Index of /channels/data/spectra/re2000/2D

[ICO]NameLast modifiedSizeDescription
[PARENTDIR]Parent Directory   -  
[ ]Re2000.spe.j01 2011-06-20 14:09 96M 
[ ]Re2000.spe.j02 2011-06-20 14:09 96M 
[ ]Re2000.spe.j03 2011-06-20 14:10 96M 
[ ]Re2000.spe.j04 2011-06-20 14:10 96M 
[ ]Re2000.spe.j05 2011-06-20 14:10 96M 
[ ]Re2000.spe.j06 2011-06-20 14:10 96M 
[ ]Re2000.spe.j07 2011-06-20 14:10 96M 
[ ]Re2000.spe.j08 2011-06-20 14:10 96M 
[ ]Re2000.spe.j09 2011-06-20 14:10 96M 
[ ]Re2000.spe.j10 2011-06-20 14:11 96M 
[ ]Re2000.spe.j11 2011-06-20 14:11 96M 
[ ]Re2000.spe.j12 2011-06-20 14:11 96M 
[ ]Re2000.spe.j13 2011-06-20 14:11 96M 
[ ]Re2000.spe.j14 2011-06-20 14:11 96M 
[ ]Re2000.spe.j15 2011-06-20 14:11 96M 
[ ]Re2000.spe.j16 2011-06-20 14:11 96M 
[ ]Re2000.spe.j17 2011-06-20 14:12 96M 
[ ]Re2000.spe.j18 2011-06-20 14:12 96M 
[ ]Re2000.spe.j19 2011-06-20 14:12 96M 
[ ]Re2000.spe.j20 2011-06-20 14:12 96M 
[TXT]spsumm.2000.txt 2011-06-20 14:12 1.1K 
-----------------------------------------------------------------------
-----------------------------------------------------------------------
            INFORMATION ABOUT THE RE2000 2D SPECTRA FILES
-----------------------------------------------------------------------
-----------------------------------------------------------------------

There are 20 files, 

Re2000.spe.j??   ---> Spectrum at heigth ??

FOR CONVENIENCE, some of the header information from all the spectra are
collected in the text file "spsumm.2000.txt", in this directory

----

The files are written in the standard BINARY FORTRAN UNFORMATTED fashion, and
the Byte ordering of each 4-Byte word is LITTLE ENDIAN.

We have stored the 2D spectra at different wall-distances.

If you try to read these files in MATLAB or C, take into account that IFORT adds 4
bytes at the end and beggining of each record

----

The 1st record is a header with the following information:

  utau,re,alp,bet,mx,my,mz,nplan,nacum,jind,nvar

  utau (4 Bytes real)    : Friction velocity in computational units
  re   (4 Bytes real)    : Reynolds number based on"some" bulk mean velocity
                           in the channel (actually 1/nu is comput. units).
  alp  (4 Bytes real)    : A parameter which gives the length
                           of the computational box. Lx/h=2*pi/alp.
  bet  (4 Bytes real)    : A parameter which gives the width 
                           of the computational box. Lz/h=2*pi/bet.
  mx   (4 Bytes integer) : Number of Fourier Galerkin modes in the
                           streamwise direction.
  my   (4 Bytes integer) : Number of grid points in the
                           wall-normal direction.
  mz   (4 Bytes integer) : Number of Fourier Galerkin modes in the
                           spanwise direction.
  nplan(4 Bytes integer) : Total number of spectral planes collected  

  nacum(4 Bytes integer) : Number of fields that have been accumulated to
                           average the spectra 
  jind (4 Bytes integer) : Index of spectrum in jsp (see 2nd record).

  nvar (4 Bytes integer) : Number of spectral quantities collected. In most cases
  			   seven, except for Re2000 where there are 8, see below)
----

The 2nd record is a header with the following information:

   (jsp(j), j=1,nplan) (4 Bytes integer): indexes corresponding to the
                                position in the grid of the planes of the spectra. 
                                The corresponding coordinates are  

   (y(j)/h, j=1,nplan) (4 Bytes real):  wall-normal coordinates of all spectra. 

----

The following nvar records have:

  ((sp(ix,iz),ix=1,nx1), iz=1,nz1) (4 Bytes real):
 
  2D spectrum at  y(jind)

  nx1=mx/2, nz1=(mz+1)/2

  and

  var = 1 -> uu
  var = 2 -> vv
  var = 3 -> ww
  var = 4 -> Re(u*v)
  var = 5 -> Ox*Ox
  var = 6 -> Oy*Oy
  var = 7 -> Oz*Oz

  var = 8 -> Im(u*v)  ONLY for Retau=2000 !!!

---
WARNING: The final spectra is sp = sp/nacum
----

If you use these data, please cite the following work:
S. Hoyas and J. Jim\'enez, Scaling of the velocity fluctuations in 
turbulent channels up to $Re_\tau=2003$, Phys. Fluids, 18:011702 (2006)

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						       sergio@torroja.dmt.upm.es
						      jimenez@torroja.dmt.upm.es