k-Wave

1. KailingYI
   

   Member
   Joined: Dec '21
   Posts: 6

   Hello,
   The case is that a source with sine wave is in the simulation area, and out of the PML area. At the beginning, while the source is vibrating and the incident wave produced by the source propagated to the edge, there is no any reflection wave; but later, after the source stopped vibrating and all the incident wave propagated to the edge, there is begining to emerge the reflection waves.
   No matter how to increase the number of PML layers and decrease the value of PMLAlpha, the above mentioned phenomena will still appear.
   Is this for any BUGs in k-Wave? and How to repair it?

   Best
   Kailing YI
   2021.12.15

   Posted 2 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Kailing,

   Can I check if you have 'PlotScale', 'auto' set? If so, then the reflected waves are very small, but the auto-scaling makes them seem large. Note, the PML will give you a few decimal points of accuracy, but does not prevent reflections to machine precision.

   If not, you'll have to give a few more details. Note, increasing the value of PMLAlpha is not recommended. Slightly counterintuitively, a higher value does not give better absorption properties, but rather, will give an abrupt change in absorption from which waves can be reflected.

   Brad.

   Posted 2 years ago #

3. KailingYI
   

   Member
   Joined: Dec '21
   Posts: 6

   Hi Bradley,
   Thank you very much!
   I have checked the set 'PlotScale', and it did have setted as 'auto'. Now I set it as [-1, 1], and the reflection waves are not emerging at all.

   Posted 2 years ago #

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