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Cell Periodicity Equation

Posted 25.05.2020, 15:20 GMT-4 Structural & Acoustics Version 5.5 1 Reply

Simon Moser
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Hi everyone, I'd like to use the cell periodicity boundary condition for my problem, but I have some issues understanding the equation and unfortunately, it is not specified in the User's manual:

u_dst = u_src + e_avg * (r_dst - r_src)

The first part is clear, but what does the second part after the plus sign stand for. I think, it must be about preventing rigid body motion, but I don't understand, what e_avg stands for. Does anyone know, what e_avg stands for here?

Thanks Simon

1 Reply Last Post 25.05.2020, 15:34 GMT-4
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago 25.05.2020, 15:34 GMT-4

Hi,

It is the average strain. Short version: Displacement on one side equals displacement on other side + strain*distance.

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Henrik Sönnerlind
COMSOL
Hi, It is the average strain. Short version: Displacement on one side equals displacement on other side + strain\*distance.

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