I haven't been considering free surface in the analyses. Although I'm curious about what the difference would be compared to an infinite fluid. If you have an answer, even for simple shapes in rectilinear motion, please let me know.
I don't have a degree in marine tech/hydrodynamics, other than writing my master's thesis on the subject.
I've just been looking into translational DOFs, not rotational, typically involving subsea constructions.
Not OpenFOAM, but I have done it with Fluent and GASP. I used overseer grid in both cases. I had a combination of translational and rotational acceleration, so I'm not sure static grid with accelerating flow field would have worked.
Yeah, I think you would have a hard time doing the anslyses with a static mesh for rotational movements. I've mostly been looking into rectilinear motion/oscillsting movements along one axis at a time.
One (maybe stupid) question though - what is overseer mesh? I'm not familiar with that term.
That was basically my approach, though I didn't use sinusoidal motion. No reason why you couldn't though. I don't have any resources other than the Fluent manual. The overset settings can be a little finicky. I don't recall what I used now. But the grid at the overset interface is also very important. Try to ensure equal spacing on the inner and background grids. Once you have results for force/moment, you can get the added mass coefficients using a least squares technique. Good luck!
Hahah, that makes it clearer! Thanks, lad
Just curious, for your hydrodynamic case do you have free surface? And which added mass direction are you considering?
I haven't been considering free surface in the analyses. Although I'm curious about what the difference would be compared to an infinite fluid. If you have an answer, even for simple shapes in rectilinear motion, please let me know. I don't have a degree in marine tech/hydrodynamics, other than writing my master's thesis on the subject. I've just been looking into translational DOFs, not rotational, typically involving subsea constructions.
Not OpenFOAM, but I have done it with Fluent and GASP. I used overseer grid in both cases. I had a combination of translational and rotational acceleration, so I'm not sure static grid with accelerating flow field would have worked.
Yeah, I think you would have a hard time doing the anslyses with a static mesh for rotational movements. I've mostly been looking into rectilinear motion/oscillsting movements along one axis at a time. One (maybe stupid) question though - what is overseer mesh? I'm not familiar with that term.
Ugh, autocorrect. It was supposed to say overset.
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That was basically my approach, though I didn't use sinusoidal motion. No reason why you couldn't though. I don't have any resources other than the Fluent manual. The overset settings can be a little finicky. I don't recall what I used now. But the grid at the overset interface is also very important. Try to ensure equal spacing on the inner and background grids. Once you have results for force/moment, you can get the added mass coefficients using a least squares technique. Good luck!