CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Aeroelastic Analysis of Bridges

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 15, 2005, 10:02
Default Aeroelastic Analysis of Bridges
  #1
bridgehl4
Guest
 
Posts: n/a
Dear friends, I want to analysis the effects of wind flow (with/out turbulence) on bridges such as vortex shedding, galloping, flutter and buffeting. So I would like to know that whether the FLUENT can solve these problem. Thank you very much!
  Reply With Quote

Old   April 15, 2005, 10:30
Default Re: Aeroelastic Analysis of Bridges
  #2
Luca
Guest
 
Posts: n/a
Hi!!!! Fortunately sometimes someone deals with my problems...I'm actually facing a flutter problem with Fluent about an airplane...Yes you ca do what you want to do, even if it's not so easy...Luca
  Reply With Quote

Old   April 24, 2005, 08:39
Default Re: Aeroelastic Analysis of Bridges
  #3
Mehdi Ghoddosy
Guest
 
Posts: n/a
Dear sir: Modelling bridges with fluent because of varius type and irregular shapes seams to an ambisous project. Also in bridges wind frequency is most important than drag force and vortex shredding thererfore you can not see any bridges designed aerodynamic. but al bridge designer account for wind frequency and speed. regards
  Reply With Quote

Old   April 24, 2005, 09:01
Default Re: Aeroelastic Analysis of Bridges
  #4
bridgehl4
Guest
 
Posts: n/a
Dear Mehdi, Thanks for your reply. But I think that in long-span bridges, one of the most important thing is aerodynamic. That is the reason why all cable-based bridges need wind-tunnel experiments which are very costly. Regards
  Reply With Quote

Old   April 24, 2005, 20:56
Default Re: Aeroelastic Analysis of Bridges
  #5
khairy
Guest
 
Posts: n/a
Dear bridgehl4 :i agree some what with Mehdi Ghoddosy, but i think that ANSIS is the most efficent software to study the flow vibration,and forces on the bridge simultanously which u needed, thanks Eng.khairy-Egypt
  Reply With Quote

Old   April 30, 2005, 09:09
Default Re: Aeroelastic Analysis of Bridges
  #6
Mehdi Ghoddosy
Guest
 
Posts: n/a
Dear Sir: I th e case of long-span bridges especially cable stated beridges ypu are right. In this bridges because of low natural frequency of structure the frequency is far from common wind frequencies and therefor amplification factor is near 1. However, you have to compute amplification factor in any case first. Wind frequency in any locations differs from another and may be near to your bridge frequency. If the amplification factor is near 1 then account for drag force. However I think solving this problem with fluent is to much time consuming if not impossible. Assume a cable stated bridge with truss beams(that is most pupolar). Assume 300m for each span. then you have size your mesh to be smooth enough to account for truss members(maximum 5m with less than 30cm distance between members); how much nodes you have to use. Can this problem be solved with any computer. In addition must important criteria in this sisuation is bridge periodic vibrations that cause the material to creep and fail. Fluent can not model movement of bridge due to wind or at least vibration. I think you have to find another way to solve your problem. I guess ANSYS could be the way. That was just my idea. wish to be right this time. best regards and good luck.
  Reply With Quote

Old   April 30, 2005, 23:36
Default Re: Aeroelastic Analysis of Bridges
  #7
bridgehl4
Guest
 
Posts: n/a
Dear Mehdi Ghoddosy, Thank you very much for your detailed reply. I completely agree with you about the bridge problem. I have read an announcement of both FLUENT and ABAQUS that they integrated FSI (Fluid-Structure interaction) in their new version (FLUENT 6.2, ABAQUS 6.5). However, It seems that we need both of it and another third-party software at the same time to solve FSI problems. I do not know how about ANSYS. Anybody knows about FSI problem, please recommend me. Thank you
  Reply With Quote

Old   May 2, 2005, 03:05
Default Re: Aeroelastic Analysis of Bridges
  #8
Luca
Guest
 
Posts: n/a
Hi, I deal wirt FSI for aeroelastic analysis of a complete airplane (flutter, static aeroelasticity, dynamic response). I use Fluent for the aerodynamic pressure load determination. Then I have my own code (a UDF) to solve structural dynamic (CSD), tp interface structural and CFD meshes and to move the grid in Fluent. So you can avoid using Abaqus or Ansys. In other case you can use MPCCI for abaqus-fluent interface. Luca
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modelling the cross aisle direction of a steel selective rack for model analysis m8rix ANSYS 0 September 20, 2011 10:28
multifield problems on ia64 zegtuhetmaar ANSYS 7 October 21, 2010 13:18
3D analysis of Ahmed body Irshad22 FLUENT 0 December 17, 2009 05:33
Short Course: Computational Thermal Analysis Dean S. Schrage Main CFD Forum 11 September 27, 2000 17:46
Is CFD Science or Art ? John C. Chien Main CFD Forum 36 October 5, 1999 12:58


All times are GMT -4. The time now is 10:41.