# Wave response at zero speed

Discussion in 'Boat Design' started by Navall, Jan 21, 2016.

1. Joined: Jun 2012
Posts: 3
Likes: 0, Points: 0, Legacy Rep: 10
Location: Delft

### NavallNew Member

Hi all!

I need to calculate the wave response (heave,pitch,roll) of a capesize bulk carrier at a sea state of approximately 1.5~2m significant wave height at shallow waters(?). The ship depth is 20m and the sea-to-seabed depth is 20m.

Does anyone know if there is any software to calculate wave responses at zero speed (at shallow waters)?

Maxsurf is not good in that for sure....

Last edited: Jan 21, 2016
2. Joined: Oct 2008
Posts: 6,641
Likes: 649, Points: 113, Legacy Rep: 2488
Location: Japan

When you say calculate...do you mean by hand or using software?

To establish ROAs is not a straight fwd calculation. However there are enough design guides of added mass and shaped hulls etc in order to get a "feel" for the response. But the calculations are lengthy and somewhat tedious. But must be calibrated against known data of equivalent vessels for better accuracy.

3. Joined: Aug 2002
Posts: 14,560
Likes: 684, Points: 123, Legacy Rep: 2031
Location: Milwaukee, WI

### gonzoSenior Member

If the ship depth is 20m and the sea-to-seabed depth is 20m, the ship is aground. Are you trying to calculate how the ship will pound on the bottom?

4. Joined: Jun 2012
Posts: 3
Likes: 0, Points: 0, Legacy Rep: 10
Location: Delft

### NavallNew Member

Hand calculation could be an option if they provide adequate results. Do you know any such method?
However, I mainly focus on finding the appropriate software for wave responses at zero speed and shallow(?) water.

@GONZO: The ship is not aground. Her draft is less than the depth of course (i.e. D=20m, Tmax=18.2m). I am trying to clalculate the UKC.

5. Joined: Aug 2004
Posts: 2,803
Likes: 365, Points: 83, Legacy Rep: 2040
Location: Port Orchard, Washington, USA

### jehardimanSenior Member

6. Joined: Jan 2002
Posts: 2,696
Likes: 149, Points: 63, Legacy Rep: 2229

### Leo LazauskasSenior Member

There are several programs that can do that, e.g. AQWA, GL Rankine,
MOSES, OCTOPUS, PDStrip, and WAMIT.

The attached paper by Gourlay et al compares their performance for a range
of speeds (including zero) for two panamax (and one post-panamax) container
ships in shallow water.

#### Attached Files:

• ###### OMAE2015-41691-FINAL.pdf
File size:
1.1 MB
Views:
189
Last edited: Jan 21, 2016

7. Joined: Nov 2006
Posts: 53
Likes: 0, Points: 6, Legacy Rep: 10
Location: Europe

### S17665Designer

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.