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June 24, 2019, 09:45 |
Von-Karman Vortex shedding
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#1 |
New Member
omid
Join Date: Jun 2019
Posts: 15
Rep Power: 7 |
Hello
I'm trying to simulate FSI example proposed by Turek-Hron in which flow over a cylinder causes vortex shedding behind the cylinder. When I simulate this example using just CFD simulation (not FSI) with the velocity profile given in the article, I can see vortex shedding behind the cylinder. But whenever I add a beam shape structure behind the cylinder to run with the two way FSI approach, nothing happens behind the cylinder and I can not see Von-Karman effect. Does any one have any idea what should i change in my simulation. I'm attaching two pictures of my both simulations. |
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June 24, 2019, 14:52 |
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#2 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,188
Rep Power: 23 |
Wouldn't the tail reduce/stop vortex shedding?
Also it looks like you have walls in the model with the tail on the top and bottom, but not in the one with just a cylinder? These walls could reduce vortex shedding as well, and should be moved further away. |
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June 25, 2019, 03:49 |
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#3 | |
New Member
omid
Join Date: Jun 2019
Posts: 15
Rep Power: 7 |
Quote:
https://youtu.be/15VOBaQ2oJY |
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June 25, 2019, 08:14 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,864
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You never said the tail was flexible. This is a challenging simulation and you can expect to need to do some careful work before it is completed. I would recommend you do a static Von Karman vortex simulation and check you can successfully model the vortex on a station before starting FSI.
When you add the FSI component start off with the tail quite mechanically stiff so it does not flex much. Once that is working then reduce the stiffness to the correct amount.
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Tags |
cfd, fsi 2-way coupling, two way fsi, von karman, vortex |
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