|
[Sponsors] |
velocity BC for pourous wall (pressure dependendend darcy law) |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
May 19, 2017, 10:40 |
velocity BC for pourous wall (pressure dependendend darcy law)
|
#1 |
New Member
Stefan
Join Date: Oct 2015
Posts: 24
Rep Power: 10 |
Dear FOAMers,
i wanna investigate a dead end pipe with some porous areas at the wall. The porosity variates along the axis, so I will divide the wall in different parts and each part sould get an individual BC depending on the local porosity. At the inlet of the pipe I will define a pressure BC. Simulation will be steady-state. My goal is to analyze the averaged leakage for each part of the wall. I don't wanna simulate the outside of the pipe. I just wanan look at the massflow through the porous wall(s) (which will be treated like an outlet patch). The fluid is incompressible so i get the massflow with u*rho*area of the wall. Therefore I'm looking for a velocity BC for porous walls which follows darcys law. I thought of setting atm pressure at the wall as p-BC. The velocity BC should calculate the preassure drop between in and outside the pipe (according to the results of the flow field inside) and use a manually given permeability factor k, to calculate the velocity. Simplified u=deltaP*k (normal to the wall) u=0 (not normal to the wall => there should be shearing) in the end it is the exact oppposite of the slip condition: There, the normal component is zero (sliding). It would be a wall (no fluxes can pass) but there is finally no shearing based on the fact that we assume that there are no viscous effect. I had a look through the provided BC of OpenFOAM but could not find a suitable one for my problem. I also searched in the forum - no success. May some of you could help me out which one i have to use, or, in case there isn't such a BC, which one shound be suitable for start programming by myself. Thanks a lot Stefan |
|
May 29, 2017, 07:53 |
BC pourous wall
|
#2 |
New Member
Stefan
Join Date: Oct 2015
Posts: 24
Rep Power: 10 |
Hi again,
nobody got an idea according this problem? It would help a lot. Thank you. |
|
Tags |
boundaries condition, darcy's law, permeable wall, porous walls, velocity boundary |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Wind tunnel Boundary Conditions in Fluent | metmet | FLUENT | 6 | October 30, 2019 12:23 |
Centrifugal fan | j0hnny | CFX | 13 | October 1, 2019 13:55 |
Centrifugal fan-reverse flow in outlet lesds to a mass in flow field | xiexing | CFX | 3 | March 29, 2017 10:00 |
Variables Definition in CFX Solver 5.6 | R P | CFX | 2 | October 26, 2004 02:13 |
how to print the results from CFX-4.2 | cfd_99 | Main CFD Forum | 5 | June 21, 1999 09:23 |