# Applying vibrations to pipe

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 January 19, 2021, 23:31 Applying vibrations to pipe #1 New Member   Joseph Join Date: Jan 2021 Posts: 15 Rep Power: 5 Hello All, I am new to STAR-CCM and am really struggling to figure out how to go about setting up this simulation. Basically, I want to set-up a simulation where I have a flexible pipe which has water flowing through it and oscillates up and down. I should also add that for this simulation I am not really interested on the interactions between the water and the pipe but rather just how the flow changes as the pipe oscillates transversely. Based on what I have learned from about STAR-CCM so far, it seems that the morphing motion with a custom field function would be the best way to go about this, but I cannot for the life of me get anything to work. Is there something I am missing? Has anyone else attempted a similar scenario? Thank you all for your help in advance! PS: This link -> https://www.acs.psu.edu/drussell/Dem...ing/Fixed.html demonstrates the type of oscillatory motion I hope to impose on the pipe/fluid domain.

 January 20, 2021, 08:58 #2 Senior Member   Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20 the tutorial Tutorials > Solid Stress > Fluid-Structure Interaction: Vibrating Pipe is a good starting point and just ignore all the solid stress stuff and its region and apply the required motion to the pipe wall boundary in some sort of field function as a vertex velocity probably jseamon1 likes this.

January 20, 2021, 10:50
#3
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Joseph
Join Date: Jan 2021
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Quote:
 Originally Posted by ping the tutorial Tutorials > Solid Stress > Fluid-Structure Interaction: Vibrating Pipe is a good starting point and just ignore all the solid stress stuff and its region and apply the required motion to the pipe wall boundary in some sort of field function as a vertex velocity probably
Ok, great! I will look at that, thank you! Is there any documentation or tutorials on creating vertex velocity field functions that you could point me towards?

 January 21, 2021, 00:16 #4 Senior Member   Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20 this tutorial gets you quite a long way to what you need: Tutorials > Motion > Morphing: Cylinder with Boundary Motion but you will need a more complex field function that includes \$Time in the formula to create harmonic motion. and i would consider using one of the other morpher displacement spec. methods called 'total' probably rather than velocity jseamon1 likes this.

 January 21, 2021, 13:57 #5 New Member   Joseph Join Date: Jan 2021 Posts: 15 Rep Power: 5 Ok, great! I will give that a shot. Thank you!

 February 1, 2021, 21:16 #6 New Member   Joseph Join Date: Jan 2021 Posts: 15 Rep Power: 5 Thank you all for your help! Those tutorials were extremely helpful and I was able to get the vibrating motion I was looking for. Thanks again!

 Tags morphing mesh, morphing motion