# CFD DATABASE

### Outils du site

datasetmeca:jetoscillatingbodies

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

The motion of bodies is vertical and forced with a sinusoïdal function
Three different frequencies are considered

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

### Simulation settings

#### 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 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

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)
• $\Delta x*= 0.0333$ (downstream direction)
• $\Delta y*= 0.0125$ (normal direction)
• $\Delta z*=0.0250$ (spanwise direction)

### Data features

• 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

### Database organisation

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

#### Directories & files


/DATASETUP       : ASCII files

input data file for sunfluidh : input3d.dat

/SNAPSHOTS  : snapshots binary files res_xxxxx_yyyyyyy.d

datasetmeca/jetoscillatingbodies.txt · Dernière modification: 2020/11/23 18:11 de yann

### Outils de la page 