A family of 5 grids in plot3d format are included in the tar file.
These grids are in plot3d, double prevision, unformatted, multi-block, little-endian format w/o iblank
These grids were generated and made available by JAXA.  
JAXA POCs: Dr. Mitsuhiro Murayama (murayama.mitsuhiro@jaxa.jp) and Dr. Kazuomi Yamamoto (kazuomi@chofu.jaxa.jp)
The README document provided by JAXA is included below.
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30P30N grid (Rev.1)			Jun 16, 2015

  Dimension
    Chord : 18 inch
    Span  :  2 inch (@ 3-D data)

  # of blocks
    117

  Grid Level
    L1 : coarse		(~x2.0 size of cells in each direction)
    L2 : medium		(~x1.5 size of cells in each direction)
    L3 : fine		( x1.0 = Baseline Grid)
    L4 : extra-fine	(~x1/1.5 size of cells in each direction)
    L5 : super-fine	(~x1/2.0 size of cells in each direction)

  # of points (cells) in 2-D domain
    L1 :    69,887 (   63,957)
    L2 :   120,292 (  112,474)
    L3 :   272,759 (  260,909)
    L4 :   600,889 (  583,226)
    L5 : 1,067,219 (1,043,636)

  # of points (cells) in span direction
    L1 : 136 (135)
    L2 : 181 (180)
    L3 : 271 (270)
    L4 : 406 (405)
    L5 : 541 (540)

  # of total points (cells) in 3-D volume
    L1 :   9,504,632 (  8,634,195)
    L2 :  21,772,852 ( 20,245,320)
    L3 :  73,917,689 ( 70,445,430)
    L4 : 243,960,934 (236,206,530)
    L5 : 577,365,479 (563,563,440)

  Initial spacing normal to viscous walls (inch)
    L1 : ~2.6E-04
    L2 : ~2.0E-04
    L3 : ~1.3E-04
    L4 : ~8.7E-05
    L5 : ~6.5E-05

  Max. Error in the connection of inter block
    L1 : ~6.4E-08
    L2 : ~2.3E-07
    L3 : ~8.0E-15
    L4 : ~4.2E-07
    L5 : ~6.3E-08

  File Format
    PLOT3D : DP-Unformatted, Multi-block, Little-endian, w/o iblank
      3-D Planes (Kmax = 1) @ 2-D domain file
      3-D Whole  (Kmax > 1) @ 3-D volume file
    Tecplot : Binary