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underworldcode / UWGeodynamics

Underworld Geodynamics
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Issue with Kinematic boundary conditions #237

Closed Peigen-L closed 3 years ago

Peigen-L commented 3 years ago

Hi, I am trying to build an imposed surface velocity condition of 3.5 cm/year from the trailing edge to a line of 300 km seaward of the trench in the example subduction model. This is the velocity boundary condition I setting:

conditions = [(Model.y < GEO.nd(300* u.kilometre), GEO.nd(0 * u.centimetre/u.year)),
                  (True, GEO.nd(3.5*u.centimetre/u.year))]

function = fn.branching.conditional(conditions)

Model.set_velocityBCs(left   = [0 ,None],
                   right  = [function ,None],
                   bottom = [None, 0.],
                   top    = [None, 0.])

The problem is the result doesn't change compared with the free-slip everywhere condition.

Model.set_velocityBCs(left=[0., None],
                      right=[0., None],
                      bottom=[None, 0.],
                      top=[None, 0.])

Please help