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Coordinate Dependant Variables and Deformation
Posted 2020年3月9日 GMT-4 12:22 Structural & Acoustics, Fluid & Heat, Parameters, Variables, & Functions Version 5.4 3 Replies
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Hi there. I've had a bit of a look around and I couldn't find an answer to a relatively simple underlying part of COMSOL's variables.
If I define a load (in this case a volume force) on a mesh element/node using a coordinate dependant variable will that load be updated as the mesh deforms? I.e after a step in the solution will the load be updated using the new coordinates of the mesh element/node it is acting on?
Thanks for taking the time to read,
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Thomas,
You must use a moving mesh to achieve that.
Cheers Edgar
-------------------Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
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If you write a coordinate with uppercase letters (X,Y,Z), it is in material frame (original coordinates). If you use lowercase (x,y,z) it is in spatial frame (room fixed coordinates).
If you use geometric nonlinearity (for structural mechanics) or a moving mesh, then the frames will differ, and this convention becomes important.
Say that you have an edge originally located at 0\<x\<1, and apply two loads to it: 3*X and 5*x.
Now the edge is translated to 1\<x\<2. The first load still varies from 0 to 3, while the second one now varies from 5 to 10.
-------------------Henrik Sönnerlind
COMSOL
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Thank you for helping me out with that. I will try and implement it soon. Fingers crossed it goes smoothly and I can move onto the next stage of my project.