Boundary condition error Answered

I wanted to make my boundary conditions xmin, xmax and ymin all absorbing with ymax being fixed however, whenever i set xmin to absr it comes up with the following error.

****Error occurred in subroutine pcsabs **** ****Error message--bad area on absr, ijk range:(1,1,1)(2,2,1)


All other boundary conditions work except when absr is assigned to xmin.

6 comments

  • Official comment

    Hi Hannah,

     

    Can I ask what material's are in contact with xmin?

     

    Best Regards,

    Chloe.

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  • Hi Chloe, 

    Xmin is in contact with urethane, water, brain tissue and glass (see attached image). I thought perhaps urethane may not allow for an absr condition so tried changing the model to have an area of water surrounding the urethane but came to the same problem.

    Both xmin and xmax are in contact with the same materials, which is why it seems odd that it allows xmax to have an absorbing boundary condition but not xmin. 

     

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  • Hi Hannah,

     

    Can you try commenting out the BrainScatter material. It could be that a tiny BrainScatter element is in contact with xmin causing the error.

     

    Best regards,

    Chloe.

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  • Hi Chloe, 

    Even when commenting out the Scatterers, the same error appears.

     

    Hannah 

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  • Hi Hannah,

    I saw that you sent your files into support so I had a look. The issue is that you are setting your model to be axi-symmetric in y meaning your xmin condition cannot be absorbing. If you change the model to plain strain it will work.

    If you want the above model to be axi-symmetric in y, you must model half of it and apply a symm condition to xmin so that the revolution around y gives you the 3D cylindrical version of the 2D model. If the brain scattering is not symmetric you might want to model in full 3D. But if you are just wishing to get some 2D results, just remove the 'axiy' in line 64.

    Best regards,

    Chloe.

     

     

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  • Hi Chloe, 

     

    This worked perfectly thank you so much!!

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