[Nek5000-users] Problem size requires AMG solver

[nek5000-users at lists.mcs.anl.gov]

Hi everyone,

I need to run a case in Nek with a large number of elements (~ 1 million).

The same problem with a small number of elements works fine, but on the larger grid
the solver exits with the following error:

    EXIT: Problem size requires AMG solver          1

Going through the code

# if (imode.eq.0 .and. nelgt.gt.350000) call exitti(
#   $ 'Problem size requires AMG solver$',1)

It seems that over 350000 elements, you need to use the AMG solver.
Is that correct? Or is there any workaround to not use the AMG.

Kind regards,
Dante De Santis

Research Consultant Computational Physics 4 Solutions
[NRG - Research and Innovation Unit]

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phone: +31(0) 224 56 4656
e-mail: desantis at nrg.eu<mailto:desantis at nrg.eu>
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