datasetmeca:chflow_2
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Table des matières
3D turbulent channel flow at $Re_{\tau}= 180$
Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : June 2020
Location : DATABASE_CHANNELFLOW_RETAU180_DNS
Simulation type : DNS (Sunfluidh code)
Simulation settings
2D sketch
Referential : cartesian geometry
- axes :
- x(i) : downstream direction
- y(j) : normal direction
- z(k) : spanwise 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 : $Re_H= \frac{\rho_0.u_*.h}{\mu_0}= 180$
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) : $L_x^*= 2\pi$
- Normal direction (y) : $H^*= 2.0$
- Spanwise direction (z) : $l^*= \pi$
- Boundary conditions
- Wall conditions : Top and low walls of the domain
- Periodicity : lateral ends of the domain in $x$ and $z$ directions
- Spatial resolution :
- Grid : $96 \times 128 \times 96$ per subdomain (1.179.648 cells over the domain)
- About cell-size
- $\Delta x_{min}^*= \Delta x_{max}^*= 6.545 \,10^{-2}$ (downstream direction)
- $\Delta y_{min}^*= 2.780\, 10^{-4} \quad \Delta y_{max}^*= 3.088 \,10^{-2}$ (normal direction)
- $\Delta z_{min}^*= \Delta z_{max}^*= 3.2725 \, 10^{-2}$ (normal direction)
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)
- 7 probes
- Time step= 0.0126 time unit
- Time range : 97.09 to 301.09 time units
- Locations (In vertical plan at $z=1.57$)
- Xi= 3.14, Xj= 0.25 , Xk= 1.57
- Xi= 3.14, Xj= 0.75 , Xk= 1.57
- Xi= 3.14, Xj= 1.00 , Xk= 1.57
- Xi= 3.14, Xj= 1.25 , Xk= 1.57
- Xi= 3.14, Xj= 1.50 , Xk= 1.57
- Xi= 3.14, Xj= 1.75 , Xk= 1.57
- File name (per physical quantity): x_ins_00000.d with x= u,v,w,p
- 3D snapshots
- 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 97.39 to 301.09 time units
- File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
- MPI subdomain ID: 0
- Time ID : from 11 to 690
- Statistics
- fields : (i,j : indexes of direction x, y or z)
- Mean fields of velocity components (<Ui>) and pressure (<P>)
- Mean fields of quadratic quantities (<P2>, <UiUj>)
- Time average computation
- Time startup = 100.0 time units
- Time range per file = 25.0 time units
- Total time range from 100.0 to 300 time units
- file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
- MPI subdomain ID : 0
- Time ID : from 1 to 35
Database organisation
Data size : ~ 5.1 To
Main directory : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_CHANNELFLOW_RETAU590_LES
For more details about files, see the 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 301.09 /FROM_COMPUTATION : regroups some files related to the simulation : checkcalc_00000.dat and checkdata_00000.dat
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datasetmeca/chflow_2.1606141253.txt.gz · Dernière modification : 2020/11/23 15:20 de yann