NewRad: Add simple support for Llama outer boundary
Roland Haas (approved)
Branch: ianhinder/newrad_llama
ianhinder/newrad_llama
Branch: master
master
Merged
#9 · Created  · Last updated
Merged pull request
Merged in ianhinder/newrad_llama (pull request #9)
b4118f8·Author: Ian Hinder·Closed by: Ian Hinder·2017-02-09
Description
This implements the radially outgoing boundary condition on Llama's spherical grid. I (Roland) checked that the expressions agree with what CTGamma implements in its CTGRadiativeBC/src/calc_rhs.h, Ian checked that the physics makes sense.
To use the this the user needs to set the parameter z_is_radial explicitly rather than in CTGamma where CTGRadiativeBC decides this on its own based on its knowledge of Llama's coordinate systems. If one really wanted to risk being clever one could likely try and auto-detect this like so:
This implements the radially outgoing boundary condition on Llama's spherical grid. I (Roland) checked that the expressions agree with what CTGamma implements in its CTGRadiativeBC/src/calc_rhs.h, Ian checked that the physics makes sense.
To use the this the user needs to set the parameter
z_is_radialexplicitly rather than in CTGamma where CTGRadiativeBC decides this on its own based on its knowledge of Llama's coordinate systems. If one really wanted to risk being clever one could likely try and auto-detect this like so:z_is_radial = (r[CCTK_GFINDEX3D(cctkGH, 0,0,1)] != r[CCTK_GFINDEX3D(cctkGH, 0,0,0)]) && (r[CCTK_GFINDEX3D(cctkGH, 0,1,0)] == r[CCTK_GFINDEX3D(cctkGH, 0,0,0)]) && (r[CCTK_GFINDEX3D(cctkGH, 1,0,0)] == r[CCTK_GFINDEX3D(cctkGH, 0,0,0)]);though this is obviously not fully safe as it only tests at a single point.