"BHP" stands for "bottom hole pressure" so it sounded logical that
"THP" is an acronym for "top hole pressure". It isn't but the quantity
in question is still the pressure which is seen at the top of the
well's bore hole...
the ones based on Splines are better in principle, but they cause
havoc if two saturations are very close together with the slope of the
values off. this happens e.g. in SWOF in my version of SPE1...
this makes eWoms match autodiff and Eclipse for SPE-1 if the injector
is disabled. with the injector it gets quite a bit closer, but it does
not yet match. (this is probably not a problem with the wells as
autodiff and eWoms agree that the maximum amount of gas should be
injected all the time and these rates are the same...)
ECLiPSE and opm-autodiff seem to be in that range of accuracy, too. At
least the number of Newton iterations per time step now matches that
of autodiff quite well...
this helps to keep the core blackoil model code lean and mean and it
is also less confusing for newbies because the ECL blackoil simulator
is not a "test" anymore.
in case somebody wonders, "ebos" stands for "&eWoms &Black-&Oil
&Simulator". I picked this name because it is short, a syllable, has
not been taken by anything else (as far as I know) and "descriptive"
names are rare for programs anyway: everyone who does not yet know
about 'git' or 'emacs' and tells me that based on their names they
must be a source-code managment system and an editor gets a crate of
beer sponsored by me!
