Comparision Project of Cosmological Numerical Codes: Convergence Issues in Fluid-Dynamics Processes.

(an Italo-German-Korean collaboration)


II. Cluster Comparison

Important!
This webpage hosts only one of the most relevant data produced during the Project, in particular the ones produced by the 'Bologna' section of the project. Many more data, figures and updated resources can be found at http://www.mpa-garching.mpg.de/~kdolag/Shocks/.

Initial conditions

To follow a resonably resolved cosmological box with a massive cluster we setup a box of size 40 Mpc/h with a intentionally large value of sigma8 : There is a set of initial conditions produced by Dongsu Ryu for 64³, 128³, 256³ and 512³ dark matter particles, inclusive some description on the data format available at http://canopus.cnu.ac.kr/shocks/.

Here you can find some theoretical predictions of (cumulative) massfunctions for the standard LCDM model (produced by K.Dolag) and the model addapte here. First column contains log10(M) in units of Msol/h, second column has the prediction of cumulative mass function log10(N) using Press & Schechter in units of 1/(Mpc/h)³ and third column the same using Sheth & Tormen.

Here is an idl program to create Gadget initial conditions from the above dark matter particle positions, setup_ic.pro. (K.Dolag)

The ICs for the gadget runs and the simulation data can be found on clx at CINECA under /clx/userhpe/hpedeue7/Data/ShockComp/

Performance

Legend:

ENZO  (non adaptive runs)
Run Time cpu Nproc Ntstep Ndm [Msol/h] Grid Res [kpc/h]
64³ 39 min
 16
 302
 64³
 625
128³ 689 min
 16
 474
 128³
 312.5
256³ -
 16 -
156.25
512³




ENZO (adaptive runs)
Base Grid.
 Max Grid.
 Tcpu
Nproc Ntstep Mdm/Mgas [Msol/h] Grid Res [kpc/h]
64³ -
16
 -

128³/512³ -
32
 -

256³ -
16


512³







Checks on dark matter particles distribution

Maps:

Shown are maps of projections of dm particles form different resolutions and volumes.
Blue points are for the  64³ run, red for the 128³ one.

DM particle distribution
central slice of 40Mpc/h
64³ /  128³  64³ /  128³ 
  
 

Shown are maps of projections of dm particles form the different code: black=TVD, red=Gadget2,
blue=Gadget2 (grid-like IC), green=ENZO.

DM particle distribution - comparision with the other codes
30Mpc/h 'carrot'
 30Mpc/h 'carrot'
64³  64³
  
    


Checks on gas distribution

Color Maps:

Shown are maps of projections/slices  for different resolutions. From left to right 64³,128³,256³ and 512³ and adaptive runs

Projected gas density
gas - fixed resolution -projection for 40Mpc/h gas - adaptive runs
64³ 128³ 256³ 512³
 
  



Projected gas temperature (mass weighted)
gas - fixed resolution
gas - adaptive runs
64³ 128³ 256³ 512³
 
 





Diagrams
gas - fixed resolution
DENSITY 64³/128³ TEMPERATURE 64³/128³
 PHASE DIAGRAM 64³/128³

     
  
 






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