Error - Line element stiffness is zero 回答済み

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• 正式なコメント

  

  Chloe Allison

  2020年09月01日 11:03

  Hi Robin,

   

  It appears you have defaulted the mass and vmax in the prop command but the command reference specifies that there is no default. Check the command reference but I would recommend inputting all params to be safe.

   

  Best Regards,

  Chloe

   

   

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• 

  Robin James

  2020年09月01日 14:08 (編集済み 2020年09月01日 17:51)

  Thank you for your response.

  It is a massless spring. Could I input the "m" as 0.0 ? I could input vmax as the maximum longitudinal velocity of the model.

  Also, I have not used the " line gcon " command. Is this command necessary to have for line elements?

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• 

  Chloe Allison

  2020年09月09日 09:40

  Hi Robin,

  Yes you should be able to enter 0 mass and the longitudinal velocity of the spring.

  Line gcon is only required if you are using an unstructured grid, I am assuming you are working with structured elements?

   

  Best Regards,

  Chloe

   

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• 

  Robin James

  2020年09月09日 11:51 (編集済み 2020年09月09日 11:52)

  Hello Chloe,

  Yes I am using structured mesh.

  After I input the mass as 0.0, I get the error "line element is on a massless node".

  Also I want the k value to be 0 as well for all line elements that I am constructing. When I do this I get the error "Line element stiffness is 0".

  Also, what are the units of k, c and vmax?

  Thanks
  Robin

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• 

  Robin James

  2020年09月11日 14:13

  Thanks Chloe, for clarifying the units of "c" in a different post(https://support.onscale.com/hc/en-us/community/posts/360013124517-Line-element-with-linear-viscous-model).

  Please let me know what are the units of k and vmax.

  Also please address the 2 errors I get in the top. The input file and necessary support files are provided in the Google drive link in the original post.

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• 

  Chloe Allison

  2020年09月14日 07:38

  Hi Robin,

   

  In SI units the spring constant,k, has units of N/m and the viscous constant, c, has units of N.s/m. Vmax is a velocity in m/s.

  The command must need a non-zero value for mass and k. Does the script work for small values input?

   

  Best Regards,

  Chloe

   

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• 

  Robin James

  2020年09月14日 17:29 (編集済み 2020年09月14日 17:29)

  Yes, if I add some small mass value like m = 0.000001 and k = 0.00001 or just use the visc model where there is no k but give small value of mass then it does seem to work but still gives an error. Please see this post:

  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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