===== 3D shear-layer driven cavity flow at $Re_{L_c}= 7826$ ===== **Author** : Y. Fraigneau, LISN, UMR CNRS 9015 (yann.fraigneau@lisn.fr) \\ **Date** : July 2020\\ **Simulation type** : DNS (code Sunfluidh -- [[https://sunfluidh.lisn.upsaclay.fr|Sunfluidh code]]) \\ **Location** : DATABASE_CAVITY3D_R2_RE7826_PER1.0_DNS/NOFORCINGTERM \\ **Status** : Free access for laboratory members, on request for external members \\ **Data size** : ~ 31 Gb \\ {{ :datasetmeca:cav_re7826_isoq_noforce.png?900 |}} [[https://sunfluidh.lisn.upsaclay.fr/doku.php?id=sunfluidh:sunfluidh_gallery| A video is available here ]] [[:start|Come back to first page]] ----- ==== Simulation settings ==== ---- === 2D sketch === {{ :datasetmeca:sketch_cav_r2.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 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 === - **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 : $H_c^*= 0.5$ - **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 - **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) [[:start|Come back to first page]] ---- ==== 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 () and pressure (

) * Mean fields of quadratic quantities (, ) * 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 [[:start|Come back to first page]] ---- ==== 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 [[https://sunfluidh.limsi.fr| 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 [[:start|Come back to first page]]