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Predefined rigid body movement in a laminar flow
Posted Jan 9, 2013, 4:21 a.m. EST Version 4.2a 2 Replies
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Hi,
I want to model a predefined rigid body (cross-section of a bridge deck) movement in a laminar fluid flow. The deck should be moved in a harmonic oscillation (heaving or pitching) at a specific amplitude and frequency (after which I want to analyze the forces acting on the deck). My problem is how do I go about achieving this predefined motion? I'm new to COMSOL and I've tried some tutorials and reading topics on this forum.
My first approach was to use the laminar flow physics. But I could not get a moving boundary, do I need to add some physics? Like a moving mesh?
Or should I use the fluid-structure-Interaction module? This seems like a little overkill to me, since I do not want to model a deforming structure...
Or something else?
I would very much appreciate some advise on which approach to take!
Thanks,
Maria
I want to model a predefined rigid body (cross-section of a bridge deck) movement in a laminar fluid flow. The deck should be moved in a harmonic oscillation (heaving or pitching) at a specific amplitude and frequency (after which I want to analyze the forces acting on the deck). My problem is how do I go about achieving this predefined motion? I'm new to COMSOL and I've tried some tutorials and reading topics on this forum.
My first approach was to use the laminar flow physics. But I could not get a moving boundary, do I need to add some physics? Like a moving mesh?
Or should I use the fluid-structure-Interaction module? This seems like a little overkill to me, since I do not want to model a deforming structure...
Or something else?
I would very much appreciate some advise on which approach to take!
Thanks,
Maria
2 Replies Last Post Mar 24, 2014, 10:17 p.m. EDT
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Posted:
1 decade ago
Hi
if I read you correctly your rigid structure does not really deform but it moves in space to change the shape of the fluid volume, if so, for me its typically FSI as your fluid volume changes shape, and in FSI you have all three strucural, CFD and ALE combined in a nicely pre-cooked way
But I do agree its somewhat "heavy", if you do not need the "solid" as such you could try with only the FCD flow and an ALE and prescribe the mesh with the motion of your "rigid bod"
--
Good luck
Ivar
if I read you correctly your rigid structure does not really deform but it moves in space to change the shape of the fluid volume, if so, for me its typically FSI as your fluid volume changes shape, and in FSI you have all three strucural, CFD and ALE combined in a nicely pre-cooked way
But I do agree its somewhat "heavy", if you do not need the "solid" as such you could try with only the FCD flow and an ALE and prescribe the mesh with the motion of your "rigid bod"
--
Good luck
Ivar
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Posted:
1 decade ago
Hi,
I am having the same problem. Could anyone help me please ?
I am having the same problem. Could anyone help me please ?