Re: [Users] MPI killing issue

On 23 Dec 2020, at 13:30, Roland Haas <rhaas@illinois.edumailto:rhaas@illinois.edu> wrote:

Hello Karima,

I am not a black hole evolution expert, but I can give this a try.

Hi,

I use the parameter

TwoPunctures::TP_epsilon = 1e-6

to ensure that the NaN never appears, no matter where I place the BHs. This replaces a denominator

sqrt (pow (r2_plus, 2))

with

sqrt (pow (r2_plus, 2) + pow (TP_epsilon, 4))

See

https://bitbucket.org/einsteintoolkit/einsteininitialdata/src/master/TwoPunc...

so adds a fixed source of error to your evolution, but the effect of this is negligible.

-- Ian Hinder Research Software Engineer University of Manchester, UK