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Old   February 19, 2014, 17:37
Default 3D wave simulation CFX
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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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Old   February 19, 2014, 17:49
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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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Old   February 19, 2014, 18:06
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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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Old   February 19, 2014, 18:10
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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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Old   February 19, 2014, 18:14
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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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Old   February 19, 2014, 18:15
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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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Old   February 19, 2014, 18:19
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Ok thanks it should be exactly what I'm simulating so.
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Old   February 20, 2014, 05:11
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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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