[Users] interpolation error

[林家暉]

Hello,

I am using IllinoisGRMHD with the test with nsns_test.par in https://bitbucket.org/zach_etienne/wvuthorns_diagnostics/src/master/NSNS_parameter_files/  .

The simulation runs well until t~5300 and an error occurs. The error message is like this:


WARNING level 1 from host nid02210 process 0
  while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET
  in thorn AEILocalInterp, file /global/u1/c/chlin/et/Cactus/arrangements/Numerical/AEILocalInterp/src/Lagrange-tensor-product/../template.c:1109:
  ->
   CCTK_InterpLocalUniform():
        interpolation point is either outside the grid,
        or inside but too close to the grid boundary!
        (this may be caused by a global interpolation with
         driver::ghost_size too small)
        0-origin interpolation point number pt=0 of N_interp_points=1
        interpolation point (x,y,z)=(-157.725,-576.349,-99.2027)
        grid x_min(delta_x)x_max = -576(18)576
        grid y_min(delta_y)y_max = -576(18)54
        grid z_min(delta_z)z_max = -576(18)54

WARNING level 1 from host nid02210 process 0
  while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET
  in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131:
  -> interpolation screwed up
WARNING level 1 from host nid02210 process 1
  while executing schedule bin particle_tracerET, routine particle_tracerET::DoOneRK4StepForParticleTracerET
  in thorn particle_tracerET, file /global/u1/c/chlin/et/Cactus/arrangements/WVUThorns_Diagnostics/particle_tracerET/src/Interpolate_velocities_at_particle_positions.C:131:
  -> interpolation screwed up
srun: error: nid02211: tasks 2-3: Exited with exit code 1
srun: Terminating job step 21753671.0
srun: error: nid02210: tasks 0-1: Exited with exit code 1


I think maybe t can be avoided by decreasing the timestep so that the tracer particle would not move too fast to make the  interpolation screwed up but I am not sure. So what I want to ask is :

  1.  It this error can be avoided by decreasing the timestep ?
  2.  If so, how can I  decrease the timestep in parameter file (or in other places)?


Thank you.
Best regards,
Chia-Hui
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