def compute(self, grid, Mz, coarsening_factor):
tauc = PISM.IceModelVec2S(grid, "tauc", PISM.WITHOUT_GHOSTS)
tauc.set(0.0)
enthalpy = PISM.IceModelVec3(grid, "enthalpy", PISM.WITHOUT_GHOSTS,
grid.z())
enthalpy.set(0.0)
model = PISM.BlatterTestHalfar(grid, Mz, coarsening_factor)
geometry = PISM.Geometry(grid)
with PISM.vec.Access(geometry.ice_thickness):
for (i, j) in grid.points():
geometry.ice_thickness[i, j] = model.H_exact(grid.x(i))
geometry.bed_elevation.set(0.0)
geometry.sea_level_elevation.set(0)
geometry.ensure_consistency(0.0)
model.init()
inputs = PISM.StressBalanceInputs()
inputs.geometry = geometry
inputs.basal_yield_stress = tauc
inputs.enthalpy = enthalpy
model.update(inputs, True)
return model
