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nonlinear wave propagation

Posted Oct 1, 2021, 9:40 a.m. EDT General, Acoustics & Vibrations, Structural Mechanics Version 5.6 1 Reply

王 猛
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Hello,

I am making 2D Lamb wave propagation in hyperelastic materials with Muraghan Third Order Elastic constants, I have a impulse function as input BCs, but when I use transient study it always can not run (the last step can not converge), however, if I select linear elastic material rather than hyperelastic, it can run anyway, is there some part I should change the settings ?

Thanks.

1 Reply Last Post Oct 2, 2021, 12:53 p.m. EDT
Dave Greve
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Posted: 3 years ago Oct 2, 2021, 12:53 p.m. EDT

A source approximating an impulse function PLUS nonlinearity is pretty much a worst case for convergence in a time-dependent solution.

You could try making the "impulse" more gradual, say a half sine wave. And try decreasing the amplitude until you get convergence. Maybe you can get a useful solution that way.

Sometimes using different solvers will help. For (linear) wave propagation problems I use BDF, strict, max order 2, min order 1.

A source approximating an impulse function PLUS nonlinearity is pretty much a worst case for convergence in a time-dependent solution. You could try making the "impulse" more gradual, say a half sine wave. And try decreasing the amplitude until you get convergence. Maybe you can get a useful solution that way. Sometimes using different solvers will help. For (linear) wave propagation problems I use BDF, strict, max order 2, min order 1.

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