NUMERICAL SIMULATION OF 3-D TURBULENT FLOWS IN A CUT-OFF VALVE AND ANALYSIS OF FLOW CHARACTERISTICS IN PIPE  

作　　者：HeZhi-guo MaoGen-hai YuanXing-ming 

机构地区：[1]DepartmentofCivilEngineering,ZhejiangUniversity,Hangzhou310027,China [2]DepartmentofHydraulicEngineering,YangzhouUniversity,Yangzhou225009,China

出　　处：《Journal of Hydrodynamics》2003年第4期86-91,共6页水动力学研究与进展B辑（英文版）

基　　金：ProjectsupportedbytheNaturalScienceFoundationofZhejiangProvince .(GrantNo :5 92 0 6 8)

摘　　要：The 3-D turbulent flows in a valve pipe were described by the incompressibleReynolds-averaged Navier-Stokes equations with an RNG k-ε turbulence model. With the finite volumemethod and a body-fitted coordinate system, the discretised equations were solved by the SIMPLESTalgorithm. The numerical result of a cut-off valve with curved inlet shows the flow characteristicsand the main cause of energy loss when fluid flows through a valve. And then, the boundaries ofvalve were modified in order to reduce the energy loss. The computational results of modified valveshow that the numerical value of turbulent kinetic energy is lower, and that the modified design ofthe 3-D valve boundaries is much better. The analysis of the result also shows that RNG k-εturbulence model can successfully be used to predict the 3-D turbulent separated flows and thesecondary flow inside valve pipes.The 3-D turbulent flows in a valve pipe were described by the incompressibleReynolds-averaged Navier-Stokes equations with an RNG k-ε turbulence model. With the finite volumemethod and a body-fitted coordinate system, the discretised equations were solved by the SIMPLESTalgorithm. The numerical result of a cut-off valve with curved inlet shows the flow characteristicsand the main cause of energy loss when fluid flows through a valve. And then, the boundaries ofvalve were modified in order to reduce the energy loss. The computational results of modified valveshow that the numerical value of turbulent kinetic energy is lower, and that the modified design ofthe 3-D valve boundaries is much better. The analysis of the result also shows that RNG k-εturbulence model can successfully be used to predict the 3-D turbulent separated flows and thesecondary flow inside valve pipes.

关 键 词：RNG k-ε turbulence model navier-stokes equations body-fitted coordinates finite volume method SIMPLEST valve pipe secondary flow 

分 类 号：O357.5[理学—流体力学] U173.4[理学—力学]