SWIFT

The SWIFT subroutine package written by Hal Levison and Martin Duncan is designed to integrate a set of mutually gravitationally interacting bodies together with a group of test particles which feel the gravitational influence of the massive bodies but do not affect each other or the massive bodies. Four integration techniques are included:

Wisdom-Holman Mapping^[1] (WHM). This algorithm was created by Jack Wisdom & Matt Holman (Click here for a reference).

Regularized Mixed Variable Symplectic (RMVS) method. This handles close approachs between test particles and planets. This algorithm was created by Hal Levison & Martin Duncan (Click here for a reference) and based on WHM.

A fourth order T+U Symplectic (TU4) method. This algorithm was created by Jeff Candy and W. Rozmus. Also see Martin Duncan, Brett Gladman, and Jeff Candy (Click here for a reference).

A Bulirsch-Stoer method.

The package is designed so that the calls to each of these look identical so that it is trivial to replace one with another.

We know that SWIFT will run on HP9000s, SUNs, MIPS, IBM RS6000, DEC alphas (UNIX and Linux), PC's (Linux) and DECstations. We do not support VMS, but Sandy Keiser of DTM have written a version for VMS, which we are distributing. Click here for more information of the VMS version. If you are going to run SWIFT on a machine not listed, please let us know how it works.

You can get a compressed tar file of swift by clicking here. Put swift.tar.Z into a directory that you will use as the main SWIFT directory. Now you uncompress and un-tar the file by entering:

uncompress swift.tar.Z
tar xovf swift.tar

Now continue by reading the README.first file.

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^[1] This algorithm was known as MVS in previous releases of Swift.

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