Breaking news about Whisky
Last updated: 12th of January 2010
- The thorns EOS_Polytrope and EOS_Hybrid moved to
- A new public version saw the light of the day. This time, this includes some
changes to the core part, which are likely to require changes in both, private
thorns and parameter files. Here is a list of what you likely have to do
after an update:
- In general:
- Whisky now uses TmunuBase and HydroBase
(both from the CactusEinstein arrangement)
- Whisky and HydroBase now use one variable group for each
primitive and conserved variable, which means
whisky_(prim|cons)_(scalar|vector)_var has to be
replaced by the corresponding variable names
- The following table summarizes changes in names and location of
- For parameter files:
- Add the thorns TmunuBase and HydroBase to
the list of active thorns (both from CactusEinstein).
- Depending on your needs, add options for Tmunubase, e.g.:
TmunuBase::stress_energy_storage = yes
TmunuBase::stress_energy_at_RHS = yes
TmunuBase::timelevels = 1
TmunuBase::prolongation_type = none
- The same goes for HydroBase, e.g.:
HydroBase::timelevels = 3
HydroBase::evolution_method = "whisky"
- Look for use of old variable names and change them, e.g. in I/O parameters
- For thorns:
- Inherit from HydroBase or Whisky, being FRIEND to anything should not be necessary anymore
- Look for use of old variable names and change them. Vector GFs are not yet nicely
supported by Cactus, especially not for C/C++. You may want to have a look at
Whisky_TOVSolverC/src/tov.c how the convertion can be done easily (but ugly
for the moment)
- All the webpages have been updated and broken links have been fixed
- The webpages have gone through a bit of cleaning
- The Whisky Retreat IV was held
- We now have a mailinglist for questions/answers/announcements/discussions:
- We now have a mailinglist for questions/answers/announcements/discussions
only among the developers:
- The Whisky Retreat III
is coming up, please register.
- Pictures from the conference call at the beginning of May are in
can be found here.
Pictures from the conference call at the end of February are in
can be found here.
Lots of Whisky talks at the
A new TOV solver thorn,
has been added to the repository. Written by Frank Löffler,
it can do multiple boosted glued stars. Some binary NS simulations
were performed that looked pretty good, but the system is totally
Using the new version of MoL plus modified versions of BSSN and
Whisky, a stellar collapse run was performed using
Carpet. Although spherically symmetric it was run without any
symmetries and still managed to resolve the bounce and resulting
Pictures from the conference call at the end of November
can be found here.
Pictures of the latest tests
can be found here.
A new thorn,
is added to the repository. This is a simple initial value problem
solver using BAM written by Frank Löffler, Ian Hawke and Luca
Joachim Frieben adds the analytic calculation of the left
eigenvectors to the Roe and Marquina Riemann solvers. The compact
flux formula for the Roe and Marquina solversare also added. This
leads to considerable gains in efficiency.
Whisky is altered to work with the new CactusEinstein arrangement
(ADMBase and others). Auxilliary is replaced with ADMCoupling, and
we no longer require a separate ADMConstraints thorn.
Whisky passes TOV and migration tests, thanks to work by Luca
See the pictures here.
The Einstein thorn in the development Cactus distribution now
includes timelevel support. This, combined with a few minor
changes to Whisky and BSSN_MoL (no functionality changes) mean
that we no longer need the branched version of Einstein.
IMPORTANT: You will need to update a number of thorns for this to
work. It would be safest to run
from your base Cactus directory to ensure that everything is
updated. If this gives problems then the most important things to
update are the flesh, PUGH, BSSN_MoL, MoL, Whisky and
The minor changes to thornlists and parameter files should be
given by the examples on the
For the moment, the branched ADMConstraints thorn will remain, as will the (misspelt) Auxilliary thorn.
ENO reconstruction added. This is arbitrary order, but the stencil
width must be at least the order. Largely untested. Higher than
second order gives poor results (slightly oscillatory) if
reconstructing on the conserved variables.
A few changes to MoL to remove warning messages on the Origin. No
changes to functionality.
Convergence tests of rotating stars seem to confirm second order
convergence (TVD, Marquina, ICN). This is with the fully
dynamical spacetime (static shift). This is slightly iffy due to
the avoid origin problem, and these runs were performed without
the constraints being output.
Convergence tests of TOV stars confirm second order convergence
using ICN or RK3 time evolution and either TVD or PPM
reconstruction. RK2 give second order convergence in the Cowling
approximation but not with a dynamical spacetime, reason
Parameters added so that initial data can be specified just for
the hydro. This allows Scott to do the shock tube on curved
spacetime test, and Pedro the torus and Schwarzschild, and...
Auxilliary thorn and branched ADMConstraints thorn added to
EUHydro. Both will be merged straight back into CactusEinstein
soon. Allows for standard constraint checking.
EOS_Polytrope thorn added and additional EOS parameters and code
to deal with polytropes. This probably isn't the most efficient
way of implementing a polytropic EOS in Whisky, but it seems to
BSSN_MoL will now do everything that ADM_BSSN would do, plus it
couples to Whisky.