CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Wall roughness for superhydrophobic surface with air film

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 12, 2022, 09:36
Default Wall roughness for superhydrophobic surface with air film
  #1
New Member
 
Alpaslan KILAVUZ
Join Date: Nov 2016
Posts: 2
Rep Power: 0
AshinDaisy is on a distinguished road
Hello there,

in my masters I studied the flow around an AUV and compared experimental / numerical results. Managed to get 20% error within the wake for turbulent characteristics using LES + VOF (Open Channel Flow to set a free-surface) and multibox meshing

Atm in my PhD I'm trying to model the same AUV with superhydrophobic surface. Air is to injected within AUV to create an air film to reduce the skin friction.

The AUV I'm working on is a bare hull without appandages. It is 0.2 im length and 0.04 m in diameter

here is the AUV profile

I'm using FLUENT 2020 R2 and ANSYS workbench defaults (geometry designer and mesher) for domain creation and meshing.

Problems:

I'll carry out PIV measurements within the year, using 8-12 micron superhydrophobic solution applied to the AUV surface

however I cannot set wall roughness using LES. Only RANS and SAS are open up the wall roughness settings from the boundary section.



Questions

1- Can the auto generated roughness (under wall boundary condition settings) maintain air film like manually generated roughness?

2- Considering my 3-D geometry, should I generate 8-12 micron roguhness in a random or orderly manner around the AUV surface? Would it be viable considering the size of the AUV? If so, how would I do it?
AshinDaisy is offline   Reply With Quote

Reply

Tags
ansys, auv, drag, roughness height, superhydrophonic

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Laminar flow and wall roughness junbbung FLUENT 2 November 26, 2022 22:22
Setting the height of the stream in the free channel kevinmccartin CFX 12 October 13, 2022 22:43
CFD analaysis of Pelton turbine amodpanthee CFX 31 April 19, 2018 19:02
Does realizable k-e model with enhanced wall treatment work for surface roughness? zyy95900 FLUENT 5 November 15, 2017 17:13
Eulerin wall film model problem about film thickness ss890527 FLUENT 1 April 18, 2017 11:29


All times are GMT -4. The time now is 15:56.