Effective Absorbing boundary for Guided Wave simulations 回答済み

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• 正式なコメント

  

  Chloe Allison

  2020年09月15日 13:25

  Hi Robin,

   

  We are unable to access the link above.

   

  Best Regards,

  Chloe

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• 

  Robin James

  2020年09月15日 17:40 (編集済み 2020年09月15日 17:41)

  Hello Chloe,

  Please use this link instead:

  https://drive.google.com/drive/folders/1aCutw5NYQZsoe61PgwZsOpTovA-JRWei?usp=sharing

  Thanks

  Robin

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• 

  Oliver Mashari

  2020年09月16日 10:15 (編集済み 2020年09月16日 10:16)

  Hi Robin,

  You haven't placed the absorbing boundary conditiions on the boundary of the model. For example on the XMAX side you have defined a surface node $indgrd-1 $indgrd-1 $j1 $jndgrd-1 $k2 $kndgrd-1 is there a reason why you are defining the BCs like this? I don't understand why you have this area of void elements around the IM7_90deg. You could get the same result by removing this area of void elements and placin the absorbers directly on the surfcae using:

  BOUN SIDE YMAX ABSR

  Absorbing boundary conditions aren't perfect it will look there are reflections in the runtime graphics. What I could suggest is placing a time history near the boundary and run 1 simulation with absorbing BCs and the other without and compare the signals.

  Regards,

  Oliver

   

   

   

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• 

  Robin James

  2020年09月21日 00:17

  Hello Oliver,

  I have updated the gdrive link.

  https://drive.google.com/drive/folders/1aCutw5NYQZsoe61PgwZsOpTovA-JRWei?usp=sharing

  This link has files and results for 2 scenarios: free boundaries at xmin, ymax and xmax; and absr boundaries at xmin, xmax and ymax.

  From both the results I saw that the signals had a higher amplitude close to the boundary for the case of the free boundaries compared to the absr boundaries.

  I cannot seem to see reflections if I look at the displacement waveforms, but I see the reflections in the snapshot video. Why do these reflections show up if they are not there in the time domain signals? Also is there a way that these reflections don't appear in the runtime graphics or snapshot video?

  Thanks for your help!

  Robin

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• 

  Oliver Mashari

  2020年09月24日 11:03

  Hi Robin,

  I can see from the files/images that you are using the rang option. Absorbing BC aren't perfect, all I can really suggest is ranging the data till it looks acceptable.

  Oliver

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• 

  Robin James

  2020年09月25日 04:28

  Hello Oliver,

  Thanks for your suggestion.

  In order to see more effectiveness in absorbing the boundary reflections. I tried to implement a non-reflective boundary method that we model in ANSYS and tried to model it in OnScale using line kelv and line visc elements but I received some errors and created a forum topic for it as well. Could you please assist me with that as well? The link is given below:

  https://support.onscale.com/hc/en-us/community/posts/360013184317-Error-occurred-in-subroutine-extdta-Error-message-length-less-than-0-data

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