|
[Sponsors] |
May 4, 2015, 03:44 |
Turbulence intensity - cross wind on a body
|
#1 |
Member
Fabio Malizia
Join Date: May 2010
Location: Leuven (Belgium)
Posts: 51
Rep Power: 16 |
Dear all,
I am studying the external aerodynamic of bluff bodies (e.g. car) in case of cross wind. Software used is Ansys Fluent. The geometry I used is placed inside a cylinder (its external surface is an interface with the external part of the domain), which I rotate to get the proper angle I need. In case of zero cross wind I use a very low turbulence intensity (0.02%, in agreement with a wind tunnel test I found). However in the presence of cross wind this value I guess is not correct since the wind will have a certain content of turbulence energy inside, that can affect the flow dynamics. My approach was to assume a turbulence intensity of the cross wind to 5% for each angle case, and insert as b.c. this value scaled with the resultant speed: where V is the cross wind speed and U is the velocity of the body. The result is a turbulence intensity that grow increasing the angle of attack (i.e. it increases with the increase of the cross wind influence on the flow). I guess this approach a quite simple one but my fear is that it can not be realistic. I found few papers about cross wind studies but I never found a description of how they set up this b.c. Do you have any suggestion about the approach I should use or any reference about it. Thanks for any help you can provide me. Best regards, Fabio |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Wind load on surface => Turbulence modelling | pz1337 | CFX | 3 | March 7, 2012 17:07 |
Turbulence intensity | Visser | Main CFD Forum | 2 | July 12, 2005 06:43 |
Turbulence Intensity | Luis | FLUENT | 2 | June 28, 2005 14:29 |
turbulence intensity | co2 | FLUENT | 2 | December 27, 2003 18:41 |
turbulence intensity | l.g.patil | FLUENT | 0 | February 8, 2002 12:18 |