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October 9, 2024, 13:28 |
For Validation
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#1 |
New Member
Dilip
Join Date: Sep 2024
Posts: 8
Rep Power: 2 |
I need to validate one case and i am having problem to set up a given equation . like in which openfoam file i can find nonlinear damping and cubic term. i am using simpletic solver for my case related to flow induced heaving and pitching any idea or help would be really appreciated.
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October 10, 2024, 07:12 |
Bit more background needed
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#2 |
New Member
Skill-Lync CFD
Join Date: Sep 2024
Location: Chennai
Posts: 21
Rep Power: 2 |
Can you explain the physics a little bit? It would help in narrowing down the terms you would need to focus on.
Also, please mention the OpenFOAM version you are using. Regards Team Skill-Lync |
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October 10, 2024, 10:22 |
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#3 |
New Member
Dilip
Join Date: Sep 2024
Posts: 8
Rep Power: 2 |
I'm working on validating a NACA 0012 airfoil and need to simulate flow-induced heaving and pitching. The equations in my reference paper include both linear and non-linear terms. My question is where to implement the non-linear terms in OpenFOAM. I understand that the 6DOF solid body framework has solvers and folders for constraints and restraints. In my case, I have a linear and angular spring with no damper, but the equations include non-linear terms in the stiffness (K) component. Where should I incorporate these non-linear and coupling terms?
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October 14, 2024, 04:28 |
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#4 |
New Member
Skill-Lync CFD
Join Date: Sep 2024
Location: Chennai
Posts: 21
Rep Power: 2 |
The 6DOF solver can take a text file input with time vs location. If you are interested, you could give the motion of your airfoil as a tabulated input to your dynamicMeshDict file.
Instead, OpenFOAM foundation uses #calc function where you can directly input your motion with respect to time, while defining the X, Y and Z coordinates of your object. If you want to incorporate the equations for motion of your object, these are two ways in which you could do it. I would advise start with the tabulated 6DOF, it's relatively easier as all it would take you is a simple Python script to write the text file. |
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October 14, 2024, 11:16 |
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#5 |
New Member
Dilip
Join Date: Sep 2024
Posts: 8
Rep Power: 2 |
can you share more details how to put #calc in dynamicMeshDictFile. my equations has non linear terms as well and i have to find pitching and heaving motion. equations are attached
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October 25, 2024, 14:54 |
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#6 |
New Member
Dilip
Join Date: Sep 2024
Posts: 8
Rep Power: 2 |
In my study of vortex-induced vibrations (VIV) for a vibrating cylinder, I have a mass ratio m* is 10 Re = 100 and Ur* from 4 to 8. I am trying to determine which parameters to adjust in order to achieve different amplitudes of vibration for the cylinder at these various reduced velocities. However, I am encountering an issue where I observe the same amplitude at each reduced velocity, regardless of the changes I make. Can someone explain why this might be happening? I appreciate any insights, as I am conducting this analysis using OpenFOAM.
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