k-Wave

1. ZHANG Fan
   

   Member
   Joined: Oct '16
   Posts: 9

   Hi everyone,

   For PS or k-space methods, the computation of the spatial derivatives via the FFT causes waves leaving one side of the domain to reappear at the opposite side. This wave wrapping can be avoided by implementing an absorbing boundary condition known as a perfectly matched layer.

   I did observed this phenomenon called 'wave wrapping', but I can't understand how FFT causes it. Could anyone help explain it? Thanks in advance.

   Best,
   Fan

   Posted 7 years ago #

2. g.schober@skz.de
   

   Member
   Joined: Mar '17
   Posts: 7

   Hi Fan,

   the 'wave wrapping' happens due to the fact that the FFT needs peridiocity from the subject that is computed. So one of the edges is connected to the other one on the other end and the same is to say for every other edge.

   Best regards
   Laurent

   Posted 7 years ago #

3. ZHANG Fan
   

   Member
   Joined: Oct '16
   Posts: 9

   Hi Laurent,

   I understand now. Thank you very much for your help!

   Best,
   Fan

   Posted 7 years ago #

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