湍流算例porousBlockage出现错误

[merlinizlf]

东岳老师好，大家好：
我是正在学习OpenFOAM的新手
最近在学习模拟湍流时运行pisoFoam下自带算例porousBlockage时出现错误：

Create time
Create mesh for time = 0
Reading field p
Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
No MRF models present
Creating finite volume options from "constant/fvOptions"
Selecting finite volume options model type explicitPorositySource
    Source: porosity1
    - selecting cells using cellZone porousBlockage
--> FOAM FATAL ERROR:
Cannot find cellZone porousBlockage
Valid cellZones are 0()

    From function void Foam::fv::cellSetOption::setCellSet()
    in file cellSetOption/cellSetOption.C at line 142.

FOAM exiting

请问是什么原因呢？

此外，还想问一下，如果使用标准k-epsilon模型（RAS算例下）模拟湍流，进出口使用什么条件比较合适呢？