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How to simulate a tether in an underwater tank

Posted: 20 Feb 2019, 15:47
by Muda
Hi,

I am trying to see how a tether would behave underwater if it is attached to an ROV that does a preset motion (like a spiral downwards). To create the tether I am going to use cylinders with spherical joints.

Currently I am stuck on how to create a water tank (5 m x 5 m x 5 m) that will provide me with the correct behaviour. How would I manage to create this water tank in such a way for it provide me with adequate results?

Also, if you have any suggestions on how I can further improve the simulation as I am a total newbie to this software, please let me know!


Thanks in advance,
Muda

Re: How to simulate a tether in an underwater tank

Posted: 21 Feb 2019, 14:58
by coppelia
Hello,

simulating a fluid is not that simple, and you will have to fake things by adding gravitation-compensation forces, and drag forces. Have a look how things were done in the HCM-R5 robot (models/robots/mobile/HCM-R5.ttm). There is a demo scene on buoyancy here.
Additionally, have a look here on how you can simulate a rope. But you will be limited by the rope length (i.e. number of individual segments), if you want the rope to behave in a stable manner.

Cheers

Re: How to simulate a tether in an underwater tank

Posted: 22 Feb 2019, 15:41
by Muda
coppelia wrote: 21 Feb 2019, 14:58 Hello,

simulating a fluid is not that simple, and you will have to fake things by adding gravitation-compensation forces, and drag forces. Have a look how things were done in the HCM-R5 robot (models/robots/mobile/HCM-R5.ttm). There is a demo scene on buoyancy here.
Additionally, have a look here on how you can simulate a rope. But you will be limited by the rope length (i.e. number of individual segments), if you want the rope to behave in a stable manner.

Cheers
Thanks for the suggestions and help! I will have a look at them in the next few days!

Re: How to simulate a tether in an underwater tank

Posted: 26 Aug 2021, 03:14
by xxm
coppelia wrote: 21 Feb 2019, 14:58 Hello,

simulating a fluid is not that simple, and you will have to fake things by adding gravitation-compensation forces, and drag forces. Have a look how things were done in the HCM-R5 robot (models/robots/mobile/HCM-R5.ttm). There is a demo scene on buoyancy here.
Additionally, have a look here on how you can simulate a rope. But you will be limited by the rope length (i.e. number of individual segments), if you want the rope to behave in a stable manner.

Cheers

Hello,

I want to simulate a soft rope, I do not what should I do and I cannot open your link.

Look forward to your reply!

Re: How to simulate a tether in an underwater tank

Posted: 26 Aug 2021, 08:46
by coppelia
Hello,

have a look at the demo scene scenes/otherScenes/ropeTest.ttt

Cheers