Boat problem

Birkov · August 25, 2010, 03:28

Hi to all,

I would like to ask you if anyone have any experience with boat hydrostatics and hydrodynamics in STAR-CCM+ (6DOF, multiphase, etc.).
I'm Ansys CFX user but it seems that doesn't solve what I need.
In this time I choosing which CFD software I will use in future.
Thank you for your advise.

B.

eleazar · August 25, 2010, 06:27

i believe for this time star ccm is the best choice for that....
i also worked with cfx and i know for sure that the new star ccm is much better ( i do not know the changes of cfx from 2003)

Birkov · August 25, 2010, 06:41

CFX(Ansys 12.1) has 6DOF still as beta feature and will come as fully released in Ansys 13 but I have no time to wait for this version (yep it's relatively close) or even version 14.
I have no experience with STAR-CCM+ so I already ask for trial license. So will see.
I just read and saw few paper with focus on ships and it looks usable.

Thank you for your opinion.

B.

eleazar · August 25, 2010, 07:07

well star ccm is really very easy for this simulations... i believe that ansys is not so focus on that.

Vinicius · August 25, 2010, 08:24

STAR-CCM+ has a very good solver (comet was a VOF solver dedicated to the marine industry and was incorporated by CD-adapco in STAR-CCM+) and a dedicated post-processing for 6DOF problems!!

For sure is the best option for doing boat analysis!

tobe · September 8, 2010, 02:17

I model boats in Star most days and i am getting happy with the results (only been 8 months). What exactually do you want to know

Birkov · September 8, 2010, 02:29

I already spoke with guys from cd-adaco and I sure that this what I need. I just want know as much as is possible (forces, movements, stability, pitch, etc...).
Do you have any suggestions which can you give me? I don't mean anything specific. Just some hints.

Thank you very much.

B.

tobe · September 8, 2010, 02:35

Are you trying to model fluid flows at speed or rolling/pitching in sea conditions. Can you outline your problem a little better?

Birkov · September 8, 2010, 03:04

I would like to solve multiphase flow(air/water) with 6dof model (5dof actually, movement in x direction is locked) with flat water and than in waves (for various speeds).
What I want to know is complete hull behavior in specific conditions.

- Hull resistance for determining the required propulsion power.
- Hull stability.
- Hull pitch
- wave - piercing

and after that I will see what I need next.

Thank you.

B.

August 25, 2010, 03:28	Boat problem	#1
Birkov New Member Join Date: Jul 2009 Location: Prague Posts: 28 Rep Power: 0	Hi to all, I would like to ask you if anyone have any experience with boat hydrostatics and hydrodynamics in STAR-CCM+ (6DOF, multiphase, etc.). I'm Ansys CFX user but it seems that doesn't solve what I need. In this time I choosing which CFD software I will use in future. Thank you for your advise. B.

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August 25, 2010, 06:27		#2
eleazar Member Elena Cortin Join Date: Mar 2009 Location: Paris Posts: 65 Rep Power: 17	i believe for this time star ccm is the best choice for that.... i also worked with cfx and i know for sure that the new star ccm is much better ( i do not know the changes of cfx from 2003)

August 25, 2010, 06:41		#3
Birkov New Member Join Date: Jul 2009 Location: Prague Posts: 28 Rep Power: 0	CFX(Ansys 12.1) has 6DOF still as beta feature and will come as fully released in Ansys 13 but I have no time to wait for this version (yep it's relatively close) or even version 14. I have no experience with STAR-CCM+ so I already ask for trial license. So will see. I just read and saw few paper with focus on ships and it looks usable. Thank you for your opinion. B.

August 25, 2010, 07:07		#4
eleazar Member Elena Cortin Join Date: Mar 2009 Location: Paris Posts: 65 Rep Power: 17	well star ccm is really very easy for this simulations... i believe that ansys is not so focus on that.

August 25, 2010, 08:24		#5
Vinicius Member Vinicius Girardi Join Date: Mar 2009 Location: Sao Paulo, Brazil Posts: 80 Rep Power: 17	STAR-CCM+ has a very good solver (comet was a VOF solver dedicated to the marine industry and was incorporated by CD-adapco in STAR-CCM+) and a dedicated post-processing for 6DOF problems!! For sure is the best option for doing boat analysis!

September 8, 2010, 02:17		#6
tobe New Member toby Join Date: Aug 2010 Posts: 14 Rep Power: 15	I model boats in Star most days and i am getting happy with the results (only been 8 months). What exactually do you want to know

September 8, 2010, 02:29		#7
Birkov New Member Join Date: Jul 2009 Location: Prague Posts: 28 Rep Power: 0	I already spoke with guys from cd-adaco and I sure that this what I need. I just want know as much as is possible (forces, movements, stability, pitch, etc...). Do you have any suggestions which can you give me? I don't mean anything specific. Just some hints. Thank you very much. B.

September 8, 2010, 02:35		#8
tobe New Member toby Join Date: Aug 2010 Posts: 14 Rep Power: 15	Are you trying to model fluid flows at speed or rolling/pitching in sea conditions. Can you outline your problem a little better?

September 8, 2010, 03:04		#9
Birkov New Member Join Date: Jul 2009 Location: Prague Posts: 28 Rep Power: 0	I would like to solve multiphase flow(air/water) with 6dof model (5dof actually, movement in x direction is locked) with flat water and than in waves (for various speeds). What I want to know is complete hull behavior in specific conditions. - Hull resistance for determining the required propulsion power. - Hull stability. - Hull pitch - wave - piercing and after that I will see what I need next. Thank you. B.