how simulation ship motion?

esmail · May 22, 2015, 05:51

hi
we need some information about ship motion simulation in cfx 14

ghorrocks · May 22, 2015, 07:23

Yes, CFX can do it.

A vague question gets a vague answer.

esmail · May 22, 2015, 09:36

hi dear
we want simulate the ship motion (heave and pitch)in calm water and wave.in this moment we made the domain and cylinder as sub domain.we want to this cylinder have motion same ship and slide to main domain. but we dont know the setting in cfx to do sliding .
thanks

ghorrocks · May 23, 2015, 07:23

There are two main ways of doing this:

1) Model the boat at a range of pitches and heaves and get the motion coefficients. Then use a ODE solver to solve the motion using the motion coefficients. This is by far the easiest way to solve it, but means that you have to assume the ship motion can be modelled with a set of simple motion coefficients. This cannot always be done.

2) Model the ship as a rigid body and do a 6DOF (degree of freedom) model on it. This is much more complex to model, but can handle a wider range of conditions (including when simple coefficients are not accurate). There are examples of how to do this sort of model in the CFX tutorials and more examples are available from CFX support.

esmail · May 23, 2015, 07:30

thanks
but i cant finf 3D rigid body simulation tutorial. if have some please know me

ghorrocks · May 23, 2015, 08:59

Try the example "Modelling a buoy using the CFX rigid body solver"

May 22, 2015, 05:51	how simulation ship motion?	#1
esmail New Member esmail Join Date: May 2015 Posts: 20 Rep Power: 11	hi we need some information about ship motion simulation in cfx 14

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May 22, 2015, 07:23		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Yes, CFX can do it. A vague question gets a vague answer.

May 22, 2015, 09:36		#3
esmail New Member esmail Join Date: May 2015 Posts: 20 Rep Power: 11	hi dear we want simulate the ship motion (heave and pitch)in calm water and wave.in this moment we made the domain and cylinder as sub domain.we want to this cylinder have motion same ship and slide to main domain. but we dont know the setting in cfx to do sliding . thanks

May 23, 2015, 07:23		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	There are two main ways of doing this: 1) Model the boat at a range of pitches and heaves and get the motion coefficients. Then use a ODE solver to solve the motion using the motion coefficients. This is by far the easiest way to solve it, but means that you have to assume the ship motion can be modelled with a set of simple motion coefficients. This cannot always be done. 2) Model the ship as a rigid body and do a 6DOF (degree of freedom) model on it. This is much more complex to model, but can handle a wider range of conditions (including when simple coefficients are not accurate). There are examples of how to do this sort of model in the CFX tutorials and more examples are available from CFX support.

May 23, 2015, 07:30		#5
esmail New Member esmail Join Date: May 2015 Posts: 20 Rep Power: 11	thanks but i cant finf 3D rigid body simulation tutorial. if have some please know me

May 23, 2015, 08:59		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Try the example "Modelling a buoy using the CFX rigid body solver"