datasetmeca:bfsflow_1
Ceci est une ancienne révision du document !
Table des matières
3D backward-facing step flow at $Re_H= 6000$
Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : August 2020
Location : DATABASE_BACKWARDFACINGSTEPFLOW_RE6000_DNS
Simulation type : DNS (Sunfluidh code)
Simulation settings
Sketch
Referential : cartesian geometry
- axes :
- x(i) : downstream direction
- y(j) : normal direction
- z(k) : spanwise direction
- origin :
- $x_0= 0$ : the step
- $y_0= 0$ : the bottom wall of the domain
- $z_0= 0$ : the left side of the computational domain
Reference scales
- Density : mass density of the fluid ($\rho_0$)
- Length : step height ($H$)
- Velocity : inlet bulk velocity ($U_i$)
- Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
- Reynolds number : $Re_H= \frac{\rho_0.U0.H}{\mu_0}= 6000$
Non-dimensionalised data
- velocity : $U^*=\frac{U}{U_i}$
- 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) : $L^*= 36.0$
- Normal direction (y) : $H_t^*= 2.0$
- Spanwise direction (z) : $l^*= 2\pi$
- Step position : $L_s^*= 12.0$
- Step height : $H^*= 1$
- Boundary conditions
- Inlet : Uniform profil at $X_{in}^*= -12.0$
- Outlet : Orlansky's type at $X_{out}^*= 24.0$
- Wall conditions : Top and low walls of the domain
- Periodicity : lateral ends of the domain
- Domain decomposition (160 MPI subdomains)
- Along the downstream direction :
- 12 (between the inlet and the outlet, above the step)
- 8 (between the step and the outlet)
- Along the normal direction : 4
- Along the spanwise direction : 4
- 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
0 0 0 0 1 1 1 1 1 1 1 1
0 0 0 0 1 1 1 1 1 1 1 1
- Spatial resolution :
- Grid : $128 \times 64 \times 64$ per subdomain (83.886.080 cells over the domain)
- About cell-size
- $\Delta x_{min}^*= 1.0 \, 10^{-3} \quad \Delta x_{max}^*= 2.456 \,10^{-2}$ (downstream direction)
- $\Delta y_{min}^*= 1.1 \, 10^{-3} \quad \Delta y_{max}^*= 1.653 \,10^{-2}$ (normal direction)
- $\Delta z_{min}^*=\Delta z_{max}^*= 2.4543 \, 10^{-3}$ (spanwise direction)
Data Recording : information about data types
- Time series from probes : U,V,W,P (velocity components & pressure)
- Time step= 0.01
- Time range : 200.0 to 513.3 time units
- Locations (In vertical plan at $z=3.14$)
- Xi=-4.00 , Xj= 1.50 , Xk= 3.14 17
- Xi=-2.00 , Xj= 1.50 , Xk= 3.14 - MPI Subdomain ID : 25
- Xi= 0.10 , Xj= 1.00 , Xk= 3.14 - MPI Subdomain ID : 37
- Xi= 4.00 , Xj= 1.00 , Xk= 3.14 - MPI Subdomain ID : 53
- Xi= 4.00 , Xj= 0.01 , Xk= 3.14 - MPI Subdomain ID : 49
- Xi= 6.00 , Xj= 1.00 , Xk= 3.14 - MPI Subdomain ID : 69
- Xi= 6.00 , Xj= 0.01 , Xk= 3.14 - MPI Subdomain ID : 65
- Xi= 8.00 , Xj= 1.00 , Xk= 3.14 - MPI Subdomain ID : 69
- Xi= 8.00 , Xj= 0.01 , Xk= 3.14 - MPI Subdomain ID : 65
- Xi=16.0 , Xj= 1.00 , Xk= 3.14 - MPI Subdomain ID : 117
- Xi=16.0 , Xj= 0.01 , Xk= 3.14 - MPI Subdomain ID : 113
- File name : x_ins_yyyyy.d with x= u,v,w,p and 'yyyyy' the MPI subdomain ID
- 3D snapshots (instantaneous fields : velocity components U,V,W and pressure : P)
- Recording rate : 0.1 time units
- Time range from from 185.3 to 513.3
- File name : res_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
- MPI subdomain ID: from 0 to 159
- Time ID : from 186 to 3465
- Statistics (fields : <Ui>, <P>, <P2>, <UiUj> i,j : directions x,y,z)
- Time and space average computation (along the spanwise direction)
- Time startup = 180.0
- Time range per file = 10.0
- Total time range from 180.0 to 510.0
- file name : rst_xxxxx_yyyyyyy.d (xxxxx : MPI subdomain ID, yyyyyyy : Time ID)
- MPI subdomain ID : from 0 to 39 (MPI process rank where results about space average computation are stored)
- Time ID : from 1 to 33
Database organisation
Data size : ~ 4.4 To
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 [200,513.3] ASCII files : x_ins_yyyyy.d with x= u,v,w,p time series files are sliced in directories CAS-MPI160-n (n from 121 to 330) WARNING : possible underlying of time series for these data couples : n = (243,244): n = (246,247): n = (259,260): n = (260-261): The directory CAS-MPI160-260 contains 2 groups of consecutive timeseries files placed in directories DIR-A and DIR-B /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 : rst_z.tar , z is an ID number /RESTART_AR : backup/restart archive save.tar at time 513.27
Traductions de cette page:
- fr
datasetmeca/bfsflow_1.1603544434.txt.gz · Dernière modification : 2020/10/24 15:00 de yann