Help with cluster.param snapshot timing calcs

From: Timothy Dwight Dunn <Timothy.Dunn_at_Colorado.EDU>
Date: Thu, 14 Jul 2011 11:36:11 -0600 (MDT)

I'm trying to setup my first Cosmological model with Gadget and was trying to figure out how to set up the time intervals for a quick test run and then a longer real run. So I popped into the demo models and looked at the cluster.param file and am confused on its settings. I was hoping someone could clarify how the settings were determined for it.

TimeBegin 0.041666666 % Begin of the simulation (z=23)
TimeMax 1.0

TimeBetSnapshot 0.047619048 % z=20
TimeOfFirstSnapshot 1.8384163 % 5 constant steps in log(a)


What I'm confused about is how do I have a Snapshot starting at a time almost twice the max time and how does the TImeBetSnapshots actually add up to 5 equally spaced intervals? I agree the math is simple but sadly I must be using the wrong numbers when I calc it as I don't get values anywhere near that is used.

Sorry for my ignorance I normally work with galactic collision and various collapsar/black hole models, this is my first cosmological galaxy cluster setup I have attempted.

Thanks
Tim
Received on 2011-07-14 19:36:15