CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > FLOW-3D

Advice on vertical axis turbine modelling

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 24, 2010, 11:57
Default Advice on vertical axis turbine modelling
  #1
New Member
 
James
Join Date: Jul 2010
Posts: 25
Rep Power: 16
bramdiff is on a distinguished road
Dear all

I have just started my PhD and need to model a vertical axis turbine. I am new to cfd and would like your advice.

I need to model the turbine flaps opening and closing, they open/close depending on the fluid flow, and are not motor driven. Their movement is restricted to 180 degrees.

My problem is a bit like trying to model the wind blowing a door open, and if the wind was coming from the other direction, it would blow the door shut. my question is how would you model this? is it a fsi problem? or do I have to predict the position of the flaps (not desirable)? I have been told that I would need to write a udf to calculate the movement based on the pressure difference either side of the flap- is this a recommended way of solving this? or in flow 3d can the general moving object handle this?

I have been advised that either fluent or cfx have this capability, but it looks like flow-3d could also be up to the job- which software do you think is more appropriate?

Any ideas/suggestions are extremely helpful as I am trying to gather as much infomation as possible at the moment.

Many thanks in advance

James
bramdiff is offline   Reply With Quote

Old   September 26, 2010, 17:03
Default
  #2
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Location: Sante Fe, New Mexico, USA
Posts: 337
Rep Power: 18
MuxaB is on a distinguished road
James,

If the flap is defined as a coupled-motion GMO component, its dynamics will be computed in FLOW-3D as a function of the pressure and viscous forces along the surface of the flap.

It is a straight-forward task if the axis of rotation is fixed. You can also fix the angular movement, on both sides of the range, to limit it to 180 degrees.
MuxaB is offline   Reply With Quote

Old   September 26, 2010, 17:32
Default
  #3
New Member
 
James
Join Date: Jul 2010
Posts: 25
Rep Power: 16
bramdiff is on a distinguished road
Thanks MuxaB,

the flaps will need to also move around a central axis- the problem is similar to a typical lift type turbine- like a darrieus model, but the flaps/or foils are free to move as already described. being able to restrict their movement to 180 degrees is excellent. with this additional rotation in mind do you still think that i would be able to model it?

Do you/ does anyone know how easy it is to obtain a trail version of the software, im in contact with them at the moment but was wondering what the chances are of getting it, im keen to start learning it!!

Many thanks for all your help!!

James
bramdiff is offline   Reply With Quote

Old   September 28, 2010, 23:10
Default
  #4
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Location: Sante Fe, New Mexico, USA
Posts: 337
Rep Power: 18
MuxaB is on a distinguished road
i don't see why you'd have problems getting a trial version.

I can't me completely sure without seeing the geometry of the device, but sounds it is quite doable. You should ask FSI when requesting a trial license, so you don't waste your time learning it. Send FSI a schematic of the device to get a more reliable opinion.
MuxaB is offline   Reply With Quote

Old   October 23, 2010, 16:11
Default
  #5
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Location: Sante Fe, New Mexico, USA
Posts: 337
Rep Power: 18
MuxaB is on a distinguished road
Quote:
Originally Posted by dorramide7 View Post


wamly welcome

Sure all pro gamer are most welcome... if you can reach out to them it would be great!! Thanks a lot



Ya it will be great if they both get active on this forum...
and share their exp. with gaming...
Looks like you got into a wrong forum by mistake...
MuxaB is offline   Reply With Quote

Reply


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
High torque coefficient Cm for Vertical Axis Wind Turbine (VAWT) tony00 FLUENT 11 July 23, 2018 07:13
Reversed flow in Vertical axis wind turbine Anonymized_JL1 FLUENT 2 April 11, 2012 04:13
Advice on vertical axis turbine modelling bramdiff CFX 4 September 28, 2010 05:27
Advice on vertical axis turbine modelling bramdiff FLUENT 0 September 24, 2010 10:12
Vertical Axis Wind Turbine courtjester140 ANSYS 2 June 22, 2010 11:27


All times are GMT -4. The time now is 20:32.