|
[Sponsors] |
April 5, 2021, 06:11 |
y+ viscous sublayer query
|
#1 |
New Member
Jowan S
Join Date: Feb 2021
Posts: 3
Rep Power: 5 |
Dear CFD users
As part of my project, I am looking at the lift and drag coefficients for an aerofoil by doing 2D CFD simulations in Ansys Fluent. I have been advised that my model should have a y+<11 to be in the viscous sublayer, however I was unable to get the y+ of my model less than 180. Am I correct in thinking that this is also acceptable as this is outside the buffer zone and so is approximated sufficiently by the wall functions? If so, what is the advantage of the y+ being in the viscous sublayer rather than in the turbulent zone? I am quite new to CFD and a novice in terms of y+ but would like to touch on it briefly in my reports so would appreciate it if some one was kind enough to answer these questions. Thanks a lot in advance! |
|
April 5, 2021, 17:48 |
|
#2 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 375
Rep Power: 12 |
It may work, sometimes the wall function is accurate, sometimes not, who knows... It is definitely better to solve the boundary layer rather than calculating it with a wall function, especially for airfoils. So yes, aim for y+ = 1, follow what your supervisor told you
|
|
April 5, 2021, 18:38 |
|
#3 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 375
Rep Power: 12 |
Double post error
|
|
Tags |
aerofoil, ansys fluent, ansys workbench, y plus ranges, y plus selection |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Y+ for viscous sublayer 2D airfoil | frossi | CFX | 1 | October 27, 2019 17:12 |
Residuals and forces spiraling out of control before failing | edomalley1 | OpenFOAM Running, Solving & CFD | 3 | September 7, 2018 10:42 |
Viscous Sublayer thickness | sihaqqi | OpenFOAM | 2 | January 1, 2015 17:16 |
viscous sublayer in turbuelt flows | student | Main CFD Forum | 0 | June 22, 2007 05:05 |
High aspect ratio in viscous sublayer? | Marius | Main CFD Forum | 0 | December 22, 2005 08:15 |