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Grids - 2D Coflowing Jet Verification Case

A series of 5 nested 2-D grids are provided. As structured grids, these are comprised of 3 zones, connected in a one-to-one fashion. Each coarser grid is exactly every-other-point of the next finer grid, ranging from the finest 129 x 257, 129 x 257, 513 x 513 to the coarsest 9 x 17, 9 x 17, 33 x 33 grid. The finest grid has minimum spacing at the wall of y=0.000235, while the coarsest has y=0.005072. The grid is stretched in the wall-normal direction. In the wake region, the normal-direction clustering relaxes and the streamwise grid spacing gradually increases downstream.

Note that this case was previously referred to as a 2D Planar Shear, but it is more appropriately referred to as a 2D Coflowing Jet. Some of the figures associated with this case may still have the word "shear" in them.

The following figure shows a portion of the 33 x 65, 33 x 65, 129 x 129 grid (2 levels down from the finest grid):
portion of 2D coflowing jet 33x65, 33x65, 129x129 grid

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=3) - 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) 129x257, 129x257, 513x513 (gzipped) (3 MB)
(2-D) 65x129, 65x129, 257x257 (gzipped) (< 1 MB)
(2-D) 33x65, 33x65, 129x129 (gzipped) (< 1 MB)
(2-D) 17x33, 17x33, 65x65 (< 1 MB)
(2-D) 9x17, 9x17, 33x33 (< 1 MB)

Format for the structured 3D grid is PLOT3D-type, formatted, MG, 3D (nbl=3, 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) 2x129x257, 2x129x257, 2x513x513 (gzipped) (5 MB)
(3-D) 2x65x129, 2x65x129, 2x257x257 (gzipped) (1 MB)
(3-D) 2x33x65, 2x33x65, 2x129x129 (gzipped) (< 1 MB)
(3-D) 2x17x33, 2x17x33, 2x65x65 (gzipped) (< 1 MB)
(3-D) 2x9x17, 2x9x17, 2x33x33 (< 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):

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) 2x129x257, 2x129x257, 2x513x513 (6 MB)
(3-D) 2x65x129, 2x65x129, 2x257x257 (< 1 MB)
(3-D) 2x33x65, 2x33x65, 2x129x129 (< 1 MB)
(3-D) 2x17x33, 2x17x33, 2x65x65 (< 1 MB)
(3-D) 2x9x17, 2x9x17, 2x33x33 (< 1 MB)

UNSTRUCTURED VERSIONS OF GRIDS

CGNS and AFLR3 Files

The unstructured versions of the same grids are all given as CGNS and AFLR3 (UGRID) 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 here only as hexahedra (quadrilaterals in the x-z plane).

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

Download the unstructured AFLR3 grids (gzipped) as 3-D hexahedra (quadrilaterals in x-z plane) here:

All AFLR3 grids have the same mapbc file: shear_quad_all.mapbc.

Return to: 2D Coflowing Jet Verification Case Intro Page

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Recent significant updates:
10/02/2023 - added AFLR3 (UGRID) versions of unstructured grids

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Last Updated: 10/02/2023