Omission of key primitive element in my model 回答済み

 I am currently running a simulation to investigate the attenuation caused by a tube made up of a glass material (SiO2) when placed at a focus of HIFU transducers. 
I was able to simulate the model without the glass tube to obtain the pressure without the glass however, the story was not the same when I did with the glass tube placed in it. My surprised was that the model did not recognize the presence of the tube even when it was clearly assigned in the mole. The onscale omits the glass tube from the model each time it is run making the result to look the same as that without the glass tube. Any help please?


  • 正式なコメント

    Hi Lukman, 

    There are a couple of reasons why the tube might not be showing up in the model. Here are some tips to try:

    Co-ordinate definition is in the wrong order – Primitives are defined using beginning and ending co-ordinates. These must be in the correct order. The beginning co-ordinate (e.g. X Begin, Y Begin, Z Begin) must be the smallest co-ordinate value for that shape and the ending co-ordinate (e.g. X End, Y End, Z End) must be the largest co-ordinate value. Be careful here, order dependence matters!

    Coarse Meshing – If your meshing is too coarse e.g. your element size is larger than a part in your model, that part cannot be meshed and therefore won’t be represented.To check that your meshing is fine enough to realize your whole geometry, you can inspect the mesh by going to Model Graphics > Show Approx. Meshing.

    Incorrect precedence – Each part in your model has a precedence defined in its Properties. If parts have materials that overlap, the material in that area will be the part with the highest precedence.

    I hope this helps!

    Best Regards,


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  • Hi Chloe,

    Thanks so much, the problem is solved. However, when I ran the model, the glass tube was present but what can I do to see the standing wave in the glass tube? The present result does not show any information of the standing wave. Is it because of the absr that was used as the boundary condition?

    Please I need your expert suggestion here

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  • Hi Lukman,

    It is hard to comment without being able to see the model but a couple of things to try:

    • Use free boundaries instead of absorbing
    • Place a time history within the tube material and see if there is any signal on the output
    • Check material of tube to ensure that the properties are set up correctly.

    I hope this helps.


    Best Regards,


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  • Hi Chloe,

    Thank you so much, I will give it a trial and get back to you.

    Thanks once again

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