[CIG-MC] CitcomS 3.0.0 releas

[Eh Tan]

CIG is pleased to announce release of CitcomS 3.0.0. CitcomS is a finite
element code designed to solve thermo-chemical convection problems
relevant to Earth's mantle.

This release of CitcomS contains many new features, including:
• two implementations of compressible convection, one by Wei Leng and
Shijie Zhong and the other by Eh Tan;

• the ability to resume computation from previous checkpoints;

• multi-component chemical convection;

• a fixed non-Newtonian solver;

• an exchanger package for solver coupling;

• removing the rigid body rotation component from the velocity by Shijie
Zhong;

• an option to disable monitoring of maximum temperature;

• a rheology option for pseudo-plasiticity, composition dependent
viscosity and heat generation, compressed ASCII output, and an easier
way for mesh refinement for the radial coordinate by Thorsten Becker.



There are also seven backward-incompatible changes. Among them, the
first four will affect the results, the rest only affect the input file.
The changes include:
• the viscosity field at element level is not smoothed (this might slow
down the convergence but will represent the viscosity field more
accurately);

• the Lenardic filter on temperature is disabled by default;

• the rigid body rotation component is removed from the velocity by default;

• use of a better pseudo-random number generator to generate the initial
tracer;

• the type of input parameter coor is changed from a boolean to an integer;

• setting restart=on will resume the computation from the checkpoint
files and will not need the tracer files (the old way of reading initial
temperature from velo files can be achieved by tic_method=-1);

• the input parameter reset_initial_composition becomes obsolete.


Known issue:
Some machines use a MPI implementation (e.g. MVAPICH on TACC TeraGrid)
that does not support system call. As a result, the compressed ASCII
output does not work on those machines.


Please check the NEWS and ChangeLog files for more details.

The code and user manual can be downloaded from:

http://www.geodynamics.org/cig/software/packages/mc/citcoms

-- 
Eh Tan
Staff Scientist
Computational Infrastructure for Geodynamics
2750 E. Washington Blvd. Suite 210
Pasadena, CA 91107
(626) 395-1693
http://www.geodynamics.org