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darcs-hash:20070419015013-dae7b-cd2f28ae5fcd8a3cdcb2822eb0c18d0ffe78bc5f.gz
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Reorganise prolongation and restriction operators. This is a major
implementation change.
Most operators are now written as C++ templates instead of as Fortran
77 code. This simplifies the code, since C++ routines can be called
more easily, and they also have access to CarpetLib's high-level data
structures.
Previously, the operators combined temporal and spatial interpolation.
Now, time interpolation and space interpolation are handled
separately. This may be less efficient, but simplifies the code
significantly, since there are now N+M instead of N*M routines, for N
time interpolation and M space interpolation methods.
Remove the minmod prolongation operator, which was previously
disabled.
Add support for cell centering, using a method described by Simon
Hern, and suggested for Carpet by Ian Hawke.
darcs-hash:20070112205812-dae7b-5329795aa698e7bbc3671b1504134885dd830238.gz
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WENO prolongation should be more accurate than ENO prolongation whilst
retaining the monotonicity properties of the ENO operators. The WENO
operators will only work with prolongation_order_space = 5 because of
the stencil width (requires 3 ghost zones).
darcs-hash:20060310132742-34bfa-32c65e7f67cb91ab36dd125a5327f2e16286e807.gz
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Add a new transport operator type op_copy. This "prolongation"
operator does not interpolate in time, but rather copies the from the
newest time level instead. Such grid functions need only one time
level.
This is intended for prolongating or restricing grid functions like
the ADM constraints; if done properly; they will have the same values
on the coarse and fine grids. (However, this does not work for the
ADM constraints, because such grid functions still need to be set in
EVOL, not in ANALYSIS.)
darcs-hash:20050607160833-891bb-cfd1c7630f8996606328d7c7e9fe326561106aba.gz
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darcs-hash:20050101162121-891bb-ac9d070faecc19f91b4b57389d3507bfc6c6e5ee.gz
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Replace all CVS header tags with the standard "$Header:$".
darcs-hash:20040918132147-891bb-dea889bdd94a479ec412d14d08e9efca63e5c24d.gz
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Essentially Non-Oscillatory prolongation operators. Again intended for
use with things like hydro. As with the minmod operators, there seems
to be small spikes at grid boundaries.
The advantage of these is that they should be smoother than minmod,
fitting the least oscillatory quadratic (switches to linear if best
quadratic not monotone). Massively untested though.
darcs-hash:20040303133040-58737-83b8befb34a91b9d9306beee2cbaea4464eb5b7e.gz
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Import the recently announced changes:
1. Carpet has now an infrastructure for multiple maps (aka "grid
patches"). Instead of a single grid hierarchy there can now be
several. This is largely untested, because the remainder of Cactus
cannot handle multiple coordinate systems.
2. The order in which the schedule bins are called has changed. As Ian
Hawke pointed out, the previous order during time evolution was
inconsistent. The initial data ordering did not allow for recovering
and was not usable for progressively solving elliptic equations for
initial data.
3. Carpet now supports convergence levels. The convergence level
specifies by how many factors of two the resolution in the parameter
file should be coarsened (or refined, if negative). This should make
convergence tests and test runs much easier. It is, in principle, also
possible to run several convergence levels at once. This has not been
tested because the remainder of Cactus cannot handle multiple
resolutions. This will be necessary for a multigrid solver, and also
for having a shadow hierarchy to determine where to refine adaptively.
4. Carpet works together with the new CoordBase domain specification
parameters. Without these, using convergence levels will lead to very
strange results.
5. The "modes" have changed. There are now:
meta mode: the whole simulation
global mode: one convergence level
level mode: one refinement level
singlemap mode: one map on one refinement level
local mode: as previously
The whole mode handling has been cleaned up.
6. The regridding thorn has been cleaned up.
7. The kind of prolongation stencil is now determined in Carpet, i.e. at
a fairly hight level, instead of in CarpetLib.
8. The low-order prolongation operators have been made much more
efficient (as have previously the higher-order ones).
9. Assorted smaller changes.
For Carpet users, there should be no major incompatibilities. The major
improvements are 3 and 4 combined. Here is an example:
CoordBase::domainsize = extent
CoordBase::spacing = gridspacing
CoordBase::zero_origin_x = yes
CoordBase::zero_origin_y = yes
CoordBase::zero_origin_z = yes
CoordBase::xextent = 20.0
CoordBase::yextent = 20.0
CoordBase::zextent = 20.0
CoordBase::dx = 1.0
CoordBase::dy = 1.0
CoordBase::dz = 1.0
CoordBase::boundary_shiftout_x_lower = 1
CoordBase::boundary_shiftout_y_lower = 1
CoordBase::boundary_shiftout_z_lower = 1
Carpet::domain_from_coordbase = yes
Carpet::convergence_level = 0
grid::type = coordbase
grid::domain = octant
grid::avoid_origin = no
This gives you a grid that extends from the origin ("zero_origin") up to
20.0 with a grid spacing of 1.0. Symmetry zones and boundary zones are
added automatically. The "shiftout" says that there is no boundary
point on the origin. The staggering parameters (not shown) default to
"no". In order to change the resolution, only the convergence level
has to be adjusted. Note that the old way of specifying the domain
extent still works.
For Carpet developers, one major change is the new mode handling. As
described in 5, the looping macros (that loop over all refinement
levels, or all components) have changed.
darcs-hash:20040125135727-07bb3-51c9647c1b5080e7e180b52a1b81fa155cfd19e9.gz
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darcs-hash:20010301114010-f6438-12fb8a9ffcc80e86c0a97e37b5b0dae0dbc59b79.gz
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