|
[Sponsors] |
having trouble implementing airfoil with Wall Slip condition |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 22, 2014, 01:02 |
having trouble implementing airfoil with Wall Slip condition
|
#1 |
New Member
Mohammad Hossein Khozaei
Join Date: Nov 2011
Posts: 8
Rep Power: 15 |
Hello every body
I need to solve my problem on airfoil with wall Slip condition. as i found, i can put this condition in 2 ways: 1. enter a wall velocity 2. enter specified shear on the wall In both the ways i need to enter velocity or specified shear with 2 components (x & y). The problem is, as the normal-vector of the wall is changing around the airfoil and the wall-velocity (and specified shear) are both tangential to the wall, I need to have a local-coordinate-system in each point of the airfoil-wall to enter the velocity due to the local-coordinate-systems. (or something like this) (I don't have the Airfoil-wall-equation) (I have to check the results in different slip lengths, 10% slip to 50%, not 100% or free slip) (and then it must be solved in a complicated 3-D geometry, so i can't split the wall into some semi-linear parts.) I don't know how to do this and whether it works or not. can any body help me ? please. I really appreciate it. PS. In easy words, 10% slip means velocity on the wall is 10% of free-stream (tangential to the wall) (wall-slip-condition can be defined by 3 (related) parameters: 1. specified shear 2. wall-velocity 3. slip length, the definitions are available in literature, but in CFX and Fluent i just can enter specified shear or wall velocity, you can find them in wall-boundary-detail) (to avoid mathematical equation it's better to define a wall velocity than specified shear) Last edited by Khozaei4000; December 22, 2014 at 01:57. Reason: Make it more complete. |
|
December 22, 2014, 13:30 |
|
#2 |
Senior Member
Gonzalo
Join Date: Mar 2011
Location: Argentina
Posts: 122
Rep Power: 16 |
Mmm, in the case you want specify the velocity on each point of your airfoil, I don't think that is phisically posible. Imagine that situation where each point of the airfoil has a specific velocity relative to an inertial reference frame, so it wold be impossible for the airfol for not be teared apart in little pieces. In the case of specifying the Wall-shear, I don't think you can do it by the GUI, but you should try to do it by using an UDF, so take a look at the UDF manual of FLUENT and take alook if you can do it. In that case comment it to us
|
|
Tags |
wall slip |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Divergence in AMG solver! | marina | FLUENT | 20 | August 1, 2020 12:30 |
Partial slip Johnson-Jackson wall boundary condition OF 2.3.0 | mwaqas | OpenFOAM Running, Solving & CFD | 5 | December 4, 2014 19:44 |
Problem with restart solution in shape_optimization.py | robyTKD | SU2 Shape Design | 21 | May 29, 2013 10:26 |
how to set up a wall boundary condition according to calculated wall shear stress? | gameoverli | OpenFOAM Pre-Processing | 1 | May 21, 2009 09:28 |
How to write udf of slip wall condition | cxzhao | FLUENT | 0 | April 27, 2005 22:20 |