unable to float the boat!!

sanjay · January 10, 2012, 02:31

I am working on tunnel hull speed boat. The wave generated is making the body submerged even with less amplitude of wave. Please help me resolve the problem!!!!

ping · January 10, 2012, 04:30

ensure your boat flows in still water first in still water - weight could be incorrect.

sanjay · January 10, 2012, 05:24

it doesn't folat it appears submerged. Should I change the position of ship ? serious help required!!!

ping · January 10, 2012, 05:51

as I said you need to run with zero in/out flow the case for a few seconds (eg using a timestep of about 0.05s) and monitor vertical motion (sink). if there is no movement then the gravity forces are balanced by the bouyancy forces. if the hull is in a submerged condition after this run, then your hull mass is too high for this hull shape - simple hydrostatics. do the boat tutorial in the Help if this does not understood. ensure you have freed the required DOFs!

sanjay · January 11, 2012, 00:01

I found the solution myself. Actually its got nothing to do with buoyancy. Just go to VOF wave >> head wave >> adjust the point on water level, its simple as that

. Thanks for the sharing your opinion

. Some more questions to come

http://aerosapien.blogspot.com/

ping · January 11, 2012, 01:54

well if you had followed my instructions, the boat would rise to the surface of where your flat wave had been incorrectly set, so it is in fact about bouyancy!

sanjay · January 11, 2012, 23:54

I do agree about buoyancy. What u said is right.

regards
http://aerosapien.blogspot.com/

January 11, 2012, 00:01		#5
sanjay Member aerosapien Join Date: Sep 2010 Posts: 59 Rep Power: 16	I found the solution myself. Actually its got nothing to do with buoyancy. Just go to VOF wave >> head wave >> adjust the point on water level, its simple as that. Thanks for the sharing your opinion. Some more questions to come http://aerosapien.blogspot.com/

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January 10, 2012, 04:30		#2
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	ensure your boat flows in still water first in still water - weight could be incorrect.

January 10, 2012, 05:51		#4
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	as I said you need to run with zero in/out flow the case for a few seconds (eg using a timestep of about 0.05s) and monitor vertical motion (sink). if there is no movement then the gravity forces are balanced by the bouyancy forces. if the hull is in a submerged condition after this run, then your hull mass is too high for this hull shape - simple hydrostatics. do the boat tutorial in the Help if this does not understood. ensure you have freed the required DOFs!

January 11, 2012, 01:54		#6
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	well if you had followed my instructions, the boat would rise to the surface of where your flat wave had been incorrectly set, so it is in fact about bouyancy!

January 11, 2012, 23:54		#7
sanjay Member aerosapien Join Date: Sep 2010 Posts: 59 Rep Power: 16	I do agree about buoyancy. What u said is right. regards http://aerosapien.blogspot.com/