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datasetmeca:cavityflow_1

3D shear-layer driven cavity flow at $Re_{L_c}= 7826$

Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : July 2020
Simulation type : DNS (Sunfluidh code)
Location : DATABASE_CAVITY3D_R2_RE7826_PER1.0_DNS/NOFORCINGTERM
Status : Free access
Data size : ~ 31 Gb

A video is available here

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Simulation settings


2D sketch

Referential : cartesian geometry

  1. axes :
    • x(i) : downstream direction
    • y(j) : normal direction
    • z(k) : spanwise direction
  2. origin :
    • $x_0= 0$ : upstream edge of the cavity
    • $y_0= 0$ : upstream edge of the cavity
    • $z_0= 0$ : upstream edge of the cavity, at the mid-span location

Reference scales

  • Density : mass density of the fluid ($\rho_0$)
  • Length : cavity length ($L_c$)
  • Velocity : inlet bulk velocity ($U_i$)
  • Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
  • Reynolds number : $Re_H= \frac{\rho_0.U_i.L_c}{\mu_0}= 7826$

Non-dimensionalised data

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

Computational domain

  1. Domain scope
    • Downstream direction(x) : $L^*= 4.0$
    • Normal direction (y) : $H_t^*= 1.25$
    • Spanwise direction (z) : $l^*= 1.0$
    • upstream vein length : $L_u^*= 0.5$
    • cavity height : $H_c^*= 0.5$
  2. Boundary conditions
    • Inlet : Blasius' profile at $X_{in}^*= -0.5$. Boundary layer thickness $\delta^*= 8.75 \, 10^{-2}$
    • Outlet : Orlansky's type at $X_{out}^*= 3.5$
    • Wall conditions : floor and cavity walls
    • Periodicity : lateral ends of the domain (spanwise direction)
    • Symmetry plan : top of the domain
  3. Spatial resolution :
    • Grid : $192 \times 128 \times 64$ per subdomain (1.572.864 cells over the domain)
    • About cell-size
      • $\Delta x_{min}^*= 1.0 \, 10^{-2} \quad \Delta x_{max}^*= 3.96 \,10^{-2}$ (downstream direction)
      • $\Delta y_{min}^*= 7.5 \, 10^{-3} \quad \Delta y_{max}^*= 1.45 \,10^{-2}$ (normal direction)
      • $\Delta z_{min}^*=\Delta z_{max}^*= 1.5625 \, 10^{-2}$ (spanwise direction)

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Data features


  • Time series from probes
    • Physical quantities : velocity components along x, y and z directions (u,v,w) and pressure (p)
    • 11 probes
    • Time step= 0.0525 time unit
    • Time range : 200 to 400 time units
    • Locations (In vertical mid-plan at $z=0.0$)
      • Xi=0.2 , Xj= -0.3 , Xk= 0.0
      • Xi=0.5 , Xj= -0.3 , Xk= 0.0
      • Xi=0.8 , Xj= -0.3 , Xk= 0.0
      • Xi=0.1 , Xj= 0.05 , Xk= 0.0
      • Xi=0.5 , Xj= 0.05 , Xk= 0.0
      • Xi=0.9 , Xj= 0.05 , Xk= 0.0
      • Xi=1.0 , Xj= 0.05 , Xk= 0.0
    • File name (per physical quantity) : x_ins_yyyyy.d with x= u,v,w,p and 'yyyyy' the MPI subdomain ID
  • 3D snapshots
    • Instantaneous fields : velocity components in x, y and z directions (U,V,W) and pressure (P)
    • Recording rate : 0.25 time unit
    • Time range from from 210.0 to 400.0 time units
    • File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
      • MPI subdomain ID: 0
      • Time ID : from 1 to 760
  • 2D slices
    • Instantaneous fields : velocity components in x, y and z directions (U,V,W) and pressure (P)
    • Recording rate : 0.05 time units
    • Time range from from 210 to 400 time units
    • File name : slice_n_idir_xxxxx_yyyyyyy.d (n : slice number ID, idir : normal orientation= 1: x(i), 2: y(j), 3: z(k), xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
      • MPI subdomain ID: 0
      • Time ID : from 1 to 3801
    • 8 slices
      • slice ID : 1 - normal orientation : spanwise - location : $z=-3.390625 \,10^{-2}$
      • slice ID : 2 - normal orientation : spanwise - location : $z=-2.234375 \,10^{-2}$
      • slice ID : 3 - normal orientation : spanwise - location : $z=-7.8125 \,10^{-2}$
      • slice ID : 4 - normal orientation : spanwise - location : $z=7.8125 \,10^{-2}$
      • slice ID : 5 - normal orientation : spanwise - location : $z=2.234375 \,10^{-2}$
      • slice ID : 6 - normal orientation : spanwise - location : $z=3.390625 \,10^{-2}$
      • slice ID : 7 - normal orientation : normal - location : $y=-0.25$
      • slice ID : 8 - normal orientation : normal - location : $y=0.03$
  • 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 = 200.0 time units
    • Time range per file = 50.0 time units
    • Total time range from 200.0 to 400.0 time units
    • file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
      • MPI subdomain ID : 0
      • Time ID : 1 to 4

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Database organisation


Data size : ~ 9.5 Gb
Main directory : /vol/DATABASE_MECA/DATABASE_CAVITY3D_R2_RE7826_PER1.0_DNS/NOFORCINGTERM
For more details about files, see 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
   velocity profile (Blasius' boundary layer) at the inlet : inlet_velocity_profile.dat 
  
  /TIMESERIES : contains time series recorded over the time range [200,513.3]
                ASCII files : x_ins_00000.d   with x= u,v,w,p
               
  /SNAPSHOTS  : snapshots binary files res_xxxxx_yyyyyyy.d
               
  /STATISTICS : statistics binary files files rst_xxxxx_yyyyyyy.d
               
  /RESTART_AR : backup/restart archive save_t400.tar for time= 400 time units
  

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datasetmeca/cavityflow_1.txt · Dernière modification: 2021/06/05 20:04 de yann