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Hull Performance - Error during Processing

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Old   September 8, 2022, 16:08
Default Hull Performance - Error during Processing
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maximiliano
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Hello to all

I have a few simulation where my vessel has a problem sinking. I use the add on of Hull Perfomance Workflof, and for any reasons taht i dont understand, the water start to enter by the deck. After several iterations, the water makes the vessel sink. I had use the add on a few times and I dont usually have problems, except with this condition. I dont know if it is a mesh issue (i dont think so because it happened with several and different cases)
I attached a image from the previous moment to the fully sink. This happens when the sink and trim is not fixed.
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File Type: png Captura de pantalla 2022-09-08 160727.png (52.9 KB, 17 views)
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Old   September 16, 2022, 14:07
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Does anybody have an idea of what could happen?

I tried to make a finesh mesh and decreasing the time step at the beggining of the simulation.
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Old   September 28, 2022, 04:08
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Is that right that the ship doesn't have a flat side?
Have you double checked the mass of the ship?
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Old   September 28, 2022, 07:23
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Hello
Thanks for answering
For your first Reply
Quote:
Originally Posted by Aeronautics El. K. View Post
Is that right that the ship doesn't have a flat side?
Yes, the Ship has a flat side, but it also happened with yachts with no flat side.

Quote:
Originally Posted by Aeronautics El. K. View Post
Have you double checked the mass of the ship?
Yes, the mass is consistent with half hull displacement.
Finally, I add a new image with the simulation where we can see that the wave is on the deck. Previous moment of physical time before the sink of the ship happens.
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Old   September 30, 2022, 12:42
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When the ship is at rest (i.e., no movement at all) how far below the deck is the free surface?
It seems to me that it's pretty close so it would follow that the bow wave would then cover the deck.

Also, with the shop at rest, could also release the sink degree of freedom and see if it floats or not.
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Old   September 30, 2022, 13:11
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Hello Lefteris

The ship at rest is floating, I checked previously in another software.
Also, draft as input, the mass is calculated on Star CCM+ and is in concordance with the previous one.

Also, yes, the wave generated could be on the deck and make the vessel sink, but there is an option that clips the superstructure.
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Old   September 30, 2022, 13:23
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Hi Maximiliano,

Perhaps the superstructure is irrelevant for the problem at hand but the bow bit of the hull might be rather important.

Perhaps you could try keeping it and see what happens.
If you really don't want the superstructure, you can split the geometry by patches and then get rid of those consisting the superstructure.
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Old   October 5, 2022, 11:25
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The SE is irrelevant and I don't have it into account, already split it but the water over the deck is still a problem.
If you have any other idea or suggestion, I would take it and make another simulation!
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Old   October 13, 2022, 08:13
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Dear all

I found a solution, maybe is not the best, but I added more depth to the main deck so the waves donīt reach the surface.
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Old   October 13, 2022, 09:13
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Quote:
Originally Posted by maximilianomavica View Post
Dear all

I found a solution, maybe is not the best, but I added more depth to the main deck so the waves donīt reach the surface.
Which is what I was hinting at in my previous reply.

Glad you found a solution.
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