===== 3D forward-facing step flow at $Re_H= 8000$ (laminar inflow) ===== **Database in progress ... it is currently uncompleted** **Author** : Y. Fraigneau, LISN, UMR CNRS 9015 (yann.fraigneau@lisn.fr) \\ **Date** : August 2020\\ **Simulation type** : DNS (code Sunfluidh [[https://sunfluidh.lisn.upsaclay.fr|Sunfluidh code]]) \\ **Location** : DATABASE_FORWARDFACINGSTEPFLOW1_RE8000_DNS \\ **Status** : Restricted access \\ **Data size** : ~ 3.2 Tb {{:datasetmeca:flowstructure_ffs_pview.png?900|}} \\ [[:start|Come back to first page]] ----- ==== Simulation settings ==== ---- === 2D sketch === {{ :datasetmeca:ffs_sketch.jpg?800 |}} === Referential : cartesian geometry === - axes : * x(i) : downstream direction * y(j) : normal direction * z(k) : spanwise direction - origin : * $x_0= 0$ : the step * $y_0= 0$ : the bottom wall of the domain * $z_0= 0$ : the left side of the computational domain === Reference scales === * Density : mass density of the fluid ($\rho_0$) * Length : step height ($H$) * Velocity : inlet bulk velocity ($U_i$) * Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$) * Reynolds number : $Re_H= \frac{\rho_0.U_0.H}{\mu_0}= 8000$ === Non-dimensionalised data === * velocity : $U^*=\frac{U}{U_i}$ * 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) : $L^*= 34.0$ * Normal direction (y) : $H_t^*= 22.0$ * Spanwise direction (z) : $l^*= \pi$ * Step position : $L_s^*= 14.0$ * Step height : $H^*= 1$ - **Boundary conditions** * Inlet : Blasius' profile at $X_{in}^*= -14.0$, $\delta_{in}= \frac{H}{3}$ (boundary layer's thickness) * Outlet : Orlansky's type at $X_{out}^*= 20.0$ * Wall conditions : Top and low walls of the domain * Periodicity : lateral ends of the domain - ** Domain decomposition (200 MPI subdomains) ** * Along the downstream direction : * 15 (between the inlet and the outlet, above the step) * 10 (between the inlet and the step) * Along the normal direction : 4 * Along the spanwise direction : 4 * 2D sketch of domain decomposition in a plan {xy} (MPI process distribution (1)) \\ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 \\ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 \\ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 \\ 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 \\ - **Spatial resolution** * Grid : $128 \times 192 \times 96$ per subdomain (471.859.200 cells over the domain) * About cell-size * $\Delta x_{min}^*= 1.0 \, 10^{-2} \quad \Delta x_{max}^*= 2.5 \,10^{-2}$ (downstream direction) * $\Delta y_{min}^*= 1.5 \, 10^{-3} \quad \Delta y_{max}^*= 7.5 \,10^{-2}$ (normal direction) * $\Delta z_{min}^*=\Delta z_{max}^*= 8.18123 \, 10^{-3}$ (spanwise direction) [[:start|Come back to first page]] ---- ==== Data features ==== ---- * **Time series from probes** : U,V,W,P (velocity components & pressure) * Physical quantities : velocity components along x, y and z directions (u,v,w) and pressure (p) * 5 probes * Time step= 0.0126 time unit * Time range : 188.37 to 396.87 time units * Locations (In vertical plan at $z=1.57$) * Xi=-0.250 , Xj= 0.250 , Xk= 1.57 - MPI Subdomain ID : * Xi= 0.125 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID : * Xi= 1.000 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID : * Xi= 1.000 , Xj= 1.250 , Xk= 1.57 - MPI Subdomain ID : * Xi= 4.000 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID : * 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) * first dataset : * Recording rate : **0.9** time units * Time range from 189.877 to 303.877 time units * File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID: from 0 to 199 * Time ID : from 69 to 195 * second dataset : * Recording rate : **0.3** time units * Time range from 303.877 to 396.877 time units * File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID: from 196 to 199 * Time ID : from 196 to 505 * **2D slices** * Instantaneous fields : velocity components in x, y and z directions (U,V,W) and pressure (P) * Recording rate : 0.3 time units * Time range from from 189.877 to 396.877 time units * 3 slices are considered : * slice 1 : normal direction k - position : z= 1.57 - MPI subdomains ID : * MPI subdomains ID : 1 to 197 * slice 2 : normal direction x - position : x=-0.01 * MPI subdomains ID : 64 to 79 * slice 3 : normal direction y - position : y= 1.30 * MPI subdomains ID : 4 to 7 * MPI subdomains ID : 20 to 23 * MPI subdomains ID : 36 to 39 * MPI subdomains ID : 52 to 55 * MPI subdomains ID : 68 to 71 * MPI subdomains ID : 80 to 83 * MPI subdomains ID : 92 to 95 * MPI subdomains ID :104 to 107 * MPI subdomains ID :116 to 119 * MPI subdomains ID :128 to 131 * MPI subdomains ID :140 to 143 * MPI subdomains ID :152 to 155 * MPI subdomains ID :164 to 167 * MPI subdomains ID :176 to 179 * MPI subdomains ID :188 to 191 * File name : slice_n_idir_xxxxx_yyyyyyy.d (n : slice number ID, idir : direction= 1: x(i), 2: y(j), 3: z(k), xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * Time ID : from 753 to 1442 * **Statistics** * fields : (i,j : indexes of direction x, y or z) * Mean fields of velocity components () and pressure (

) * Mean fields of quadratic quantities (, ) * Time and space average computation (along the spanwise direction) * Time startup = 200.0 time units * Time range per file = 10.0 time units * Total time range from 200.0 to 390 time units * file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID : from 0 to 49 (MPI process rank where results about space average computation are stored) * Time ID : from 1 to 19 [[:start|Come back to first page]] ---- ==== Database organisation ==== ---- **Data size** : ~ 5.2 Tb \\ **Main directory** : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_FROWARDFACINGSTEPFLOW1_RE8000_DNS \\ For more details about files, see the [[https://sunfluidh.limsi.fr|the 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 data file for MPI subdomain distribution (MPI graphical topology): data_mpi_subdomain_layout.dat /TIMESERIES : contains time series recorded over the time range [188.37,??] ASCII files : x_ins_yyyyy.d with x= u,v,w,p time series files are sliced in storage directories CAS-MPI200-n (n from 130 to ??) /SNAPSHOTS : snapshots binary files res_xxxxx_yyyyyyy.d with a recording rate of 0.9 time unit files stored in archive files : res_yyyyyyy.tar for each time ID /SNAPSHOTS_FS : snapshots binary files res_xxxxx_yyyyyyy.d with a recording rate of 0.3 time unit files stored in archive files : res_yyyyyyy.tar for each time ID /STATISTICS : statistics binary files files rst_xxxxx_yyyyyyy.d files stored in archive files : res_z.tar , z is an ID number (from 1 to ??) /SLICES : slice binary files slice_n_idir_xxxxx_yyyyyyy.d files stored in archive files : slices_z.tar , z is an ID number (from 131 to ??) /RESTART_AR : backup/restart archive save.tar at time ?? [[:start|Come back to first page]]