Re: Aquila Project Initial Conditions

From: Volker Springel <volker_at_MPA-Garching.MPG.DE>
Date: Wed, 15 Apr 2015 16:56:19 +0200

Hi Jared,

I have checked these initial conditions. They seem to be fine, and the block structure is correct - but, they are stored in double precision, not in single precision (the latter is the default in Gadget2). Evidently, it would be good if this was stated on the web site.

Regards,
Volker Springel


On Apr 7, 2015, at 10:42 PM, Jared Coughlin <Jared.W.Coughlin.29_at_nd.edu> wrote:

> Hello! I recently downloaded the sph version of the Aquila project initial conditions from here:
>
> http://www.aip.de/People/cscannapieco/aquila/ICs/Gadget/
>
> The note says that the ics are in gadget format with units of 10^10 M_sun /h, Mpc/h, and km/s. I obtained the cosmological parameters from their paper:
>
> http://arxiv.org/pdf/1112.0315v3.pdf
>
> I tried running the Aq-C-6 ics but encountered several problems. First, gadget told me that it detected incorrect block sizes. I have since written a code that fixed this and also checked to make sure that the data itself was untouched by this procedure.
>
> The second problem, however, is that gadget, in the function check_omega in init.c, is obtaining a value of omega = 2.6e13, when it is supposed to be .25. I'm fairly certain that this is a units problem, and I was just wondering if anyone had worked with these ics before?
>
> For cosmology I have:
> Omega0 = .25
> OmegaLambda = .75
> OmegaBaryone = 0.04
> HubbleParam = 0.73
> BoxSize = 100.0 (This should be in Mpc / h, which is the unit of length that the Aquila project uses. I got this from Springel et al. 2008)
>
> For the system of units I have:
> UnitLength_in_cm = 3.085678e24
> UnitMass_in_g = 1.989e43
> UnitVelocity_in_cm_per_s = 1e5
>
> I'm pretty sure this system matches the note on the Aquila project site, but I could be wrong. Anyways, any help would be greatly appreciated! Thank you very much!
>
> Sincerely,
> -Jared
>
> -----------------------------------------------------------
>
> If you wish to unsubscribe from this mailing, send mail to
> minimalist_at_MPA-Garching.MPG.de with a subject of: unsubscribe gadget-list
> A web-archive of this mailing list is available here:
> http://www.mpa-garching.mpg.de/gadget/gadget-list
Received on 2015-04-15 16:56:22

This archive was generated by hypermail 2.3.0 : 2022-09-01 14:03:42 CEST