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July 18, 2023, 06:30 |
Prescribed motion for rigid body possible?
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#1 |
New Member
Lydia Schulze
Join Date: Jan 2012
Location: Karlsruhe, Germany
Posts: 20
Rep Power: 14 |
Hello REEF3D modeller,
I'm trying to simulate a lock filling process with floating ship with REEF3D. For that need a large upstream channel with higher water level, a lock with floating box (=ship) with lower water level. In between there should be a solid box (=gate) that has to move with prescribed motion. I added a little sketch for easier understanding =>plan view How can I insert the gate.stl as rigid body and define a motion in z-direction? Any hints are highly appreciated! Best regards Lydia P.S. My current state: a simple box with floating ship and two waterlevels is running successfully. Next step: rigid gate with prescribed motion. Then: open upstream channel with fixed upstream water level. Final aim: Rigid gate with two smaller valves opened with prescribed motion to fill the lock. |
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July 19, 2023, 04:20 |
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#2 |
Member
Felix S.
Join Date: Feb 2021
Location: Germany, Braunschweig
Posts: 88
Rep Power: 6 |
Hey there,
as asked in many threads (e.g. here) REEF3D so far cannot simulate multiple independent floating bodies. As the 6DOF solver is also the only way for prescribed motion of solid bodies(X 210 and X 211), what you want to accomplish is so not yet possible with the 6DOF solver. From here I am just guessing what could work in the framework of REEF3D, but I have not yet tried such approaches. Maybe someone else has other creative ideas as well .
Last edited by Felix_Sp; July 19, 2023 at 06:58. |
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July 19, 2023, 06:56 |
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#3 |
New Member
Lydia Schulze
Join Date: Jan 2012
Location: Karlsruhe, Germany
Posts: 20
Rep Power: 14 |
Hi Felix,
hi there, thanks for your reply! I'm a newbie with REEF3D and your comments and ideas are very helpful for me. If there are further ideas how to solve my lock filling problem, they are very welcome! Usually, I use OpenFOAM for modelling but the meshing concept with structured grid and level-set geometry representation in REEF3D and the open source concept seem worth testing cases, that are difficult with OpenFOAM's body-adapted unstructured grids. Also very interesting are the sediment/scour simulation options. They are also on my testing list. So I might be back here soon, sharing questions and experiences. Regards Lydia |
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July 19, 2023, 07:34 |
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#4 |
Member
Felix S.
Join Date: Feb 2021
Location: Germany, Braunschweig
Posts: 88
Rep Power: 6 |
Hey Lydia,
REEF3D is a cool toolbox from my perspective. However, it is still a little rough around some edges, as it is younger than OpenFOAM and has yet a smaller community which helps debugging. In regard to OpenFOAM: A colleague of mine did some heave decay tests with overset meshes, but I have no experience with that. As I only have experience with more "static" cases in OpenFOAM, I cannot really say how good this approach works. If you are testing open source toolboxes and have access to a good GPU, you might also take a look at DualSPHysics. An SPH method is obviously different from the mesh based approaches. However, they have implemented as many floating bodies as you want. Your problem should be reproducible in DualSPHysics. The problem with SPH is obviously whether you can actually compute it with high enough accuracy, as the method is yet quite expensive in regard to computing power. Felix |
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July 23, 2023, 18:44 |
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#5 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Hi Lydia,
as Felix mentioned, multiple floating bodies with prescribed motion are not supported at the moment. What is your timeframe for your simulations? I have motion file support for 6DOF on my ToDo list, I will have a look at how this can be extended to multi-body. |
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August 21, 2023, 14:38 |
Rigid motion for single body
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#6 |
New Member
Kevin McTaggart
Join Date: May 2018
Posts: 15
Rep Power: 8 |
Hello Hans. Do you know when rigid motion for a single body might be implemented? Thank you.
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Tags |
lock filling, prescribed motion, rigid body |
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