How to appropriately simulate the material damping in "Mud"? 回答済み

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Hong-Cin Liou

Hello,

My simulation contains a mud layer (most likely water-based mud) and the most important characteristics/effect of this layer to the ultrasound waves is the energy loss. In other words, I need to input proper damping parameters for this material.

I am wondering if anyone has a similar experience and can provide guidance for a proper approach to simulate the wave behavior in this kind of highly lossy material.

Thanks

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    Chloe Allison
    (編集済み )

    Hi there,

     

    I understand finding the appropriate material damping model for your material can be tricky. I would suggest using vdmp (see command reference) for water-based mud. If you are unsure of the correct properties to use you can do a parametric sweep, varying these properties and seeing which results are most like experiment.

    What application is this for, we might have some examples that may be helpful?

    Best Regards,

    Chloe 

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    Hong-Cin Liou

    Hello Chloe,

    Thanks for your suggestion! This is an application to do NDE in well-drilling, as the liquid may become muddy when the tube goes deep.

    One follow-up question, before you replied, I was trying "rdmp" to set up the material damping, and I found the simulation takes very long compared to those with no damping or "vdmp". Is there any specific reason for this difference?

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    Chloe Allison

    The damping models nwtn, sdmp and rdmp require a smaller timestep than the vdmp model so that is why it takes longer. 

    We have a simulation guide on borehole acoustics that I think may be of interest - https://onscale.com/simulation-guides/sensors/borehole-acoustics/.

    Let me know if there is anything else I can help with.

     

    Best Regards,

    Chloe

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