3D forward-facing step flow at $Re_H= 8000$

Database in progress … it is currently uncompleted

Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : August 2020
Simulation type : DNS (Sunfluidh code)
Location : DATABASE_FORWARDFACINGSTEPFLOW1_RE8000_DNS
Status : Restricted access
Data size : ~ 3.2 Tb

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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 :

: the step

: the bottom wall of the domain

: the left side of the computational domain

Reference scales

Density : mass density of the fluid ()

Length : step 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) :

Step position :

Step height :

Boundary conditions

Inlet : Blasius' profile at , (boundary layer's thickness)

Outlet : Orlansky's type at

Wall conditions : Top and low walls of the domain

Periodicity : lateral ends of the domain

Domain decomposition (200 MPI subdomains)

Along the downstream direction :

15 (between the inlet and the outlet, above the step)

10 (between the inlet and the step)

Along the normal direction : 4

Along the spanwise direction : 4

2D sketch of domain decomposition in a plan {xy} (MPI process distribution (1))
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 0 0 0 0 0 0 0 0 0 0

Spatial resolution

Grid : per subdomain (471.859.200 cells over the domain)

About cell-size

(downstream direction)

(normal direction)

(spanwise direction)

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Data features

Time series from probes : U,V,W,P (velocity components & pressure)

Physical quantities : velocity components along x, y and z directions (u,v,w) and pressure (p)

5 probes

Time step= 0.0126 time unit

Time range : 188.37 to 396.87 time units

Locations (In vertical plan at )

Xi=-0.250 , Xj= 0.250 , Xk= 1.57 - MPI Subdomain ID :

Xi= 0.125 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID :

Xi= 1.000 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID :

Xi= 1.000 , Xj= 1.250 , Xk= 1.57 - MPI Subdomain ID :

Xi= 4.000 , Xj= 1.125 , Xk= 1.57 - MPI Subdomain ID :

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)

first dataset :

Recording rate : 0.9 time units

Time range from 189.877 to 303.877 time units

File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)

MPI subdomain ID: from 0 to 199

Time ID : from 69 to 195

second dataset :

Recording rate : 0.3 time units

Time range from 303.877 to 396.877 time units

File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)

MPI subdomain ID: from 196 to 199

Time ID : from 196 to 505

2D slices

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 from 189.877 to 396.877 time units

3 slices are considered :

slice 1 : normal direction k - position : z= 1.57 - MPI subdomains ID :

slice 2 : normal direction x - position : x=-0.01 - MPI subdomains ID :

slice 3 : normal direction y - position : y= 1.30

MPI subdomains ID : 4 to 7

MPI subdomains ID : 20 to 23

MPI subdomains ID : 36 to 39

MPI subdomains ID : 52 to 55

MPI subdomains ID : 68 to 71

MPI subdomains ID : 80 to 83

MPI subdomains ID : 92 to 95

MPI subdomains ID :104 to 107

MPI subdomains ID :116 to 119

MPI subdomains ID :128 to 131

MPI subdomains ID :140 to 143

MPI subdomains ID :152 to 155

MPI subdomains ID :164 to 167

MPI subdomains ID :176 to 179

MPI subdomains ID :188 to 191

File name : slice_n_idir_xxxxx_yyyyyyy.d (n : slice number ID, idir : direction= 1: x(i), 2: y(j), 3: z(k), xxxxx : MPI subdomain ID, yyyyyyy : Time ID)

MPI subdomain ID: ??

Time ID : from 748 to ??

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 and space average computation (along the spanwise direction)

Time startup = 200.0 time units

Time range per file = 10.0 time units

Total time range from 200.0 to 390 time units

file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)

MPI subdomain ID : from 0 to 49 (MPI process rank where results about space average computation are stored)

Time ID : from 1 to 19

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Database organisation

Data size : ~ 3.2 Tb
Main directory : /vol/DATABASE_MECA/RESTRICTED_ACCESS/DATABASE_BACKFACINGSTEPFLOW_RE6000_DNS
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
data file for MPI subdomain distribution (MPI graphical topology): data_mpi_subdomain_layout.dat
/TIMESERIES : contains time series recorded over the time range [188.37,??]
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 130 to ??)
/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 ??)
/SLICES : slice binary files slice_n_idir_xxxxx_yyyyyyy.d
files stored in archive files : slices_z.tar , z is an ID number (from 131 to ??)
/RESTART_AR : backup/restart archive save.tar at time ??

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