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)

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Simulation settings

2D sketch

Referential : cartesian geometry

axes :

x(i) : downstream direction

y(j) : normal direction

z(k) : spanwise direction

origin :

: left down corner

: left down corner

: left down corner

Reference scales

Density : mass density of the fluid ()

Length : half height of the channel ()

Velocity : wall friction 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) :

Boundary conditions

Wall conditions : Top and low walls of the domain

Periodicity : lateral ends of the domain in and directions

Spatial resolution :

Grid : per subdomain (1.179.648 cells over the domain)

About cell-size

(downstream direction)

(normal direction)

(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 )

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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