Abstract
Scholars at home and abroad has researched part of the insufficient development of medium and small diameter tube flow-field distribution and experimental study on the flow measurement methods. With the development of personal computers, academics at home and abroad using CFD part for medium and small diameter non-fully developed pipe flow numerical simulation of flow and flow field distribution measurement methods were studied. China's distribution in the large-caliber short duct flow field numerical simulation have obtained some research achievements, but emphasis on wind tunnel measurements. Numerical simulation of flue gas environment, modeling, rarely turn into the practical application of research. Fluid flow in a curved pipe has long been concerned about the issue that is engaged in the study on the internal flow of workers. With the development of fluid mechanics theory, computer technology, numerical simulation methods, computational fluid dynamics has become an important method for simulation of turbulent flow. This paper adopts standard k-e model to 90 ° bend three dimensional numerical simulation, which offers guidance function for the non circular cross section numerical simulation. II. Mathematical model
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