[Users] boundary conditions with Llama

Haas, Roland rhaas at illinois.edu
Mon Jun 17 20:45:17 CDT 2019

Hello Miguel,

assuming that your outer boundary is spherical, your should set:

NewRad::z_is_radial = "yes"


> hi all,
> i've been implementing a scalar wave evolution code to work with the Llama multipatch 
> infrastructure. i think i have it working except for the boundary conditions. as a first test, i 
> tried to call the NewRad infrastructure, in the same way that i usually do for my non-multipatch codes:
>    ierr = NewRad_Apply(cctkGH, phi, rhs_phi, phi_0, one, n_phi)
>    ierr = NewRad_Apply(cctkGH, Kphi, rhs_Kphi, Kphi_0, one, n_Kphi)
> but this does not seem to work as i get instabilities very early on... am i missing something, or is 
> NewRad not designed to work with Llama? if so, what is the "standard" way of imposing BCs for 
> multipatch evolutions?
> thanks,
> Miguel
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