|
[Sponsors] |
[Commercial meshers] Total Boundary Layer Height for an airplane |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
April 10, 2019, 11:29 |
Total Boundary Layer Height for an airplane
|
#1 |
Member
MWRS
Join Date: Apr 2018
Location: Islamabad
Posts: 99
Rep Power: 8 |
Hello everyone. For a certain airplane containing multiple parts (Wing, Stabilizer etc.), how does one calculate the total boundary layer thickness?
Does one specify the total height differently for each individual component in ICEM or is it wise to specify one common thickness obtained using the mean aerodynamic chord of the wing for all individual parts? |
|
August 21, 2019, 10:09 |
|
#2 |
Member
MWRS
Join Date: Apr 2018
Location: Islamabad
Posts: 99
Rep Power: 8 |
Anyone? Please help
|
|
August 22, 2019, 03:03 |
|
#3 |
Senior Member
Carlo_P
Join Date: May 2019
Location: Italy
Posts: 176
Rep Power: 7 |
Hey waseeqsiddiqui..long name!
I think that you are talking about the prismatic cells next to the wall, correct? In that case, it is not always simple to know before the simulation. You have to calculate the first cell high (h1) and then the total tickness is equal to h1*(er -er*(N+1))/(1-er) where er is the expansion ratio (normally 1.2) and N is the total number of cells. h1 can be calculate with: https://www.cfd-online.com/Tools/yplus.php . h1 is the eximated wall distance. After the simulation, you have to check if the yplus is between the correct range (1-10) for k-omega (20-200) for k-epsilon. If yplus is inside this range in all the parts, you can maintein the same total tickness. If yplus is too different in the different parts, you have to reduce the totaltickness where yplus is too high and increase if too low. Sorry, but it is a complex answer! |
|
August 22, 2019, 10:01 |
|
#4 |
Member
MWRS
Join Date: Apr 2018
Location: Islamabad
Posts: 99
Rep Power: 8 |
Okay, Thanks!
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Validity & transformation of boundary layer equations | Obad | Main CFD Forum | 2 | April 27, 2015 02:59 |
[snappyHexMesh] Boundary layer generation problems | ivan_cozza | OpenFOAM Meshing & Mesh Conversion | 0 | October 6, 2010 13:47 |
Convective Heat Transfer - Heat Exchanger | Mark | CFX | 6 | November 15, 2004 15:55 |
New topic on same subject - Flow around race car | Tudor Miron | CFX | 15 | April 2, 2004 06:18 |
errors | Fahad | Main CFD Forum | 0 | March 23, 2004 13:20 |