[CIG-SHORT] Set shear wave speed to zero

[Brad Aagaard]

Xiao,

PyLith currently only has the ability to solve the elasticity equation, 
not the acoustic wave equation. While Vs=0 can work for dynamic 
problems, it does not work for quasi-static problems, because the 
stiffness matrix has a larger than expected null space. We have not 
tested the code with Vs=0 for dynamic problems, and we currently have 
checks to make sure Vs > 0 in the bulk constitutive models, so the 
answer is no.

Brad


On 06/30/2014 02:49 PM, Ma, Xiao wrote:
> Hi, I am wondering in the material property can we  set the shear
> wave speed to zero in some part of the domain and pressure wave
> equals Vp = 1km/s? In this way we can model water like behavior? Best
> wishes, Xiao
>
>
>
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