湍流模型下双柱绕流升阻力系数数值模拟

Simulation of drag and lift coefficients on two cylinders in flow field with turbulence model

本文使用流体软件FLUENT在RNGκ-ε湍流模型下,取雷诺数Re为20 000,间距比s/d等于1.75,模拟了双柱在串列、并列及两柱中心的连线与水流方向成30°和60°夹角错置这四种工况下的绕流升阻力系数。两圆柱阻力系数随夹角增大而增大,以并列双稳态对应的阻力系数最大。双柱串列时,下游圆柱阻力系数为负,两柱升力合力为0。双柱错置和并列时,两圆柱阻力系数都为正值,每个圆柱的升力合力都不为0,以并列发生双稳态流动时的升力合力最大。

Using software FLUENT in the RNG κ-ε turbulence model with Reynolds number 20000 and spacing ratio s/d equaling to 1.75, this article simulates two cylinders＇ drag and lift coefficients in four engineering conditions, as the two cylinders are set in serial, in parallel, as well as there are angles of 30 and 60 degrees between the line connecting column centers and the flow direction. The acquired conclusions are as follows： The drag coefficient increases with the increasing angles, which reaches maxim when the cylinders are in parallel, while it is minus with the cylinders in serial; as to the lift coefficient, the integral is not equal to 0 besides the two cylinders are in serial.