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Grids - 2D Fully-Developed Channel Flow at High Reynolds Number

A series of 5 nested grids are provided. All grid files have been gzipped. Each coarser grid is exactly every-other-point of the next finer grid, ranging from the finest 161 x 513 to the coarsest 11 x 33 grid. The following figure shows the the 41 x 129 grid (2 levels down from the finest grid). The grid is not drawn to scale (the vertical direction has been expanded for clarity).

Note: be sure to use double precision when reading the grids!

STRUCTURED VERSIONS OF GRIDS

PLOT3D Files

The structured PLOT3D grids are given in two different ways, as 2-D grids (x-y plane) or as 3-D grids (two identical x-z planes, separated by a distance y=1, giving one spanwise cell for all grid levels). You may use whichever is more convenient for your particular application.

Format for the structured 2D grids is PLOT3D-type, formatted, MG, 2D (nbl=1) - note that you must use double precision when reading! :

      read(2,*) nbl
      read(2,*) (idim(n),jdim(n),n=1,nbl)
      do n=1,nbl
        read(2,*) ((x(i,j,n),i=1,idim(n)),j=1,jdim(n)),
     +            ((y(i,j,n),i=1,idim(n)),j=1,jdim(n))
      enddo

Download the 2-D version of the grids in PLOT3D format here:

• (2-D) 161 x 513 (gzipped) (< 1 MB)
• (2-D) 81 x 257 (gzipped) (< 1 MB)
• (2-D) 41 x 129 (gzipped) (< 1 MB)
• (2-D) 21 x 65 (gzipped) (< 1 MB)
• (2-D) 11 x 33 (gzipped) (< 1 MB)

Format for the structured 3D grid is PLOT3D-type, formatted, MG, 3D (nbl=1, and idim in this case is 2) - note that you must use double precision when reading! :

      read(2,*) nbl
      read(2,*) (idim(n),jdim(n),kdim(n),n=1,nbl)
      do n=1,nbl
        read(2,*) (((x(i,j,k,n),i=1,idim(n)),j=1,jdim(n)),k=1,kdim(n)),
     +            (((y(i,j,k,n),i=1,idim(n)),j=1,jdim(n)),k=1,kdim(n)),
     +            (((z(i,j,k,n),i=1,idim(n)),j=1,jdim(n)),k=1,kdim(n))
      enddo

Download the 3-D version of the grids in PLOT3D format here:

• (3-D) 2 x 161 x 513 (gzipped) (< 1 MB)
• (3-D) 2 x 81 x 257 (gzipped) (< 1 MB)
• (3-D) 2 x 41 x 129 (gzipped) (< 1 MB)
• (3-D) 2 x 21 x 65 (gzipped) (< 1 MB)
• (3-D) 2 x 11 x 33 (gzipped) (< 1 MB)

If desired, example Neutral Map Files associated with 3-D version of the grids are given here (these files specify grid indices associated with each boundary condition - see The Neutral Map File):

• Neutral Map File for (3-D) 2 x 161 x 513
• Neutral Map File for (3-D) 2 x 81 x 257
• Neutral Map File for (3-D) 2 x 41 x 129
• Neutral Map File for (3-D) 2 x 21 x 65
• Neutral Map File for (3-D) 2 x 11 x 33

CGNS Files

The structured grids are also available as CGNS files (3-D versions only, with two identical x-z planes, separated by a distance y=1, giving one spanwise cell for all grid levels). Note that the BCs written inside the CGNS files are for guidance only, and may not reflect the appropriate BCs needed for your application. To read/write CGNS files, (free) software may be necessary if your pre/post-processing tools do not already handle it. See: CGNS Website for details.

Download the 3-D version of the grids in CGNS format (gzipped) here:

• (3-D) 2 x 161 x 513 (gzipped) (< 1 MB)
• (3-D) 2 x 81 x 257 (gzipped) (< 1 MB)
• (3-D) 2 x 41 x 129 (gzipped) (< 1 MB)
• (3-D) 2 x 21 x 65 (gzipped) (< 1 MB)
• (3-D) 2 x 11 x 33 (gzipped) (< 1 MB)

UNSTRUCTURED VERSIONS OF GRIDS

CGNS Files

The unstructured versions of the same grids are all given as CGNS files. Note that the BCs written inside the CGNS files are for guidance only, and may not reflect the appropriate BCs needed for your application. To read/write CGNS files, (free) software may be necessary if your pre/post-processing tools do not already handle it. See: CGNS Website for details.

The unstructured grids are all given as 3-D grids (two identical x-z planes, separated by a distance y=1, giving one spanwise cell for all grid levels). They are given as hexahedra (quadrilaterals in the x-z plane).

Download the unstructured CGNS grids (gzipped) as 3-D hexahedra (quadrilaterals in x-z plane) here:

• (3-D) unstructured quad version of 2 x 161 x 513 (1.9 MB)
• (3-D) unstructured quad version of 2 x 81 x 257 (< 1 MB)
• (3-D) unstructured quad version of 2 x 41 x 129 (< 1 MB)
• (3-D) unstructured quad version of 2 x 21 x 65 (< 1 MB)
• (3-D) unstructured quad version of 2 x 11 x 33 (< 1 MB)

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Responsible NASA Official: Ethan Vogel
Page Curator: Clark Pederson
Last Updated: 05/13/2019