Outils pour utilisateurs

Outils du site


datasetmeca:chflow_2

Ceci est une ancienne révision du document !


3D turbulent channel flow at $Re_{\tau}= 180$

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


Come back to first page


Simulation settings


2D sketch

Referential : cartesian geometry

  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

Reference scales

  • 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 : $Re_H= \frac{\rho_0.u_*.h}{\mu_0}= 180$

Non-dimensionalised data

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

Computational domain

  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 : $96 \times 128 \times 96$ per subdomain (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)

Data Recording : information about data types


  • 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

Database organisation


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

Directories & files

  /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
  

Come back to first page

Traductions de cette page:
datasetmeca/chflow_2.1606149910.txt.gz · Dernière modification : 2020/11/23 17:45 de yann

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki