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

Simulating vortex induced vibrations (VIV) through UDF

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

LinkBack Thread Tools Search this Thread Display Modes
Old   May 30, 2018, 07:25
Default Simulating vortex induced vibrations (VIV) through UDF
Join Date: Sep 2016
Posts: 43
Rep Power: 9
diggee is on a distinguished road
Hello everyone! I want to simulate VIV experienced by a cylinder that is only allowed to oscillate in the transverse direction to free stream direction. The vibrations are free i.e. motion of cylinder will be solely due to the fluctuating forces acting on it due to vortex shedding. By no mechanism is the cylinder being forced to oscillate. I want to do this through UDF+dynamic mesh as this option is extremely faster than a full blown 2 way FSI simulation. So far I have come across 2 approaches; the more popular approach has a UDF like here. The second approach uses the 6DOF UDF solver, like here. I have the following doubts

1. Since I only want to model free VIV, is the first approach apt for me? In the UDF, things like spring constant and dampness have been defined whose practical relevance I am unable to see for my case. My cylinder is pivoted and free to move in 1 direction in air then why things like k and c?

2. Fluent manual's descirption of 6DOF solver makes it seem perfect for my case but I don't often see users use it across this forum even for cases similar to mine. Moreover the manual says forces are computed by the solver itself than why do people define a spring force even for this solver (see above linked page)? Am I misunderstanding anything here?

Can anyone please help?!
diggee is offline   Reply With Quote


6dof, dynamic mesh, fsi 2-way coupling, viv, vortex

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
vortex induced vibration dorin CFX 11 December 1, 2009 13:03
Request for UDF code for forced vibrations jagadeesh putta Main CFD Forum 0 November 21, 2007 21:46
Vortex Induced Vibration modelling Kwong FLUENT 0 March 24, 2007 00:41
"bit" phenomenon in Vortex Induced Vibration? JOEY Main CFD Forum 0 August 4, 2006 08:49
Vortex Induced vibration of subsea pipeline Mobasheri FLUENT 5 February 9, 2006 07:07

All times are GMT -4. The time now is 17:13.