湍流强度（turbulent intensity）：I=0.16Re^(-1/8)；其中，雷诺数：Re=vdρ/η；v-平均速度；P2=P1-1/2ρv^2；P1-进口压力；P2=出口压力；d-口径；ρ-介质密度；η——介质动力粘度系数；流体力学书上都有；或者，在网上下载个湍流强度计算的小程序，输入参数即可；...
如果来流是充分发展的，湍流强度就可能较高了。至于计算公式，fluent说明书上虽然后有，但除非你的模拟精度要求很高，不然就没有这个必要，说明书上讲，只要保证边界值不至于太不符合物理规律，以至于影响到计算结果或是收敛情况。所以你只要大致给个就可以了。
在使用湍流模型时,无论是k-epsilon,k-omega还是turbulence-transition模型,计算最终得到的入口端turbulent intensity与计算前设置的值(约5%)大相径庭,计算得到的至少100%以上。我个人感觉这样的结果肯定不现实,turbulent intensity再怎么大也不可能超过100%,对不?但同时我也疑问,正常情况下计算的值和设置的值也会不同...
UDF for ABL turbulent intensity monali2015m April 19, 2022 18:29 by monali2015m 0 555 Fluent UDF and Scheme Programming How to calculate fluctuating velocity and turbulence intensity in RANS (OF) purnp2 April 11, 2022 12:47 by ptpacheco 4 3,032 OpenFOAM Post-Processing CFD validati...
FLUENT 高手进阶—Modeling Turbulent Flows in Fluent
Dear all: I read the past discussion about turbulent inlet generation. Many people suggest the paper "A digital filter based generation of inflow
The distribution of turbulent intensity,turbulent kinetic energy,and turbulent dissipation rate was got along radial direction on the centerline;and the corresponding relationship was given. 在应用Realizablek-ε模型对静水环境中径向射流数值模拟的基础上,对其紊动特性进行分析,得到了各种等值线的平面分布图、射...
GAMBIT and FLUENT software has been used. There are presented graphs and contours for axial and radial velocities of waterjet, contours for the turbulence kinetic energy (TKE) and graphs representing the ...
effective? turbulent? laminar? viscosity #1 MIssNancy Guest Posts: n/a Guys, I have got two stupid questions for you1) In the famous drag-particle reynoulds number: Cd=Rep/24(1+0.15*Rep^2/3); for which Rep=dp*Ur*rho/mu; now my question is, to determine the particle Reynoulds nu...
I use the turbulence intensity and turbulence viscosity ratio. When I input the large viscosity ratio, it makes the dissipation rate small according to the formula; vice versa. ( you can see the formulahttp://www.cfd-online.com/Wiki/Turbu...ary_conditions) ...