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
