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 Boat Design Forums wave pattern in Hullspeed program (Maxsurf)

#1
11-05-2010, 07:46 PM
 sobo Junior Member Join Date: Oct 2010 Rep: 10 Posts: 27 Location: malaysia
wave pattern in Hullspeed program (Maxsurf)

hi there

I got some difficulty here.Hope that someone who expert in Hullspeed or wave pattern could help me explain my problem.

As you can see in the pictures attached below, that were the wave pattern produced by my boat at different speed.

My question are
1) what is the standard explanation to show the different between each wave pattern (other than explain about wave produce at critical, subcritical, supercritical speed).
2) why there are different in colour for different speed as in the picture?
3) what does the different in colour means?
Attached Thumbnails

#2
11-18-2010, 08:26 AM
 Jenny Giles Perpetual Student Join Date: Jul 2009 Rep: 177 Posts: 59 Location: Sydney
Quote:
 Originally Posted by sobo hi there I got some difficulty here.Hope that someone who expert in Hullspeed or wave pattern could help me explain my problem. As you can see in the pictures attached below, that were the wave pattern produced by my boat at different speed. My question are 1) what is the standard explanation to show the different between each wave pattern (other than explain about wave produce at critical, subcritical, supercritical speed). 2) why there are different in colour for different speed as in the picture? 3) what does the different in colour means?
I am waiting for some answers too!!! I think the colors are scaled in some way between the lowest and highest waves.

The waves don't look right to me, like why is there no change in front of the hulls.
#3
11-18-2010, 08:57 AM
 Ad Hoc Naval Architect Join Date: Oct 2008 Rep: 2488 Posts: 5,194 Location: Japan
Wave pattern question
#4
11-26-2010, 09:42 PM
 Leo Lazauskas Senior Member Join Date: Jan 2002 Rep: 2229 Posts: 2,696 Location: Adelaide, South Australia
sobo: Your wave patterns seem to be in deep water. Reference to the thread Ad Hoc recommended
will show you how the Kelvin angle changes with water depth.
That is definitely not happening with your wave patterns.

Jenny: As I said to you and your fellow Launcestonians last week, my guess is that Hullspeed
does not include the "local field" in the wave elevation calculations. That is probably
why the water is flat ahead of the bow.

Leo.
#5
03-10-2011, 07:24 PM
 sobo Junior Member Join Date: Oct 2010 Rep: 10 Posts: 27 Location: malaysia
#6
03-11-2011, 06:57 PM
 surf Junior Member Join Date: Mar 2004 Rep: 10 Posts: 9 Location: Norway
Is it possible to import an IGES hull file into Maxsurf and from Hullspeed get the wave pattern from the actual hull?
Which input is needed to get the wave pattern beside from the hull shape. Speed and draught?
#7
03-12-2011, 03:22 AM
 zeroname Naval Architect Join Date: Oct 2008 Rep: 90 Posts: 276 Location: Europe
Yes you can import IGES hull file to maxsurf, and then save it as *.msd file. which you will open in Hullspeed.
Other input data is Speed range, Method of calculating , Overall efficiency and also need to set units.
__________________
DAre To DreAm
#8
03-12-2011, 06:31 AM
 sobo Junior Member Join Date: Oct 2010 Rep: 10 Posts: 27 Location: malaysia
surf: you should set the draught earlier using maxsurf before you transfer it into hullspeed. and as told by zeroname, you can set speed range,overall efficiency,etc in hullspeed. for method of calculation, you should check which method is suitable for your design. and one more thing, make sure you set your vessel type in maxsurf first.whether it is monohull or catamaran or trimaran. it will effect your result in hullspeed since it only calculate starboard side of the model and mirror it.

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