Spectra for No-Shear Production Run

Both spectra are taken within a 40 pc cube at the center of the simulation domain, coinciding with the collision region. This is for the No Shear case, taken at t=0 (above) and t=10 Myr (below). Fields are given in the legend, from top to bottom: Total Energy (Field 105), Gravitational Energy, Kinetic Energy, Magnetic Energy, rho2, v2, v_div2.

Initial conditions:

Nothing too interesting here. We see all energies are largest on largest size scales (smallest wave numbers on x-axis) and drop off to 0 on the smallest size scales. I guess this size scale would correspond to the smallest cell size. There are no features on the largest scales, meaning that the power on those scales is pretty uniform over that range. As we move to smaller scales, the power falls off. This makes sense — smaller volume elements contain less energy than the bulk. However, at a certain scale we begin to see wiggles. This indicates we are getting an enhancement of energy on those scales. I guess this has to do with the rippled interface of the collision region.

The different forms of energy all look the same at t = 0, they all are composed of doublet-peaks. This seems to make sense, that they would be functionally similar at t=0. One thing that is different about them is the height of their peaks in the various spectra. The magnetic, gravitational, and density curves seem to share the same peak heights, but on different absolute scales. The Kinetic and Total energy curves also share the same peak heights, but now they lie on top of each other, and the same goes for v2 and v_div2.

t=10 Myr

Here is a page on this plot with the details on how I generated them:

​https://astrobear.pas.rochester.edu/trac/wiki/u/erica/CF_Spectra

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