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February 19, 2014, 17:37 |
3D wave simulation CFX
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#1 |
New Member
Jim
Join Date: Feb 2014
Posts: 11
Rep Power: 12 |
Hi,
Im using Ansys CFX to simulate 3D wave flow impacting on a buoyant hemispherical hull. The water then travels up through the hull through a series of ducts. I was wondering what is the best way to go about this simulation. I'm a new user of Ansys CFX. I've completed "free surface over a bump" and the "Buoy" tutorials but I'm not sure how a 3D simulation would work. Am I correct by creating the hull and inserting an enclosure, then meshing the part with inflation around the hull. I then set up transient analysis and created the two fluids, water and air. How should I go about creating a wave motion? Should I use a moving wall as in the 2D simulation? Or is there a different way I should go about this simulation? Any help is greatly appreciated. |
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February 19, 2014, 17:49 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,848
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Is the hull fixed, undergoes a known motion or does it float and its motion is coupled to the water?
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February 19, 2014, 18:06 |
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#3 |
New Member
Jim
Join Date: Feb 2014
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Sorry yes the hull is kept in place by cables but it is free to rock side to side (coupled with the motion of the water) which is what causes the water to travel through its ducts.
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February 19, 2014, 18:10 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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There is an example of a buoyant object on a air/water interface available from ANSYS CFX support. Contact your CFX support person and ask for the example simulation. That will be the best starting point for you.
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February 19, 2014, 18:14 |
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#5 |
New Member
Jim
Join Date: Feb 2014
Posts: 11
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Is this the 2D "Buoy" tutorial? I've looked at that but I'm still not sure how to go about a 3D simulation, is it the exact same method?
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February 19, 2014, 18:15 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Yes, that's it. Don't forget that CFX does not have a 2D solver. It models 2D by using a 3D simulation that is one element thick. So the example really is a 3D simulation.
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February 19, 2014, 18:19 |
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#7 |
New Member
Jim
Join Date: Feb 2014
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Ok thanks it should be exactly what I'm simulating so.
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February 20, 2014, 05:11 |
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#8 |
Senior Member
Mr CFD
Join Date: Jun 2012
Location: Britain
Posts: 361
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Later on down the line if you use the mixture model at the free surface I'd be interested to know how you calculate your interface length scale.
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December 27, 2022, 09:18 |
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#9 |
New Member
Fatin Ihsan
Join Date: Oct 2022
Posts: 2
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Can you suggest me some tutorials related to this problem. I am new in CFD and trying to solve a similar this.
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January 2, 2023, 01:54 |
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#10 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Rep Power: 144 |
Have a look at the tutorials on the ANSYS Customer or Academic site: https://support.ansys.com/Home/HomePage
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Tags |
buoyant, cfd, cfx, flow, wave |
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