<s>
CitCom	B-Application
(	O
for	O
California	O
Institute	O
of	O
Technology	O
Convection	O
in	O
the	O
Mantle	O
)	O
is	O
a	O
finite	O
element	O
code	O
designed	O
to	O
solve	O
thermal	O
convection	O
problems	O
relevant	O
to	O
earth	O
's	O
mantle	O
released	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
Written	O
in	O
C	B-Language
,	O
the	O
code	O
's	O
latest	O
version	O
,	O
CitComS	B-Application
,	O
runs	O
on	O
a	O
variety	O
of	O
parallel	O
processing	O
computers	O
,	O
including	O
shared	O
and	O
distributed	O
memory	O
platforms	O
.	O
</s>
<s>
CitCom	B-Application
was	O
originally	O
written	O
in	O
the	O
early	O
1990s	O
by	O
Louis	O
Moresi	O
(	O
Monash	O
U	O
.	O
)	O
.	O
</s>
<s>
Then	O
Shijie	O
Zhong	O
(	O
U	O
.	O
of	O
Colorado	O
,	O
Boulder	O
)	O
successfully	O
parallelized	O
CitCom	B-Application
using	O
message	O
passing	O
routines	O
on	O
a	O
limited	O
release	O
Intel	O
supercomputer	O
.	O
</s>
<s>
Zhong	O
then	O
created	O
a	O
spherical	O
version	O
of	O
the	O
code	O
which	O
he	O
named	O
CitComS	B-Application
.	O
</s>
<s>
Lijie	O
Han	O
(	O
Planetary	O
Science	O
Institute	O
)	O
then	O
created	O
a	O
regional	O
version	O
of	O
CitComS	B-Application
as	O
well	O
as	O
an	O
alternate	O
version	O
of	O
message	O
passing	O
for	O
an	O
arbitrarily	O
large	O
number	O
of	O
processors	O
.	O
</s>
<s>
A	O
plethora	O
of	O
different	O
versions	O
of	O
CitCom	B-Application
exist	O
both	O
on	O
computers	O
at	O
the	O
California	O
Institute	O
of	O
Technology	O
and	O
around	O
the	O
world	O
.	O
</s>
<s>
The	O
software	O
was	O
migrated	O
into	O
a	O
version	O
control	O
system	O
and	O
Eh	O
Tan	O
and	O
Eun-seo	O
Choi	O
(	O
Caltech	O
)	O
created	O
a	O
version	O
of	O
CitComS	B-Application
that	O
generates	O
either	O
a	O
fully	O
spherical	O
or	O
regional	O
model	O
,	O
CitcomSFull	O
and	O
CitcomSRegional	O
respectively	O
.	O
</s>
<s>
CitComS	B-Application
was	O
released	O
to	O
the	O
community	O
through	O
the	O
former	O
GeoFramework	O
project	O
as	O
version	O
1.0	O
and	O
1.1	O
.	O
</s>
<s>
By	O
2004	O
,	O
in	O
order	O
to	O
increase	O
the	O
functionality	O
of	O
CitComS	B-Application
,	O
the	O
developers	O
began	O
to	O
reengineer	O
the	O
code	O
into	O
an	O
object-oriented	O
environment	O
specifically	O
so	O
it	O
could	O
work	O
with	O
a	O
Python-based	O
modeling	O
framework	O
called	O
Pyre	O
.	O
</s>
<s>
This	O
release	O
of	O
the	O
software	O
,	O
now	O
named	O
CitComS.py,	O
is	O
essentially	O
the	O
product	O
of	O
those	O
reengineering	O
efforts	O
.	O
</s>
<s>
Eh	O
Tan	O
was	O
the	O
principal	O
developer	O
of	O
CitComS.py,	O
with	O
considerable	O
help	O
from	O
Eun-seo	O
Choi	O
and	O
Michael	O
Aivazis	O
(	O
Caltech	O
)	O
.	O
</s>
<s>
CitComS	B-Application
is	O
one	O
component	O
of	O
a	O
larger	O
collection	O
of	O
software	O
encompassed	O
by	O
the	O
former	O
GeoFramework	O
project	O
,	O
a	O
collaboration	O
between	O
the	O
Center	O
for	O
Advanced	O
Computing	O
Research	O
(	O
CACR	O
)	O
and	O
the	O
Seismological	O
Laboratory	O
,	O
both	O
at	O
Caltech	O
,	O
and	O
the	O
Victorian	O
Partnership	O
for	O
Advanced	O
Computing	O
in	O
Australia	O
.	O
</s>
<s>
During	O
2005	O
and	O
2006	O
much	O
of	O
the	O
remaining	O
software	O
developed	O
by	O
GeoFramework	O
was	O
released	O
under	O
a	O
GPL	B-License
license	I-License
and	O
made	O
available	O
from	O
Computational	O
Infrastructure	O
for	O
Geodynamics	O
(	O
CIG	O
)	O
.	O
</s>
<s>
The	O
second	O
major	O
release	O
of	O
CitComS	B-Application
(	O
2.0	O
)	O
incorporated	O
the	O
software	O
framework	O
Pyre	O
,	O
free	O
surface	O
modeling	O
methods	O
,	O
and	O
stress	O
boundary	O
conditions	O
on	O
the	O
top	O
and	O
bottom	O
surfaces	O
.	O
</s>
<s>
The	O
third	O
major	O
release	O
of	O
CitComS	B-Application
(	O
2.1	O
)	O
incorporated	O
new	O
features	O
and	O
functionality	O
,	O
the	O
most	O
important	O
being	O
the	O
use	O
of	O
HDF5	O
(	O
a	O
parallel	O
version	O
of	O
the	O
Hierarchical	O
Data	O
Format	O
)	O
.	O
</s>
<s>
The	O
latest	O
release	O
of	O
CitComS	B-Application
(	O
2.2	O
,	O
3/27/07	O
)	O
incorporates	O
the	O
ability	O
of	O
tracing	O
particles	O
in	O
the	O
flow	O
.	O
</s>
