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Structural Mechanics Error When Making Model Smaller
Posted 25.10.2023, 21:18 GMT-4 Geometry, Structural Mechanics, Physics Interfaces Version 6.1 2 Replies
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Hello,
I am recently starting a project and I wanted to apply the solid mechanic functions with the shell function. I used the block_on_arch file in the COMSOL libraries to understand the functionalities since I am relatively new to structural mechanics.
However, when I attempted to downsize the file from a mm unit to a nm unit, the solver had large errors. I ran the file in mm originally with my desired dimensions and it runs just fine. However, when I change it to nm, it does not produce a result. Is there a measurement in the shell physics, where the error originates from, that I am unaware of? Or is it difficult to apply the same calculations to an extremely small model?
I attached the modified block_on_arch file
Thank you, Zafiro
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There are a number of issues in your example. This list may not be exhaustive:
- Essential nodes in Solid Mechanics are disabled, making the model singular
- The load is 1 exaPa
- The geometry is not the same as in the original, as different scale factors are applied for different geometrical sizes
- The variable scalings under Dependent variables assume original units
- Penalty factor in the Contact node may have to be adjusted
Note that this is a highly nonlinear problem, so you may change its properties fundamentally by changing, for example, aspect ratios.
-------------------Henrik Sönnerlind
COMSOL
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Hello, I apologize for the late response, I took into account what you said and made some changes and I got some simulations working.
Thank you for your feedback!