CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

velocity profile at a ducted turbine intake

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 29, 2015, 12:44
Post velocity profile at a ducted turbine intake
New Member
Join Date: Oct 2011
Posts: 1
Rep Power: 0
Cajamarca is on a distinguished road
Hi Colleagues,

Iím just a beginner, learning through the tutorials and trying to duplicate the analysis I see in the research papers.

According to the theory, wind flows can be concentrated by duct, thus the wind velocity can be increased. This is proved in a study, by simulation. My simulation is completely different and I want to know the reason.
Here are the dimensions of duct:
Here is the simulation result of the study (velocity profile):
Here is the simulation result of the study (pressure profile):

In my simulations, the projected air flow does not completely get into the duct; instead large amount of it flows around the duct. Since, only small amount of flow flows into the duct, the velocity at the Ďintakeí is much smaller than the actual wind velocity. Iím not really sure,
- if I define wrong boundary conditions or set wrong simulation settings
- if the simulation in the research paper is wrong (probably not :P)
The settings I used in simulation:
- Analysis Type: Steady state
- Material: Air Ideal Gas, Pressure: reference pressure 1 Atm
- Inlet domain-> Normal speed: 4m/s,
- Outlet domain-> static domain, relative pressure: 0 Pa
- Wall domain-> No slip wall, roughness: smooth wall
Here are my simulation results:

Thank you for your dear comments,
Cajamarca is offline   Reply With Quote

Old   September 29, 2015, 20:02
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,701
Rep Power: 143
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
That is correct. The throat causes a high pressure region and the high pressure pushes air to the side so less air goes into the duct. This is all as expected. Your theory is going to have to account for this air which doe snot pass through the duct if you want your theory to be accurate.
ghorrocks is offline   Reply With Quote


cfx, concentrated, ducted, shrouded wind turbine, wind

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
Shear stress from velocity profile baranii2000 COMSOL 4 November 11, 2015 04:08
Patch fully developed velocity and turbulence profile over full domain Teumde FLUENT 2 June 29, 2015 13:47
Velocity profile interpolation FLUENT Mustafa1986 FLUENT 3 April 28, 2015 03:23
Variables Definition in CFX Solver 5.6 R P CFX 2 October 26, 2004 02:13
particle velocity and velocity profile HGG FLUENT 2 June 10, 2001 16:32

All times are GMT -4. The time now is 03:54.