CFD DATABASE

Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : April 2019
Simulation type : DNS (Sunfluidh code)
Location : DATABASE_JET_TROUGH_OSCILLATING_BODIES_DNS
Status : Free access
Data size : ~ 2.3 Gb

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1. axes :
   • x(i) : downstream direction
   • y(j) : normal direction
   • z(k) : spanwise direction
2. origin :
   • $x_0= 0$ : upstream edge of the oscillating bodies
   • $y_0= 0$ : lower horizontal wall of the duct
   • $z_0= 0$ : left vertical wall of the duct

• Density : mass density of the fluid ($\rho_0$)
• Length : duct height ($H$)
• Pressure : pressure variation between inlet and outlet, respectively ($\Delta P_0= P_i-P_o$)
• Velocity : velocity scale ($U_0=\sqrt{\frac{P_i-P_o}{\rho_0}}$)
• Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
• Body oscillation frequency : $f_0$ , $3$ frequencies are considered over the time range of the simulation ($f_0= 0.25 , f_0=0.50,f_0= 1.0 $)
• Reynolds number : $Re_H= \frac{\rho_0.U_0.H}{\mu_0}= 1000$
• Strouhal number : $St_0=\frac{H.f_0}{U_i}$

• velocity : $U^*=\frac{U}{U_0}$
• pressure : $P^*=\frac{P}{\Delta P_0}$
• density : $\rho^*= \rho/\rho_0= 1$
• coordinates : $x*=\frac{x}{H}$, $y^*=\frac{y}{H}$ , $z^*\frac{z}{H}$

1. Domain scope
   1. Duct
      • Downstream direction(x) : $L^*= 6.0$ (upward duct $L_u= 1$, downward duct $L_d=4.5$)
      • Normal direction (y) : $H^*= 1.0$
      • Spanwise direction (z) : $l^*= 1.0$
   2. Oscillating bodies (couple of parallelepiped bodies oscillating vertically in opposite phase)
      • Upstream edge position : $x_1=x_2= 0.0$
      • length (x): $L_b= 0.5$
      • height (y): Body's heights vary in regard to time $t$ in such a way the clearance $h_c$ between bodies evolves as $h_c= h_m*\sin(2\pi.f_0.t)$
      • width (z) : $l_z=1.0$
      • bodies are modeled with a pseudo-penalisation method (Pasquetti et al., Applied Numerical Mathematics, 2008)
2. Boundary conditions
   • Inlet : imposed pressure condition ($P_i=1$)
   • Outlet : imposed pressure condition ($P_o=0$)
   • Wall conditions : usual no-slip conditions on walls

1. Spatial resolution

• Regular grid : $180 \times 80 \times 40$ (576.000 cells)
• About cell-size
  • $\Delta x*= 0.0333$ (downstream direction)
  • $\Delta y*= 0.0125$ (normal direction)
  • $\Delta z*=0.0250$ (spanwise direction)

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• 3D snapshots
  • Instantaneous fields : velocity components in x, y and z directions (U,V,W), the pressure (P) and the phase function related to the body motions (TRACE)
  • Recording rate : 0.05 time unit
  • Time range from from 0.0 to 100.0 time units
  • File name : res_xxxxx_yyyyyyy.d
    • MPI subdomain ID: 0
    • Time ID : from 1 to 2000

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Data size : ~ 2.3 Gb
Main directory : /vol/DATABASE_MECA/DATABASE_JET_TROUGH_OSCILLATING_BODIES_DNS
For more details about files, see the wiki doc of Sunfluidh

                               
  /DATASETUP       : ASCII files
   
   input data file for sunfluidh : input3d.dat
   
  /SNAPSHOTS  : snapshots binary files res_xxxxx_yyyyyyy.d
               

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