Sverre Aarseth's Institute of Astronomy N-Body and Downloads Page

Introduction

My research into numerical simulations of many-body (N-body) gravitational interactions spans over 40 years, and is reported in several publications and my book. I have developed a set of FORTRAN codes which describe the dynamics very closely, and these are regarded by many as the de facto standard. I have explained below how you can download these codes for execution on your local computer system.

Code Tree

NBODY6 code tree from Doxygen documentation can be found here.

Downloads

For those of you with an FTP tool, you can access my public N-Body directory at ftp://ftp.ast.cam.ac.uk/pub/sverre/. Your browser (such as Microsoft's Internet Explorer) should present you with an FTP viewer window when you click on this link. If so, you should be able to copy whole code group directories at a time.

Otherwise please use the links below to identify and download the specific files that you need.

At any time if you'd like further information, please do contact me.

Code Group	Filename	Filesize (Kb)	Notes
	CODES	2	General textual description of the codes.

nbody1	README	1	The version nbody1.tar.Z is in full REAL8. The file nbody1_real4.tar.Z is the old version with mixed REAL4/*8 precision which is kept for historical reasons. The recent file nbody1h.tar.gz is the Hermite block-step formulation for workstations and (micro-)GRAPE, developed with Jun Makino in 1991.
	nbody1.tar.Z	26
	nbody1_real4.tar.Z	26
	nbody1h.tar.gz	140

nbody2	nbody2.tar.Z	213	Directory nbody2 contains the code NBODY2 and an article describing it. The whole file is called nbody2.tar.Z. Inside is the code, the article chap9.tex and also chap9.ps. The article may be produced in TeX using the enclosed macro svnyp.sty (or see New Ast. 6, 277). The code NBODY2H is the Hermite block-step version of NBODY2.
	nbody2h.tar.Z	185

nbody3	nbody3.tar.Z	204	One force polynomial with full regularization.

nbody4	README	1	The public GRAPE-6 or micro-Grape code NBODY4 and the equivalent brute force code for workstations or laptops called BRUT4. The current versions were updated 12 March 2006. Introduction to running simulations.
	nbody4.tar.gz	360
	brut4.tar.gz	340
	intro_nbody4.pdf	1

nbody5	README	1	The code NBODY5 has been heavily used but is no longer updated. NBODY6 is recommended instead.
	nbody5.tar.Z	289

nbody6	README	1	README contains some past history of NBODY6. Further practical info can be found in directory Docs. nbody6.tar.gz holds the new standard code NBODY6. The previous 2006 version has been renamed as old6.tar.gz. The postscript file man6.pdf is the new manual. The 2006 manual has been renamed as ps file old6.ps. Rainer Spurzem's corresponding parallel code, nbody6++, can be obtained here. Introduction to running simulations. README2 contains input file for using GPU with nbody6. guide.pdf is guide for SSE and GPU with nbody6. Tar file for the GPU directory and library. Text file for updating of astrophysics (11/2015). Copy of text file for all output channels in the new NBODY6. pdf file of our 2012 NBODY6-GPU paper.
	nbody6.tar.gz	980
	old6.tar.gz	640
	man6.pdf	200
	old6.ps	306
	intro_nbody6.pdf	1
	README2	1
	guide.pdf	30
	archain.tar.gz	65
	README_SSE	10
	fort.x	25
	nbody6-gpu.pdf	250

planet	planet.tar.Z	16	PLANET is a Hermite code for planetesimals. PLANET3 is a planetary code with fragmentation.
	planet3.tar.Z	30

triple	triple.tar.Z	13	Basic version of three-body regularization. TRIPLE movie code with X11 graphics.
	movie3.tar.Z	26

chain	chain.tar.Z	20	Basic chain version. CHAIN2 includes the slow-down procedure (Cel. Mech. 64, 197). Other versions are available upon request. movie.tar.Z holds X11 movie version of CHAIN.
	chain2.tar.Z	26
	movie.tar.Z	48

comove	comove.tar.Z	28	Cosmological N-body code in comoving coordinates.

errata	README	1	The file "errata" is a text file for book errata of 3/10/03 and "errata.ps" is the corresponding postscript file. The text file "errata2" contains subsequent mistakes.
	errata	2
	errata.ps	54
	errata2	1

hermit	hermit.tar.Z	16	HERMIT is a basic Hermite N-body code. HERMIT2 uses time-symmetric Hermite method of Kokubo et al. HERMIT3 is standard Hermite with Burdet-Heggie regularization. HERMIT4 is time-symmetric Hermite with Burdet-Heggie regularization. The manual is described in the postscript file hermit4.ps.
	hermit2.tar.Z	16
	hermit3.tar.Z	10
	hermit4.tar.Z	43
	hermit4.ps	133

toy	README	15	Toy codes for unperturbed two-body motion. Five different regularization methods are implemented. A new version called hermit.tar.Z includes Post-Newtonian perturbations derived from the 2005 paper of Mora and Will. The file ksreg2.tar.gz contains Mora & Will PN2.5 and derivative terms.
	toy.tar.Z	65
	hermit.tar.Z	22
	ksreg2.tar.gz	15

multireg	README	1
	triple.tar.Z	22	triple.tar.Z holds the three-body regularization code described in the manual. chain0.tar.Z contains the basic chain regularization code as described in the manual manreg.ps. chain.tar.Z gives the full version with many optional features and is described in the manual. The postscript file manreg.ps is the manual for the three-body and chain codes. triple2.tar.Z contains the standard AZ method with an external potential as well as optional movie facilities for PGPLOT and X11. The code triple3.tar.Z contains GR example discussed in 2007 paper. A PN/movie version of TRIPLE called kozai.tar.gz was added 28/6/2012.
	chain0.tar.Z	14
	chain.tar.Z	45
	manreg.ps	220
	triple2.tar.Z	32
	triple3.tar.Z	50
	kozai.tar.gz	30

talks	talks.tar.gz	600	N-body talks Nov 2006.

nbody0	nbody0.f	1	Compact fourth-order Hermite block-step code.

Code Group

Filename

Filesize (Kb)

Notes

CODES

General textual description of the codes.

nbody1

README

The version nbody1.tar.Z is in full REAL*8.
The file nbody1_real4.tar.Z is the old version with mixed REAL*4/*8 precision which is kept for historical reasons.
The recent file nbody1h.tar.gz is the Hermite block-step formulation for workstations and (micro-)GRAPE, developed with Jun Makino in 1991.

nbody1.tar.Z

nbody1_real4.tar.Z

nbody1h.tar.gz

140

nbody2

nbody2.tar.Z

213

Directory nbody2 contains the code NBODY2 and an article describing it. The whole file is called nbody2.tar.Z. Inside is the code, the article chap9.tex and also chap9.ps. The article may be produced in TeX using the enclosed macro
svnyp.sty (or see New Ast. 6, 277). The code NBODY2H is the Hermite block-step version of NBODY2.

nbody2h.tar.Z

185

nbody3

nbody3.tar.Z

204

One force polynomial with full regularization.

nbody4

README

The public GRAPE-6 or micro-Grape code NBODY4
and the equivalent brute force code for workstations or laptops
called BRUT4.
The current versions were updated 12 March 2006.
Introduction to running simulations.

360

340

nbody5

The code NBODY5 has been heavily used but
is no longer updated. NBODY6 is recommended instead.

nbody5.tar.Z

289

nbody6

README

README contains some past history of NBODY6.
Further practical info can be found in directory Docs.
nbody6.tar.gz holds the new standard code NBODY6.

The previous 2006 version has been renamed as old6.tar.gz.

The postscript file man6.pdf is the new manual.

The 2006 manual has been renamed as ps file old6.ps.
Rainer Spurzem's corresponding parallel code, nbody6++,
can be obtained here.

Introduction to running simulations.

README2 contains input file for using GPU with nbody6.

guide.pdf is guide for SSE and GPU with nbody6.

Tar file for the GPU directory and library.

Text file for updating of astrophysics (11/2015).

Copy of text file for all output channels in the new NBODY6.

pdf file of our 2012 NBODY6-GPU paper.

980

640

200

306

250

planet

planet.tar.Z

PLANET is a Hermite code for planetesimals.
PLANET3 is a planetary code with fragmentation.

planet3.tar.Z

triple

triple.tar.Z

Basic version of three-body regularization.
TRIPLE movie code with X11 graphics.

movie3.tar.Z

chain

chain.tar.Z

Basic chain version. CHAIN2 includes the slow-down
procedure (Cel. Mech. 64, 197).
Other versions are available upon request.
movie.tar.Z holds X11 movie version of CHAIN.

chain2.tar.Z

movie.tar.Z

comove

comove.tar.Z

Cosmological N-body code in comoving coordinates.

errata

README

The file "errata" is a text file for book errata of 3/10/03
and "errata.ps" is the corresponding postscript file.
The text file "errata2" contains subsequent mistakes.

hermit

HERMIT is a basic Hermite N-body code.
HERMIT2 uses time-symmetric Hermite method of Kokubo et al.
HERMIT3 is standard Hermite with Burdet-Heggie regularization.
HERMIT4 is time-symmetric Hermite with Burdet-Heggie regularization.
The manual is described in the postscript file hermit4.ps.

133

toy

README

Toy codes for unperturbed two-body motion.
Five different regularization methods are implemented.
A new version called hermit.tar.Z includes Post-Newtonian
perturbations derived from the 2005 paper of Mora and Will.
The file ksreg2.tar.gz contains Mora & Will PN2.5 and derivative terms.

multireg

triple.tar.Z holds the three-body regularization code described in the manual.
chain0.tar.Z contains the basic chain regularization code as described in the manual manreg.ps.
chain.tar.Z gives the full version with many optional features and is described in the manual.
The postscript file manreg.ps is the manual for the three-body
and chain codes.
triple2.tar.Z contains the standard AZ method with an external
potential as well as optional movie facilities for PGPLOT and X11.
The code triple3.tar.Z contains GR example discussed in 2007 paper.
A PN/movie version of TRIPLE called kozai.tar.gz was added 28/6/2012.

220

talks

600

N-body talks Nov 2006.

nbody0

nbody0.f

Compact fourth-order Hermite block-step code.

Sverre Aarseth
All-Round N-Body Guy, Mountaineer and Wild-Life Enthusiast

Sverre's web pages are hosted by the University of Cambridge Institute of Astronomy
	Original site design by Steve Taylor at FutureAspect www.futureaspect.net