minor bug fix, version gadget-2.0.2

From: Volker Springel <volker_at_MPA-Garching.MPG.DE>
Date: Sat, 22 Apr 2006 16:02:28 +0200


There has been a bug in gadget-2.0.1 in the routine
force_treeupdate_pseudos(), file forcetree.c, line 759. Instead of the correct
        maxsofttype = (DomainMoment[i].bitflags >> 2) & 7;
        diffsoftflag = (DomainMoment[i].bitflags >> 5) & 1;

there was a

        maxsofttype = (Nodes[no].u.d.bitflags >> 2) & 7;
        diffsoftflag = (Nodes[no].u.d.bitflags >> 5) & 1;

This meant that there was a chance that internal top-level tree nodes may
not have contained the correct maximum gravitational softening length for
the represented particles in all cases when the UNEQUALSOFTENING option was
used. Since these nodes are rarely if ever used for force computations (and
if they are then they are at distances larger than the softening length), it
is unlikely that this ever affected the force computation in practice. The
error was also present in a slight different form when in addition

Two other small changes were made:

* the FLEXSTEPS option has been improved, and may now in principle used
together with the PMGRID option
* when FLEXSTEPS is used, the PM-stepsize may now also shrink with time and
the PM computation is not restricted anymore to steps where all particles
are active

The updated version is available on the web-site as version 2.0.2. (Patched
files are forcetree.c, timestep.c, longrange.c, init.c, run.c, allvars.h)

Received on 2006-04-22 16:02:08

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