[CIG-LONG] Low viscosity material around dike

[Walter Landry]

Garrett Ito <gito at hawaii.edu> wrote:
> Hi Taichi,
> 
>   I believe the dike region is staying elevated relative to the material on
> the sides because vy and vz are constrained to be zero in the "dikeShape".  I
> did this in order to cause the divergence to only cause the dike to widen
> sideways (i.e., vx~=0).  Ideally I think you want the dike to be allowed to
> move up or down with the surrounding material but I dont remember figuring out
> a way to allow it to do so.  I think this would require setting dvy/dy=0 but
> not specifying any constraints on vy. 
> 
> Walter, can you see a way to do this?

A divergence zone, by definition, creates material out of thin air.
If material should not be created high up, then there should not be a
divergence zone there.  It might be better to bury the dike.  You
would probably not want to specify vy.  Then material could flow up as
well.

Cheers,
Walter Landry
walter at geodynamics.org