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Reflection Of Elastic Waves
Posted 25.04.2023, 01:25 GMT-4 Structural & Acoustics, Structural Mechanics, Physics Interfaces Version 6.1 1 Reply
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Hello everyone
I am trying to simulate the wave propagation phenomena in physics of the Solid Mechanic (Elastic Wave) using Time Dependent study.
Linear elastic should be considered as the Material model.
The main challenge is the getting rid of reflecting wave due to impinging the boundaries.
there is some information:
1) PML no effect; it seems it could only be used in the frequency domain.
2) Infinite elements have no effect.
3) Low reflecting BC have some effect. Still, there is reflection, but it is better than PML and infinite elements.
The low-reflecting boundary is ideal only for normal incidence, but it also does a decent job for oblique waves if the angle of incidence is not too large. (By Henrik Sönnerlind)
Can I do this while there is not any reflection?!!!! is there any experience
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No, there is no boundary condition that will result in zero reflection under all circumstances.
You may be able to improve matters by adjusting the longitudinal and transverse velocities in the low-reflecting boundary condition (or by defining a custom boundary load boundary condition). This approach works very well for one angle of incidence.
Otherwise- consider using a sufficiently large domain that reflections do not appear during the time range of interest.