===== 3D planar jet through oscillating bodies at $Re_{H}= 1000$ =====

<note>
The motion of bodies is vertical and forced with a sinusoïdal function\\
Three different frequencies are considered
</note>

**Author** :  Y. Fraigneau, LISN, UMR CNRS 9015 (yann.fraigneau@lisn.fr) \\
**Date**   :  April 2019\\
**Simulation type** : DNS (code Sunfluidh -- [[https://sunfluidh.lisn.upsaclay.fr|Sunfluidh code]]) \\
**Location** : DATABASE_JET_TROUGH_OSCILLATING_BODIES_DNS \\
**Status** : Free access for laboratory members, on request for external members \\
**Data size** : ~ 2.3 Gb \\


{{ :datasetmeca:pict_flow_through_osc_bodies.png?900 |}}

[[https://sunfluidh.lisn.upsaclay.fr/doku.php?id=sunfluidh:sunfluidh_gallery| A video is available here ]]


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==== Simulation settings ====
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=== 2D sketch ===

{{ :datasetmeca:sketch2d_jet_constriction.jpg?800 |}}

=== Referential : cartesian geometry ===
   - axes   :
      * x(i) : downstream direction
      * y(j) : normal direction
      * z(k) : spanwise direction
    - 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

===  Reference scales ===

   * 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 : $St_0=\frac{H.f_0}{U_i}$         

=== Non-dimensionalised data ===

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

=== Computational domain ===

   - **Domain scope**
           - 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) : $l^*= 1.0$
          - 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)
  - **Boundary conditions**
      * Inlet           : imposed pressure condition ($P_i=1$)
      * Outlet          : imposed pressure condition ($P_o=0$)
      * Wall conditions : usual no-slip conditions on walls
      
  - **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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==== Data features ====
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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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==== Database organisation ====
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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 [[https://sunfluidh.limsi.fr| wiki doc of Sunfluidh]]

=== Directories & files ===

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