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computation per timestep https://galprop.stanford.edu/forum/viewtopic.php?f=3&t=253 
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Author:  lw840305 [ Wed Apr 10, 2019 2:10 am ] 
Post subject:  computation per timestep 
Dear all, When I read propel.cc source file, I find when calculating the timedependent propagation equation, for each time step, the computation would repeat 20 times, i.e. timestep_repeat = 20. I think the wellknown CrankNicolson theme is unconditionally stable. Why does the computation repeat 20 times ? Thank you very much for your reply. 
Author:  gudlaugu [ Thu Nov 28, 2019 2:16 am ] 
Post subject:  Re: computation per timestep 
Sorry for the late reply. The code is meant to repeat until a steady state solution at each timestep. Hence we need several iterations at each timestep. 
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