datasetmeca:ahmedbody_1
Ceci est une ancienne révision du document !
Table des matières
3D AHMED-BODY FLOW at $Re_H= 10000$
Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : July 2018
Simulation type : DNS (Sunfluidh code)
Location : DATABASE_AHMEDBODY_RE10000_DNS
Status : Restricted access
Data size : ~ 609 Gb
Simulation settings
2D Sketch
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)
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 (<Ui>) and pressure (<P>)
- Mean fields of quadratic quantities (<P2>, <UiUj>)
- 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
Database organisation
Data size : ~ 802 Gb
Main directory : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_AHMEDBODY_RE10000_DNS
For more details about files, see the 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)
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datasetmeca/ahmedbody_1.1639578404.txt.gz · Dernière modification : 2021/12/15 15:26 de yann