# Vortex-induced Vibration (VIV)

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 May 29, 2012, 19:41 Vortex-induced Vibration (VIV) #1 New Member   ariza Join Date: Mar 2012 Posts: 3 Rep Power: 7 hai guys. I was a student last semester. I am currently working on final project with the topic of large-diameter cylinder viv in force due to currents and wave forces. I'm using a flow-3d for the simulation of vortex shedding. but until now I can not how. whether there are any of you guys can help me? provide solutions or suggestions how? thanks for the help.

August 6, 2012, 01:16
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Quote:
 Originally Posted by ariza hai guys. I was a student last semester. I am currently working on final project with the topic of large-diameter cylinder viv in force due to currents and wave forces. I'm using a flow-3d for the simulation of vortex shedding. but until now I can not how. whether there are any of you guys can help me? provide solutions or suggestions how? thanks for the help.
Hi Ariza,

what you mean of VIV is vibration due current around cylinder?
can you specified your question about? its your problem on modelling or meshing or else? please specified.

Thanks,
Hans

 August 6, 2012, 20:11 #3 New Member   ariza Join Date: Mar 2012 Posts: 3 Rep Power: 7 In my Case, VIV occurs because the combination of currents and waves. then, how steps to make simulation with Flow3D? such as modelling, input, solution, output... thx for your attention...

 August 6, 2012, 21:23 #4 New Member   Join Date: Mar 2009 Location: green earth, blue ocean Posts: 29 Rep Power: 10 For modeling, you can input the parameter (read manual handbook) then fill the BC with inlet and outlet as outflow. Put the parameter and fill current and wave value (note: use free surface for input wave value) hope this helpfull for your thesis.

August 6, 2012, 22:46
#5
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ariza
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Quote:
 Originally Posted by hans_ina For modeling, you can input the parameter (read manual handbook) then fill the BC with inlet and outlet as outflow. Put the parameter and fill current and wave value (note: use free surface for input wave value) hope this helpfull for your thesis.
thx a lot..
now i've finished my final exam..
23 september is my graduation..

October 24, 2012, 10:41
#6
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hossein
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Quote:
 Originally Posted by hans_ina For modeling, you can input the parameter (read manual handbook) then fill the BC with inlet and outlet as outflow. Put the parameter and fill current and wave value (note: use free surface for input wave value) hope this helpfull for your thesis.
******
hi, i dont underestand"read manual handbook"
which handbook?

 October 24, 2012, 11:28 #7 New Member   hossein Join Date: Sep 2012 Posts: 10 Rep Power: 7 i simulated cylindric in sea. but i dont know, how i can obtain "vortex" . 'vortex induce vibrating'

October 24, 2012, 21:32
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Quote:
 Originally Posted by hossein2357 ****** hi, i dont underestand"read manual handbook" which handbook?
Quote:
 Originally Posted by hossein2357 i simulated cylindric in sea. but i dont know, how i can obtain "vortex" . 'vortex induce vibrating'
Hi,

You can find it on help menu guy.

 May 31, 2013, 00:11 #9 Member   Join Date: Mar 2009 Location: adelaide, SA, Australia Posts: 32 Rep Power: 10 Hi All, I think for simulating vortex induced vibration of a bluff body (exm: circular) can be done using the similar case of wingMotion in the tutorial. I had simulated a circular cylinder using pimpleDyMFoam, and it worked for small reduced velocity u* < 1, but it blowed up at higher reduced velocity. I suspected this happened because the system was in resonance, so the vibration was very high in amplitude, where I can saw the mesh changed badly at that time. If you have suggestion on how I can simulate the VIV problem for high reduced velocity, please let me know. Cheers -mali- __________________ mali

May 31, 2013, 06:29
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Quote:
 Originally Posted by mali Hi All, I think for simulating vortex induced vibration of a bluff body (exm: circular) can be done using the similar case of wingMotion in the tutorial. I had simulated a circular cylinder using pimpleDyMFoam, and it worked for small reduced velocity u* < 1, but it blowed up at higher reduced velocity. I suspected this happened because the system was in resonance, so the vibration was very high in amplitude, where I can saw the mesh changed badly at that time. If you have suggestion on how I can simulate the VIV problem for high reduced velocity, please let me know. Cheers -mali-
what case you study?

 June 1, 2013, 00:25 #11 Member   Join Date: Mar 2009 Location: adelaide, SA, Australia Posts: 32 Rep Power: 10 Hi hans_ina, Thanks for your replay. I used 2D rigid circular cylinder attached with a vertical spring. Re based on diameter of the cylinder was in the range of 3000 to 22000, depending on the value of reduced velocity. For the elastic system, the mass ratio was 2.4 and the damping ratio is 0.0054 , similar to the case of Khalak and Williamson [1996]. Cheers, SJTU likes this. __________________ mali

 July 5, 2013, 08:42 damper #12 New Member   hossein Join Date: Sep 2012 Posts: 10 Rep Power: 7 Hi friend do you know, how can add damper for Cylinder in viv research or other work. we want simulate moving object with damper, but we dont know how we can add damper to object.

July 8, 2013, 09:58
3D mesh
#13
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Mike
Join Date: Jul 2013
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Hi all. I am trying to model 3D flow around a cylinder using ANSYS fluent. I need info on how to generate a 3D mesh. I tried generating the geometry but got stuck. please I need info on how to go about it.
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