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            DATA FROM DNS OF IMPINGING SHOCK WAVE BOUNDARY
                      LAYER INTERACTION (M = 2.28)
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This directory contains files where the spectrum of the wall pressure
fluctuations is stored. The spectrum is a function of both the frequency
and the streamwise coordinate x. Files are directly readable by Tecplot.

The parameters of the simulation are

Free-stream Mach number ====> M = 2.28
Reynolds number based on the inlet BL thickness ====> Re = 16750.
Incidence angle of the shock generator ====> phi = 8 degree
gamma = 1.4 

The spectrum is stored in formatted files named "wall_spectrum_ib.dat".
The index "ib" refers to a specific block of the grid.
The computational domain is subdivided into 64 blocks along the
stream-wise direction (x coordinate).
The overall size of the domain is 80.58 in the stream-wise direction (x).
The reference length is the boundary-layer thickness
at the inlet section (x=0).
Each block consists of nx = 61 points uniformly distributed in the x direction.
The last point of each block coincides with the first one of the following
block. Files can be read as

**************************************************************
                        FORTRAN CODE
**************************************************************
       open(unit=12,file='wall_spectrum_'//ib//'.dat',form='formatted')
       read(12,*)
       do j=1,nf
        do i=1,nx
         read(12,*) (spec(i,j,l),l=1,3)
        enddo
       enddo
       close  (12)
**************************************************************

where nf=61.
The variables in the array spec are the following

 m  variable
------------
 1  x (streamwise coordinate) 
 2  f (frequency)
 3  E(p) spectrum of wall pressure fluctuations

All variables are nondimensional. The reference velocity is taken
to be the free-stream values. Spectra are normalized in such a way that
their integral over frequency is unity for all x.