3D simulation of buried pipe in Fluent
 

Hi
I want to simulate a gas pipe that buried in the soil with Fluent...my Purpose is calculation amount of gas leak from a hole on the pipe

http://8pic.ir/images/nkam1wbns37dwg8vlwds.jpg

my questions:
1) for simulation of soil, I should use porous condition??
2) I never work on on porous zone in Fluent...
I have two volumes in gamit.(1.cube region without pipe 2.pipe). in the Zones menu of Gambit, what Type (FLUID or SOLID), I should select for anyone of volumes??
3) in the Porous Zone menu of Fluent:
-what is "Direction-1" & "Direction-2" fields?
-- what is "Viscous Resistance" & "Inertial Resistance" and how to compute them?
---How to compute C0 & C1???(Power Law Model field)

Thanks a lot

any one cant answer my questions??? :(:(