===== 3D AHMED-BODY FLOW at $Re_H= 10000$ ===== **Author** : Y. Fraigneau, LISN, UMR CNRS 9015 (yann.fraigneau@lisn.fr) \\ **Date** : July 2018\\ **Simulation type** : DNS (code Sunfluidh [[https://sunfluidh.lisn.upsaclay.fr|Sunfluidh code]]) \\ **Location** : DATABASE_AHMEDBODY_RE10000_DNS \\ ** Status ** : Restricted access \\ **Data size** : ~ 609 Gb \\ {{ :datasetmeca:fig_ahmedbody_snapshot.png?1000 |}} [[https://sunfluidh.lisn.upsaclay.fr/doku.php?id=sunfluidh:sunfluidh_gallery#_dmovie_cav3d_r2_re7826_fsview_mq.mp4| Videos are available here ]] [[:start | Come back to first page]] ----- ==== Simulation settings ==== ---- === 2D Sketch === {{ :datasetmeca:ahmedbody_sketch.jpg?800 |}} === Referential : cartesian geometry === - axes : * x : downstream direction * y : normal direction * z : spanwise direction - origin : * $x_0= 0$ : upstream edge of Ahmed body top * $y_0= 0$ : Ahmed body top * $z_0= 0$ : mid-span of domain === Reference scales === * Density : mass density of the fluid ($\rho_0$) * Length : Ahmed body height ($H$) * Velocity : inlet bulk velocity ($U_0$) * Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$) * Reynolds number : $Re_H= \frac{\rho_0.U_0.H}{\mu_0}= 10000$ === Non-dimensionalised data === * velocity : $U^*=\frac{U}{U_0}$ * density : $\rho^*= \rho/\rho_0= 1$ * coordinates : $x*=\frac{x}{H}$, $y^*=\frac{y}{H}$ , $z^*=\frac{z}{H}$ === Computational domain === - **Domain scope** * Downstream direction(x) : $L_t^*= 10.5$ * Normal direction (y) : $H_t^*= 2.5$ * Spanwise direction (z) : $W_t^*= 3.718$ * Ahmed body size : $L^*\times W^*\times H^* = 3.784 \times 1.178 \times 1$ * Quarter rounded edges radius around the front face of the body : $R^*=0.347$ * Ground clearance : $Hg^*= 0.334$ - **Boundary conditions** * Inlet : Uniform profile at $X_{in}^*= -1.0$ * Outlet : Orlansky's type at $X_{out}^*= 9.5$ * Wall conditions : Ahmed body, top and low walls of the domain * Symmetry : lateral ends of the domain - **Spatial resolution** : * Grid : $512 \times 256 \times 256$ (33.554.432 cells) * About cell-size * $\Delta x_{min}^*= 1 \, 10^{-2} \quad \Delta x_{max}^*= 3.03588 \,10^{-2}$ (downstream direction) * $\Delta y_{min}^*= 2 \, 10^{-3} \quad \Delta y_{max}^*= 4.12564 \,10^{-2}$ (normal direction) * $\Delta z_{min}^*= 2 \, 10^{-3} \quad \Delta z_{max}^*= 4.59486 \,10^{-2}$ (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) * 3 probes * Time step= $5.5 \,10^{-3}$ time unit * Time range : 71 to 303, 343 to 680, 680 to 729, 729 to 780 time units * Locations (In horizontal mid-plan of the body wake) * Xi= 4.384 , Xj=-0.5 , Xk= 0.3 * Xi= 4.384 , Xj=-0.5 , Xk= 0.0 * Xi= 4.384 , Xj=-0.5 , Xk=-0.3 * File name (per physical quantity): x_ins_00000.d with x= u,v,w,p * **3D snapshots** * Instantaneous fields : velocity components along x,y and z directions (U,V,W) and pressure (P) * Recording rate : 0.5 time unit * Time range from from 185 to 780 time units * File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID= 0 (No domain decomposition) * Time ID : 178 to 1364 * **Statistics** * fields : (i,j : indexes of direction x, y or z) * Mean fields of velocity components () and pressure (

) * Mean fields of quadratic quantities (, ) * Time startup = 43 time units * Time range per file = 10 time units * Total time range from 43 to 780 time units * file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID= 0 (No domain decomposition) * Time ID : 1 to 73 [[:start|Come back to first page]] ---- ==== Database organisation ==== ---- **Data size** : ~ 802 Gb \\ **Main directory** : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_AHMEDBODY_RE10000_DNS \\ For more details about files, see the [[https://sunfluidh.limsi.fr| wiki doc of Sunfluidh]] === Directories & files === /GRID : contains all 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 : it contains input data file for sunfluidh : input3d.dat /TIMESERIES : contains time series recorded from probes /TIMESERIES_T071-305 : from time= 71 to 303 time units /TIMESERIES_T343-533 : from time=343 to 533 time units /TIMESERIES_T533-638 : from time=533 to 638 time units /TIMESERIES_T638-680 : from time=638 to 680 time units /TIMESERIES_T680-729 : from time=680 to 729 time units /TIMESERIES_T729-780 : from time=729 to 780 time units ASCII files : x_ins_00000_full.d with x= u,v,w,p also contains the space-averaged kinetic energy from time=326 to 561 (time step : 2.55D-02) ASCII file : space_averaged_ke.d /SNAPSHOTS : snapshots binary files res_xxxxx_yyyyyyy.d /STATISTICS : statistics binary files rst_xxxxx_yyyyyyy.d /RESTART_AR : backup/restart archives save_t361.tar, save_t561.tar, save_t638.tar, save_t729.tar, save_t780.tar contains any file to resume the simulation at time = 361, 561, 638, 729 and 780 time units /FROM_COMPUTATION : regroup some directories and files related to the simulation /SLICES : slices ... not documented (old study) Binary files : plan_id_dir_xxxxx_yyyyyyy.d (nn : slice ID, dir : orientation, xxxxx : MPI subdomain ID, yyyyyyy : Time ID) [[:start|Come back to first page]]