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June 18, 2018, 05:15 |
moment of inertia in dynamicMeshDict
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#1 |
Member
Jiadong Wang
Join Date: Mar 2018
Location: Australia
Posts: 32
Rep Power: 8 |
Dear Foamers,
I’m working on the wingMotion tutorial now, and try to input my foil geometry (e.g. NACA0015) and mesh. Does anyone know how to calculate the moment of inertia of a NACA foil in dynamicMeshDict (namely, momentOfInertia)? I’m wondering is there any tool or functionality in OpenFoam to calculate the moment of inertia of geometry. I presuming the momentOfInertia (1.958864357 3.920839234 2.057121362) in dynamicMeshDict means (Ixx, Iyy, Izz). But for a two-dimensional case, the moment of inertia means area or still volume? Any advice and suggestions are appreciated. |
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June 19, 2018, 05:13 |
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#2 |
Senior Member
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Hi,
I would say still volume, as a 2D case in OpenFOAM is 3D, but with "empty" patches in the out-of-plane direction, where you also have 1 cell in thickness in that direction. Regards, Tom |
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June 20, 2018, 00:54 |
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#3 |
Member
Jiadong Wang
Join Date: Mar 2018
Location: Australia
Posts: 32
Rep Power: 8 |
Hi Tom,
I guess you are right. Thank you very much. So, I should input a moment of inertia for the new geometry based on 3D volume. |
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August 18, 2018, 12:09 |
calculation
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#4 |
Member
Fredi Cenci
Join Date: Dec 2016
Posts: 38
Rep Power: 9 |
Hello,
Is this the mass moment of inertia? kg.m^2 Or the area moment of inertia ? m^4 Thank you |
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August 19, 2018, 20:55 |
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#5 |
Member
Jiadong Wang
Join Date: Mar 2018
Location: Australia
Posts: 32
Rep Power: 8 |
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August 19, 2018, 21:34 |
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#6 |
Member
Fredi Cenci
Join Date: Dec 2016
Posts: 38
Rep Power: 9 |
Thank you.
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March 6, 2021, 15:22 |
half geometry
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#7 |
Member
Deutschland
Join Date: Sep 2020
Posts: 69
Rep Power: 6 |
Hey,
I am simulating a ship. Due to symmetry I am only working with half of the geometry. for Dynamic mesh I have following doubts 1. centre of mass - the centre of half or full geometry 2. moment of inertia -moment of inertia of half geometry or (moment of inertia of full geometry)/2 Thanks in advance vava10 |
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dynamicmeshdict, moment of inertia |
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