on general curvilinear coordinates systembased on pressure as solving variable. By analyzing and commenting on the methods of flow field prediction and a varietyof turbulence models, this paper directs that numerical analysis is a kind of important andeffective method solved the engineering problems. And standard k-ε turbulence modelis applied to estimate the Reynolds stress of Reynolds averaged N-S equation. Wall-function is adopted for laminar sublayer near the surface of the solid wall.This paper is a part of developing procedure analyzing flow fields in runner ofturbine, the shape of the duct calculated is characterized by its complex and twist, so thePoisson equations are solved to generate body-fitted grid in order that being generatedgrids are of quite smoothness and orthogonality.Flows in Taylor curved duct, flows over a backward-facing step and flows in rotatingducts are calculated respectively, and the calculation results close to the availableexperimental datum. Then the flow fields in a sophisticated configuration are calculated.The results are shown that this procedure has a strong ability to calculate the flow-field insophisticated configurations.