===== 3D turbulent channel flow at $Re_{\tau}= 590$ ===== **Author** : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@lisn.fr) \\ **Date** : May 2017\\ **Simulation type** : LES, Mansour's model ([[https://sunfluidh.lisn.upsaclay.fr|Sunfluidh code]]) \\ **Location** : DATABASE_CHANNELFLOW_RETAU590_LES \\ ** Status ** : Restricted access \\ **Data size** : ~ 5.1 Tb \\ {{:datasetmeca:chflow_ret590.png?900|}} \\ [[:start|Come back to first page]] ----- ==== Simulation settings ==== ---- === 2D sketch === {{ :datasetmeca:sketch_chflow.jpg?800 |}} === Referential : cartesian geometry === - axes : * x(i) : downstream direction * y(j) : spanwise direction * z(k) : normal direction - origin : * $x_0= 0$ : left down corner * $y_0= 0$ : left down corner * $z_0= 0$ : left down corner === Reference scales === * Density : mass density of the fluid ($\rho_0$) * Length : half height of the channel ($h=\frac{H}{2}=1$) * Velocity : wall friction velocity ($u_*$) * Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$) * Reynolds number : $Re_H= \frac{\rho_0.u_*.h}{\mu_0}= 590$ === Non-dimensionalised data === * velocity : $U^*=\frac{U}{u_*}$ * 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) : $L_x^*= 2\pi$ * Spanwise direction (y) : $l^*= \pi$ * Normal direction (z) : $H^*= 2.0$ - **Boundary conditions** * Wall conditions : Top and low walls of the domain * Periodicity : lateral ends of the domain in $x$ and $y$ directions - **Domain decomposition** (128 MPI subdomains) * Along the downstream direction : 8 * Along the normal direction : 4 * Along the spanwise direction : 4 - **Spatial resolution** * Grid : $32 \times 64 \times 64$ per subdomain (16.777.216 cells over the domain) * About cell-size * $\Delta x_{min}^*= \Delta x_{max}^*= 2.45437 \,10^{-2}$ (downstream direction) * $\Delta y_{min}^*= \Delta y_{max}^*= 1.22718 \,10^{-2}$ (spanwise direction) * $\Delta z_{min}^*= 6\, 10^{-4} \quad \Delta z_{max}^*= 1.92765 \, 10^{-2}$ (normal direction) [[:start|Come back to first page]] ---- ==== Data Recording : information about data types ==== ---- * **Time series from probes** * Physical quantities : velocity components along x, y and z directions (u,v,w) and pressure (p) * 9 probes * Time step= 0.001 time unit * Time range : 16.64 to 199.44 time units * Locations (In vertical plan at $y=1.0$) * Xi= 1.00, Xj= 1.00 , Xk= 0.10 - MPI Subdomain ID : 20 * Xi= 1.00, Xj= 1.00 , Xk= 0.25 - MPI Subdomain ID : 21 * Xi= 1.00, Xj= 1.00 , Xk= 0.50 - MPI Subdomain ID : 21 * Xi= 1.00, Xj= 1.00 , Xk= 0.75 - MPI Subdomain ID : 21 * Xi= 1.00, Xj= 1.00 , Xk= 1.00 - MPI Subdomain ID : 21 * Xi= 1.00, Xj= 1.00 , Xk= 1.25 - MPI Subdomain ID : 22 * Xi= 1.00, Xj= 1.00 , Xk= 1.50 - MPI Subdomain ID : 22 * Xi= 1.00, Xj= 1.00 , Xk= 1.75 - MPI Subdomain ID : 22 * Xi= 1.00, Xj= 1.00 , Xk= 1.90 - MPI Subdomain ID : 23 * 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 : 0.01 time units * Time range from from 16.64 to 199.44 * File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID: from 0 to 127 * Time ID : from 9 to 18288 * **Statistics** * fields : (i,j : indexes of direction x, y or z) * Mean fields of velocity components () and pressure (

) * Mean fields of quadratic quantities (, ) * Mean field of subgrid scale dynamic viscosity (mu_sg) * Mean field of square mu_sg (musg2) * Time average computation * Time startup = 20.0 * Time range per file = 5.0 * Total time range from 20.0 to 199.44 * file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID) * MPI subdomain ID : from 0 to 127 * Time ID : from 1 to 35 ---- ==== Database organisation ==== ---- **Data size** : ~ 5.1 Tb \\ **Main directory** : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_CHANNELFLOW_RETAU590_LES \\ 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 /TIMESERIES : contains time series recorded over the time range [16.64 ; 199.44] 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 5 to 50) /SNAPSHOTS : snapshots binary files res_xxxxx_yyyyyyy.d 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 35) /RESTART_AR : backup/restart archive save.tar at time 199.44 /FROM_COMPUTATION : regroups some directories and files related to the simulation directories : CAS-MPI128-n with n= 5 to 50 (from simulation 5 to 50) each directory contains files checkcalc_00000.dat and checkdata_00000.dat [[:start|Come back to first page]]