Large Attenuation Coefficient « k-Wave User Forum

Large Attenuation Coefficient

(2 posts) (2 voices)

ericott25

Member
Joined: May '15
Posts: 2

I am attempting to model propagation of a wave through a highly absorbing material (attenuation coefficient = 32.96 dB/MHz*cm) but when I attempt to do so the simulation domain becomes washed over with extremely high pressure (visible after a few seconds in the simulation window). I've tried adjusting this parameter and it looks like anything above approximately 15 dB/MHz*cm yields this same result. Any thoughts on what might cause this and how to fix it?

Posted 8 years ago #
Bradley Treeby

Developer
Joined: Mar '10
Posts: 1,640

Hi ericott25,

This sounds like a classical instability, and can be fixed by using a smaller time step in your simulation. You can use the function checkStability to tell you the maximum time step for which the simulation will be stable.

Brad.

Posted 8 years ago #

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