Pencil Code User Meeting 2007
Nordita Seminar Room
Nordita Building
The Pencil Code is a multipurpose code for massively parallel computing (especially on the cheaper Linux clusters).
It includes optionally hydrodynamics, magnetic fields, radiation, ionization, multi-species dust dynamics with coagulation, and certain reaction-diffusion equations. It is developed and maintained under the Concurrent Versioning System ( CVS ) by around 25 people with check-in permission and has been downloaded by around 400 registered users (without check-in permission).
The code is tested nightly on several platforms and provides an excellent
pedagogical tool for students to implement new code within an organized
framework.
The purpose of the meeting is to bring the core developers together and
to allow others to interact with them and learn more about the code.
How to get here?
(this link has a description and a map). The meeting takes place in the Nordita building,
just next to the AlbaNova building.
The meeting is sponsored jointly by
Nordita
and the
AstroSim
programme.
A full report of the
meeting is available.
Organizers: Axel Brandenburg, Boris Dintrans, Wolfgang Dobler, Anders Johansen, Petri Käpylä
All presentations are recorded on video; see link to the
video page of Alex Agapow.
There is also a link to
streaming videos.
List of discussion topics:
Admin:
Changing from CVS to another Versioning System **
GPL agreement, going to version 3 **
Multiauthor paper discussing methods and tests?
good illustrative problems? (e.g. source terms)
Do we need a better tracker against breaks of the auto-test?
pencil_consistency_check: possible overcalculation... pencil del2a (17) **
Suggestion: switch off by default, on nightly test machines activate
through global options file:
- pencil_consistency_check
- color output
Strange comments such as "life_support_off?" **
WARNING: death on error restored occurred at life_support_off
[Write Bugzilla report, assign to Anders]
Configuration based on machine multiple names **
Host name could be set in global .pencil/ directory.
Clean-up:
A clean up of the IDL directory? **
Make obsolete directory in $PENCIL_HOME/idl and move all files there.
Make descriptive subdirectories of $PENCIL_HOME/idl and move useful files
there.
Suggested subroutines read, write, plot, calc.
State of the manual. What needs to be done?
more about boundary conditions (to be done) **
Manual and Wiki: wiki for not so well established stuff **
Suggestion: add more formulas (derivations and ``how do we get there'')
Suggestion: equation of state should come before passive scalar, etc.
Technical additions:
Spherical and cylindrical coordinates
Upwinding stuff in non-cartesian coordinates: **
Suggestion: treat partial derivative with upwinding
Non-reflecting open b.c.s (Wolfgang) **
Density floors and ceilings
Radiation transport in shearing boxes
The shock viscosity (Tobi and Anders)
Isolated boundary conditions (Chao-Chin Yang)
James, R.A. 1977, J. Comp. Phys. 25, 71-92.
Next meeting? Where? Elsewhere than Stockholm? How to do it differently?
Tentative time: 26-29 Aug 2008.
Yes. Possibly Leiden.
Talks
Tuesday, 9-10:30, 11-12:30
9:00 Axel Brandenburg Introduction
9:15 Anders Johansen Dust in self gravitating shearing sheets
Cristina Green Traveling waves in sheared convection
Discussion
Tuesday, 14-15:30, 16-17:30
Wolfgang Dobler CVS, Mercurial or Subversion -- do we need a
Sven Bingert Field aligned heat conduction in the corona
Marcus Gellert Hydrodynamic simulations in cylindrical coordinates
Discussion
Wednesday, 9-10:30, 11-12:30
Miikka Väisälä Formation of elephant trunks
Tobias Heinemann Migrating to subversion
Discussion
Wednesday, 9-10:30, 11-12:30
Steve Berukoff Plans to implement protostellar disc chemistry
Chao-Chin Yang Fueling the circumnuclear region of a barred galaxy
Discussion
Wednesday, 14-15:30, 16-17:30
Petri Käpylä Hi-res MHD on the Finnish Louhi machine
Anne Liljeström Reynold stresses in shearing boxes
Discussion
Thursday, 9-10:30, 11-12:30
Dhrubaditya Mitra Simulations in spherical coordinates
Nathalie Toque Turbulent diffusion
Boris Dintrans I. Global convection; II. Implicit method
Discussion
Thursday, 14-15:30, 16-17:30
Wladimir Lyra Global disc simulations
Lars Mattsson Disc Simulations: Evolving Late-type Galaxies
Mikaela Sundberg Code comparison projects - A sociological view
Discussion
Friday, 9-10:30, 11-12:30
Wolfgang Dobler Multigrid solvers for the Pencil Code
different Version Control System (Discussion)
Friday, 14-15:30
Axel Brandenburg Parallelization in the x-direction (link)
Discussion
