Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@lisn.fr)
Date : June 2020
Simulation type : DNS (Sunfluidh code) Location : DATABASE_CHANNELFLOW_RETAU180_DNS
Status : Free access
Data size : ~ 13 Gb

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1. axes :
   • x(i) : downstream direction
   • y(j) : normal direction
   • z(k) : spanwise direction
2. origin :
   • $x_0= 0$ : left down corner
   • $y_0= 0$ : left down corner
   • $z_0= 0$ : left down corner

• Density : mass density of the fluid ($\rho_0$)
• Length : half height of the channel ($h=\frac{H}{2}=1$)
• Velocity : wall friction velocity ($u_*$)
• Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
• Reynolds number : $Re_H= \frac{\rho_0.u_*.h}{\mu_0}= 180$

• velocity : $U^*=\frac{U}{u_*}$
• density : $\rho^*= \rho/\rho_0= 1$
• coordinates : $x*=\frac{x}{h}$, $y^*=\frac{y}{h}$ , $z^*=\frac{z}{h}$

1. Domain scope
   • Downstream direction(x) : $L_x^*= 2\pi$
   • Normal direction (y) : $H^*= 2.0$
   • Spanwise direction (z) : $l^*= \pi$
2. Boundary conditions
   • Wall conditions : Top and low walls of the domain
   • Periodicity : lateral ends of the domain in $x$ and $z$ directions
3. Spatial resolution :
   • Grid : $96 \times 128 \times 96$ (1.179.648 cells over the domain)
   • About cell-size
     • $\Delta x_{min}^*= \Delta x_{max}^*= 6.545 \,10^{-2}$ (downstream direction)
     • $\Delta y_{min}^*= 2.780\, 10^{-4} \quad \Delta y_{max}^*= 3.088 \,10^{-2}$ (normal direction)
     • $\Delta z_{min}^*= \Delta z_{max}^*= 3.2725 \, 10^{-2}$ (normal direction)

• Time series from probes
  • Physical quantities : velocity components along x, y and z directions (u,v,w) and pressure (p)
  • 7 probes
  • Time step= 0.0126 time unit
  • Time range : 97.09 to 301.09 time units
  • Locations (In vertical plan at $z=1.57$)
    • Xi= 3.14, Xj= 0.25 , Xk= 1.57
    • Xi= 3.14, Xj= 0.75 , Xk= 1.57
    • Xi= 3.14, Xj= 1.00 , Xk= 1.57
    • Xi= 3.14, Xj= 1.25 , Xk= 1.57
    • Xi= 3.14, Xj= 1.50 , Xk= 1.57
    • Xi= 3.14, Xj= 1.75 , Xk= 1.57

• File name (per physical quantity): x_ins_00000.d with x= u,v,w,p

• 3D snapshots
  • Instantaneous fields : velocity components in x, y and z directions (U,V,W) and pressure (P)
  • Recording rate : 0.3 time units
  • Time range from 97.39 to 301.09 time units
  • File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
    • MPI subdomain ID: 0
    • Time ID : from 11 to 690

• Statistics
  • fields : (i,j : indexes of direction x, y or z)
    • Mean fields of velocity components (<Ui>) and pressure (<P>)
    • Mean fields of quadratic quantities (<P2>, <UiUj>)
  • Time average computation
  • Time startup = 100.0 time units
  • Time range per file = 25.0 time units
  • Total time range from 100.0 to 300 time units
  • file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
    • MPI subdomain ID : 0
    • Time ID : from 1 to 35

Data size : ~ 13 Gb
Main directory : /vol/DATABASE_MECA/DATABASE_CHANNELFLOW_RETAU180_DNS
For more details about files, see the the wiki doc of Sunfluidh

  /GRID : contains all ASCII files about grid setup
  
     input data file         : data_meshgen.d
     report on grid features : report_meshgen.d
     grid files for sunfluidh: maillx.d, mailly.d, maillz.d
     check files (ASCII)     : check_mesh_I.d,check_mesh_J.d,check_mesh_K.d
                               (3 columns : indices, cell-face coordinates, cell size)
                               
  /DATASETUP       : ASCII files
   
   input data file for sunfluidh : input3d.dat
  
  /TIMESERIES : contains time series recorded over the time range [16.64 ; 199.44]
                ASCII files : x_ins_yyyyy.d   with x= u,v,w,p
                time series files are sliced in storage directories CAS-MPI200-n (n from 5 to 50)
   
  /SNAPSHOTS  : snapshots binary files res_xxxxx_yyyyyyy.d
                files stored in archive files : res_yyyyyyy.tar for each time ID
               
  /STATISTICS : statistics binary files files rst_xxxxx_yyyyyyy.d
                files stored in archive files : res_z.tar , z is an ID number (from 1 to 35)
                      
  /RESTART_AR : backup/restart archive save.tar at time 301.09
  
  /FROM_COMPUTATION : regroups some files related to the simulation : checkcalc_00000.dat and checkdata_00000.dat
  

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