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

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Simulation settings

2D Sketch

Referential : cartesian geometry

axes :

x : downstream direction

y : normal direction

z : spanwise direction

origin :

: upstream edge of Ahmed body top

: Ahmed body top

: mid-span of domain

Reference scales

Density : mass density of the fluid ()

Length : Ahmed body height ()

Velocity : inlet bulk velocity ()

Dynamic viscosity : dynamic viscosity of the fluid ()

Reynolds number :

Non-dimensionalised data

velocity :

density :

coordinates : , ,

Computational domain

Domain scope

Downstream direction(x) :

Normal direction (y) :

Spanwise direction (z) :

Ahmed body size :

Quarter rounded edges radius around the front face of the body :

Ground clearance :

Boundary conditions

Inlet : Uniform profile at

Outlet : Orlansky's type at

Wall conditions : Ahmed body, top and low walls of the domain

Symmetry : lateral ends of the domain

Spatial resolution :

Grid : (33.554.432 cells)

About cell-size

(downstream direction)

(normal direction)

(spanwise direction)

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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= time unit

Time range : 71 to 303 and 343 to 353 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 638 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 1084

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 633 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 59

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Database organisation

Data size : ~ 609 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
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_t318.tar, save_t518.tar, save_t638.tar
contains any file to resume the simulation at time = 318, 518 and 638 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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