I'm fairly new to OpenFOAM and CFD simulations and I'd like to ask some questions and hope to get some directional advice on how to simulate a setup of multiple propellors.
The idea I'm working on is very basic, 16 rotors are placed in a circle, and drive by an internal motor, and RC controlled. The goal is to see if the whole formation would spin around its axis like a wheel, and move sideways forward through water, like drill.
I have been constructing a mechanical model to figure it out, but recently I've encountered some difficulties and thought of making the switch to a computer simulation. See pictures and clip below to get an idea.
The concept is based on a wild idea of how would physics-particles, such as electrons or photons would move through an Aether (the Vacuum) if they had any structure. More than a year ago I posted some rather na´ve questions of CFD simulations at the speed of light on this forum and got some good advice to try to use Blender 3D.
Now I have tried Blender and even designed the model you can see in the pictures with it, but couldn't find a way to do a simulation with their physics engine, that's why I'm passing by OpenFOAM again to hopefully get some new advice from you experts.
So what I would like to know if its possible to simulate the motion of these propellors in a medium with OpenFOAM, and if it's doable, regarding rendering times, with a 'normal' computer?
Looking forward to hear from you,
A little sketch of the original idea:
The mechanical model in action:
How it's driven by little motors from the inside:
The technical design:
For a CFD simulation a basic setup would be sufficient:
Interesting post. I've formulated an aether based theory for the EM fields:
I think it will not be too difficult to implement this in OpenFoam, but I have to check that out further. I guess it's not too difficult, although we will have to simulate both compressible waves as well as incompressible rotating magnetic fields....
Very complex geometry you have there, but thankfully it can be simplified. Only model one of the rotors in OpenFOAM, then apply a wedge boundary condition to either side of it. That's equivalent to having a ring of them.
I've not worked with a blockmesh that changes over time (aren't there tutorials for this?) nor imported models; someone else will have to help you with that. I'd worry that you might have trouble using both an imported model and modeling motion at the same time. But again.. I have no experience in that regard.
Another possibility is just to focus on an individual rotor. You could model just one bladed section of said rotor as a wedge, have it be static and just give the outer boundary condition as water moving tangentially to it (because a still rotor in swirling water is the same as a swirling blade in still water, right?). You could then print the forces on your rotor to see which way it wants to move.
Thanks for your suggestions, but this is rather an old post (2011) that resurfaced due to a recent comment. In the mean time I have had some help and did the simulations with SPH particles in a simplified version, and it worked. Here's one example:
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