[yt-dev] unitrefactor: enzo metal fields
Matthew Turk
matthewturk at gmail.com
Fri Dec 6 06:43:05 PST 2013
Hi Bitton,
On Fri, Dec 6, 2013 at 9:10 AM, Britton Smith <brittonsmith at gmail.com> wrote:
> Hi all,
>
> I trying to add the metallicity field back to the enzo frontend and am
> wondering what field registry it would be appropriate to put it in. Anyone
> have any thoughts on this?
So -- the way it's currently set up is that each frontend has a set of
fields defined like so:
known_other_fields = (
("Cooling_Time", ("code_time", ["cooling_time"], None)),
("HI_kph", ("1/code_time", [], None)),
("HeI_kph", ("1/code_time", [], None)),
...
(Note that in breaking with tradition, this includes a mutable in the
class definition. I think it's okay.)
The format of these tuples is:
("FieldNameOnDisk", ("units_on_disk", ["alias_to_this_yt_field",
"and_this_one"], "display_name_or_none")
So what I think you would want is a generic metallicity field, and an
alias to that. For now, I've been putting "generic yt field" names in
yt/frontends/stream/fields.py but I would eventually like to move them
elsewhere, so that there can be a collection of fields that yt knows
about and that people can utilize. Right now this is a poor
reference. RAMSES has a "Metallicity" field aliased as "metallicity"
presently, but no units.
I'm glad this came up, since this is a design decision that hasn't
been reviewed or commented on. Feedback?
>
> Additionally, I noticed that the particle field metallicity_fraction
> currently has units of Zsun. As far as I know, this is not correct. I
> believe the field is actually unitless and would have to be divided by ~0.02
> to be in units of Zsun. How can I set this up correctly to make it aware of
> these units?
My understanding is that you can set the units to be "Zsun / 0.02" in that case.
>
> Should I make a "code_metallicity" unit? This might actually be usable for
> the gas metallicity field as well.
Potentially, but I'm not certain, as we may then step into the mess of
defining interoperability with other units.
-Matt
>
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