How to appropriately simulate the material damping in "Mud"? Answered
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
3 comments
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
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?
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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