[yt-users] wired square in enzo DM slice map

Junhwan Choi (최준환) choi.junhwan at gmail.com
Mon Jun 15 11:15:02 PDT 2015


Hi yt users,

I have asked a similar question previously but I did get partial
answer so that I ask again.
I have made cosmological IC from MUSIC and run with enzo.
I made the DM density map with velocity arrow at z=200 which is
initial redshift using yt (and attach the figure).
It shows the wired square feature.
Previously, John wise suggested me to use enzo SPH smoothing to remove
this issue and it worked.
But, after test a few more run, I have couple more fundamental
questions on this issue.

1) Is this wired square effect is real effect in enzo or visualization in yt?
    If this is an intrinsic enzo effect, we can say that DM gravity
calculation at high-z some kind of error.
    If this is an visualization effect, I found that other enzo
simulation using different IC generator does not show this effect (see
question 2).
    This difference makes me very confused.

2) I tested with other IC generator and I do not see the wired square feature.
    I found that other IC generator output real DM position while
MUSIC IC generate displacement of DM particle position.
    Can it be the origin of issue?


I think this inquiry can go to enzo mailing list or MUSIC developer.
If it is necessary, I can ask it to other place.

Thank you in advance,
Junhwan
-------------- next part --------------
A non-text attachment was scrubbed...
Name: cen_all_0000_Slice_z_Dark_Matter_Density.png
Type: image/png
Size: 125246 bytes
Desc: not available
URL: <http://lists.spacepope.org/pipermail/yt-users-spacepope.org/attachments/20150615/983f04bf/attachment-0001.png>


More information about the yt-users mailing list