Author : Y. Fraigneau, LISN, UMR CNRS 9015 (yann.fraigneau@lisn.fr)
Date : June 2019
Simulation type : DNS (code Sunfluidh – Sunfluidh code)
Location : /DATABASE_2DFLOW_AROUND_HEATED_SQUARECYLINDER_DNS
Status : Free access for laboratory members, on request for external members
Data size : ~ 1 Gb

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1. axes :
   • x(i) : downstream direction
   • y(j) : normal direction
2. origin : lower left corner of the computational domain
   • $x_0= 10h$
   • $y_0= -6h$

• Density : mass density of the fluid ($\rho_0$)
• Lengths : cylinder size ($h$) and $H_u= 10h$ the distance between the domain's top and the square-cylinder's top.
• Velocity : velocity at inlet ($U_0$)
• Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
• thermal diffusivity : ($\kappa_0$)
• Reynolds number : $Re_h= \frac{\rho_0.U_0.h}{\mu_0}= 50$
• Rayleigh number : $Ra_{Hu}= \frac{\rho_0.\beta.g\Delta T.H_u^3}{\mu_0 \kappa_0}= 5\;10^6$

• velocity : $U^*=\frac{U}{U_0}$
• density : $\rho^*= \rho/\rho_0= 1$
• coordinates : $x*=\frac{x}{h}$, $y^*=\frac{y}{h}$
• temperature : $T^*=\frac{T-T_c}{T_h-T_c}$ ($T_h$ and $T_c$ are respectively the temperature imposed at the cylinder's walls and the temperature at the inlet and channel's walls)

1. Domain scope
   1. computational domain size (channel flow)
      • Downstream direction(x) : $L_x^*= 50.0$ (upward part $L_u= -10$, downward part $L_d=40$)
      • Normal direction (y) : $H*= 20.0$
   2. heated square cylinder
      • size: $h^*= 1$
      • wall temperature T_h^*= 1

1. Boundary conditions
   • Inlet : imposed pressure uniform velocity ($U_0=1$)
   • Outlet : Orlansky type
   • Bottom and top conditions : walls at (T_c^*=0)
2. Spatial resolution
   • mesh size : $512 \times 256 $ (131.072 cells)
   • About cell-size
     • $\Delta x*$ : from $0.03125$ to $0.723$ (downstream direction)
     • $\Delta y*$ : from $0.03125$ to $0.187$ (normal direction)

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• Time series
  • Physical quantities : velocity components along x and y directions (u,v) and pressure (p)
  • 1 probe
  • Time step= $\approx 6 \,10^{-2}$ time unit (irregular time step)
  • Time range : 250 time units
  • Location : Xi= 20.0 , Xj=2.0
  • File name (per physical quantity): x_ins_00000.d with x= u,v,t

• 3D snapshots
  • Instantaneous fields : velocity components in x, y and z directions (U,V), the pressure (P) and the phase function related to the body motion (TRACE)
  • Recording rate : 1 time unit
  • Time range from from 20.0 to 250.0 time units
  • File name : res_xxxxx_yyyyyyy.d
    • MPI subdomain ID: from 0 to 3 (case with MPI domain decomposition)
    • Time ID : from 0 to 250

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Data size : ~ 3 Gb
Main directory : /vol/DATABASE_MECA/DATABASE_2DFLOW_HEATED_SQUARRECYLINDER_DNS

Directories & files

                               
  /DATASETUP       : ASCII files
                     input data file for sunfluidh : input3d.dat (and input3d.dat_mpi4 for the case with MPI domain decomposition)
  
  /GRID            : ASCII files
                     input data file         : data_meshgen.d
                     grid files for sunfluidh: maillx.d, mailly.d, maillz.d (sequential case)
                                               mesh.tar (archive containing grid files for a domain decomposition with 4 MPI processes)
   
  /SNAPSHOTS       : snapshots binary files res_xxxxx_yyyyyyy.d
  /SNAPSHOTS_MPI4  : snapshots resulting from a domain decomposition with 4 MPI processes
  
  /TIMESERIES      : ASCII files
                     u_ins_00000.d , v_ins_00000.d and t_ins_00000.d (timeseries of the velocity components and temperature from probe)

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