|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Vipul
Join Date: Jun 2013
Posts: 3
Rep Power: 13 ![]() |
Hi,
I'm trying to simulate a VIV of a circular cylinder. I am using the rigid body 6DOF solver to allow for the oscillation of the cylinder. I have attached an image of my mesh around the cylinder. The region in blue was defined as a subdomain and the motion of the rigid body was imposed on the cells in this region. Cells outside this region were stationary. This method works well for when the amplitude of oscillation of the cylinder is small. But as soon as the amplitude/cylinder dia ratio becomes greater than 0.3 I get a modulating response as the displacement (figure attached) and the amplitude of oscillation is two orders of magnitude lower than what is required. I am unsure about what is causing this. The Re is 120, the cylinder dia is 1.6mm, fluid is water and the reference values are from Anagnostopoulos and Bearman. The Strouhal number and Cl checked out when I did a transient analysis without FSI, I took a time step of 5e-3, which is 25 steps in one oscillation. If anyone could help me with this, I would really appreciate it. Cheers! |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
||
![]() |
![]() |
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
2 Way FSI Problem | alialibas | CFX | 23 | July 20, 2016 17:59 |
Two way Fsi Problem- Non linear problem | kmgraju | CFX | 4 | April 28, 2015 11:15 |
Oscillating cylinder - unidentified data | stefanos | FLUENT | 4 | June 4, 2013 13:12 |
FSI problem of improper constraint | moloykb | FLUENT | 3 | April 4, 2013 03:47 |
UDF of flow over oscillating cylinder 2D case | imharoon1 | FLUENT | 3 | August 28, 2011 01:46 |