Direct Numerical Simulation of Turbulent Flows [RSS] [CSV]

```
\=======================================================================  
            INFORMATION ABOUT THE DNS DATABASE  
         (HDF5 FILES)  
\=======================================================================  
  
This directory tree contain some of the restart files of a direct   
numerical simulations of fully developed ZPG Boundary Layer flow   
(Re\_theta=2780-6650). Details are offered below.  
  
The algorithm used is presented in:   
  
\- M. P. Simens, J. Jimenez, S. Hoyas, Y. Mizuno  
  "A high-resolution code for turbulent boundary layers"  
  Journal of Computational Physics  
  Volume 228, Issue 11, 20 June 2009, Pages 4218-4231   
  
\- G. Borrell, J.A. Sillero, J. Jimenez   
  "A code for direct numerical simulation of turbulent boundary layers    
  at high Reynolds numbers in BG/P supercomputers"   
  Computers & Fluids, Volume 80, 10 July 2013, Pages 37-43   
  
  
The data is discussed in:  
  
\- J.A. Sillero, J. Jimenez, R.D. Moser   
  "One-point statistics for turbulent wall-bounded flows at Reynolds   
  numbers up to \\delta^+\\approx2000"    
  Phys. Fluids 25, 105102   
  
  
\-----------------------------------------------------------------------  
                     STRUCTURE OF THE FILES:  
\-----------------------------------------------------------------------  
  
The files are written in HDF5 format, which is supported by most of the   
mathematical programs. For programming languages, libraries can be   
downloaded for C, C++, Fortran 90, and Java interfaces.  
  
The primitive variables {u,v,w,p} are stored in Fourier space as:  
(kz,ny,nx) ---> ( Fourier - Physical -Physical )  
  
For instance, one file contains:  
  
Re        Dataset {1} : Inverse of the viscosity used in the code,  
          which defines the scaling in which the code works.  
Variable  Dataset {SCALAR} : Variable recorded "u", "v", "w" or "p".  
procs     Dataset {536}   : Number of nodes used to run the simulation.  
           (first element of the vector!)  
  
cfl       Dataset {1}    : Courant?Friedrichs?Lewy condition at which the  
        simulation was run.   
dt        Dataset {1}    : Time step in code units for this flow realization.  
tiempo    Dataset {1}    : Time stamp in code units for this flow realization.  
timeinit  Dataset {1} : Initial time stamp in code units (=0).  
  
lx        Dataset {1}    : Defines the streamwise length Lx of the box, in code units.  
ly        Dataset {1}    : Defines the wall-normal length Ly of the box, in code units.  
lz        Dataset {1}    : Defines the spanwise length Lz of the box, in code units.  
nx        Dataset {1}    : Number of collocation points in the streamwise direction.  
ny        Dataset {1}    : Number of collocation points in the wall-normal direction.  
nz2       Dataset {1}    : Half the number of complex Fourier Gallerkin modes in z-> K\_z\[0:nz2\]  
  
We use the 2/3 dealiasing rule in z, so the number of collocation points in those directions are 3/2   
times the number of Fourier Gallerkin modes, and the extra modes are padded with zeroes.   
                       
  
xout      Dataset {1}        : Location of the recycling plane.  
um        Dataset {536} : Mean streamwise velocity profile in code units at the recycling  
             station "xout".  
y         Dataset {537} : Non-uniform grid for the wall-normal distance; in code units.  
              Note that, because of the staggered grid: y=(-y1,0,y1,y2,....)  
value     Dataset {15361, 536, 2730} : Primitive variable in code units. The array is stored in single-precision  
           as \[1:2\*(nz2+1),1:Ny,1:Nx\], equivalent to the complex array \[Kz,Ny,Nx\]  
     
SKETCH:   
  
            ------v2------      \* y(3)=y1  
            |            |  
   u2-----> x    o w2,p2 x ----->   
            |            |          
            |            |             
\==================v1=========== \* ======== y(2)=0;  
            |            |          
            |            |          
   u1-----> x    o w1,p1 x ----->        
            |            |  
            --------------      \* y(1)=-y1  
  
  
Before final publication of a paper citing these data, please check this  
site (http://torroja.dmt.upm.es/turbdata/blayers/high\_re) for an up-to-date reference.  
  
Please report any problems with the data, queries or doubts to J.A. Sillero,   
sillero@torroja.dmt.upm.es
```