The code is attached in case anyone wants to take a look, I will try the high frequency scenario later.
On Mon, Oct 8, 2018 at 7:58 PM Mark Adams <mfad...@lbl.gov> wrote: > > > On Mon, Oct 8, 2018 at 6:58 PM Weizhuo Wang <weizh...@illinois.edu> wrote: > >> The first plot is the norm with the flag -pc_type lu with respect to >> number of grids in one axis (n), and the second plot is the norm without >> the flag -pc_type lu. >> > > So you are using the default PC w/o LU. The default is ILU. This will > reduce high frequency effectively but is not effective on the low frequency > error. Don't expect your algebraic error reduction to be at the same scale > as the residual reduction (what KSP measures). > > >> -- Wang Weizhuo
makefile
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Helmholtz_demoV2C.cpp
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