|
[Sponsors] |
Aerodynamic roughness length to equivalent sand-grain roughness? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
July 12, 2019, 01:51 |
Aerodynamic roughness length to equivalent sand-grain roughness?
|
#1 |
New Member
Shannon Kieran
Join Date: Jul 2019
Posts: 3
Rep Power: 7 |
Hi,
I am carrying out a Fluent simulation for a city block. In order to set the appropriate surface roughness for the wall boundary condition for the ground surface, I need to specify the sand-grain roughness height (Ks). However, because it is an atmospheric boundary layer problem, not a pipe system, the surface roughness parameters I do have are the aerodynamic roughness length (zo), and also approximate drag cofficient (Cd). I've had a look at the theory guide, user guide and also various textbooks but haven't had any luck finding out how I can convert zo or Cd to an equivalent approximate Ks. Any assistance would be appreciated! (I am a university student) |
|
July 12, 2019, 04:17 |
|
#2 |
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 |
you may try to find something here
https://www.sciencedirect.com/search...rtBy=relevance best regards |
|
August 19, 2019, 21:01 |
Solved
|
#3 |
New Member
Shannon Kieran
Join Date: Jul 2019
Posts: 3
Rep Power: 7 |
Just thought I would post the following in case anyone has the same question later on.
I eventually found the answer to my question in this article: Blocken B, Stathopoulos T, Carmeliet J. 2007. CFD simulation of the atmospheric boundary layer:– wall function problems. Atmospheric Environment 41(2): 238-252. © Elsevier 2007. |
|
November 15, 2019, 10:16 |
|
#4 |
New Member
anarchitect
Join Date: Jan 2017
Posts: 3
Rep Power: 9 |
I have read this article for numerous times, but it does not offer an exact solution. Could you please share how you solved your problem?
|
|
August 7, 2020, 11:50 |
|
#5 |
Member
Join Date: Apr 2020
Posts: 76
Rep Power: 6 |
This paper offers a direct solution to equivalent sand grain height, as is needed to be input in Fluent for ABL simulation
http://www.cobee2018.net/assets/pdf/p/063.pdf |
|
May 29, 2024, 16:21 |
|
#6 | |
New Member
Moataz
Join Date: May 2024
Posts: 1
Rep Power: 0 |
Quote:
|
||
Tags |
roughness height, wall boundary conditions |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Equivalent sand grain roughness alternatives | arun1994 | Main CFD Forum | 5 | May 9, 2018 11:38 |
Equivalent length of helical coil | Jeffreyb723 | Main CFD Forum | 0 | August 18, 2017 22:26 |
equivalent sand roughness height | LSC | CFX | 3 | December 23, 2012 12:50 |
Roughness length, interpolation, unphysical dissipation rate on the ground | apaleftos | STAR-CD | 0 | February 14, 2011 04:37 |
equivalent sand grain roughness | attax | CFX | 0 | September 8, 2005 09:44 |