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Grids - 2D Bump-in-channel Verification Case

A series of 5 nested 2-D grids are provided. Each coarser grid is exactly every-other-point of the next finer grid, ranging from the finest 1409 x 641 to the coarsest 89 x 41 grid. The finest grid has minimum spacing at the wall of y=5 x 10^-7, giving an approximate average y+=0.06 over the plate at the Reynolds number run. Even the coarsest grid has reasonably fine wall-normal spacing, giving an approximate average y+=0.95 over the plate. The grid is stretched in the wall-normal direction, and is also clustered near the plate leading and trailing edges. The bump plate itself extends from x=0 to x=1.5, with symmetry extending both upstream and downstream of the body. The upstream boundary is at x=-25, the downstream boundary is at x=26.5, and the top boundary is at height 5.0. The following figure shows a portion of the 177 x 81 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=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) 1409 x 641 (641 points on solid plate) (gzipped) (10 MB)
• (2-D) 705 x 321 (321 points on solid plate) (gzipped) (2 MB)
• (2-D) 353 x 161 (161 points on solid plate) (gzipped) (< 1 MB)
• (2-D) 177 x 81 (81 points on solid plate) (< 1 MB)
• (2-D) 89 x 41 (41 points on solid plate) (< 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 1409 x 641 (2 x 641 points on solid plate) (gzipped) (15 MB)
• (3-D) 2 x 705 x 321 (2 x 321 points on solid plate) (gzipped) (3 MB)
• (3-D) 2 x 353 x 161 (2 x 161 points on solid plate) (gzipped) (< 1 MB)
• (3-D) 2 x 177 x 81 (2 x 81 points on solid plate) (gzipped) (< 1 MB)
• (3-D) 2 x 89 x 41 (2 x 41 points on solid plate) (< 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 1409 x 641
• Neutral Map File for (3-D) 2 x 705 x 321
• Neutral Map File for (3-D) 2 x 353 x 161
• Neutral Map File for (3-D) 2 x 177 x 81
• Neutral Map File for (3-D) 2 x 89 x 41

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 1409 x 641 (2 x 641 points on solid plate) (6 MB)
• (3-D) 2 x 705 x 321 (2 x 321 points on solid plate) (2 MB)
• (3-D) 2 x 353 x 161 (2 x 161 points on solid plate) (< 1 MB)
• (3-D) 2 x 177 x 81 (2 x 81 points on solid plate) (< 1 MB)
• (3-D) 2 x 89 x 41 (2 x 41 points on solid plate) (< 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 associated with these 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 two different ways: as hexahedra (quadrilaterals in the x-z plane), or cut into prisms (triangles 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 1409 x 641 (2 x 641 points on solid plate) (35 MB)
• (3-D) unstructured quad version of 2 x 705 x 321 (2 x 321 points on solid plate) (9 MB)
• (3-D) unstructured quad version of 2 x 353 x 161 (2 x 161 points on solid plate) (2 MB)
• (3-D) unstructured quad version of 2 x 177 x 81 (2 x 81 points on solid plate) (< 1 MB)
• (3-D) unstructured quad version of 2 x 89 x 41 (2 x 41 points on solid plate) (< 1 MB)

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

• (3-D) unstructured quad version of 2 x 1409 x 641 (2 x 641 points on solid plate) (39 MB)
• (3-D) unstructured quad version of 2 x 705 x 321 (2 x 321 points on solid plate) (10 MB)
• (3-D) unstructured quad version of 2 x 353 x 161 (2 x 161 points on solid plate) (2 MB)
• (3-D) unstructured quad version of 2 x 177 x 81 (2 x 81 points on solid plate) (< 1 MB)
• (3-D) unstructured quad version of 2 x 89 x 41 (2 x 41 points on solid plate) (< 1 MB)

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

• (3-D) unstructured tri version of 2 x 1409 x 641 (2 x 641 points on solid plate) (33 MB)
• (3-D) unstructured tri version of 2 x 705 x 321 (2 x 321 points on solid plate) (8 MB)
• (3-D) unstructured tri version of 2 x 353 x 161 (2 x 161 points on solid plate) (2 MB)
• (3-D) unstructured tri version of 2 x 177 x 81 (2 x 81 points on solid plate) (< 1 MB)
• (3-D) unstructured tri version of 2 x 89 x 41 (2 x 41 points on solid plate) (< 1 MB)

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

• (3-D) unstructured tri version of 2 x 1409 x 641 (2 x 641 points on solid plate) (45 MB)
• (3-D) unstructured tri version of 2 x 705 x 321 (2 x 321 points on solid plate) (10 MB)
• (3-D) unstructured tri version of 2 x 353 x 161 (2 x 161 points on solid plate) (3 MB)
• (3-D) unstructured tri version of 2 x 177 x 81 (2 x 81 points on solid plate) (< 1 MB)
• (3-D) unstructured tri version of 2 x 89 x 41 (2 x 41 points on solid plate) (< 1 MB)

The following figure shows the 177 x 81 grid cut into triangles (prisms in 3-D):

 
 

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Recent significant updates:
09/23/2023 - added AFLR3 (UGRID) versions of unstructured grids

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Responsible NASA Official: Ethan Vogel
Page Curator: Clark Pederson
Last Updated: 09/23/2023