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Grids - Axisymmetric Separated Boundary Layer Case

A series of 5 nested grids, in units of m, 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 1425 x 385 to the coarsest 90 x 25 grid. The following figure shows a portion of the 357 x 97 grid (2 levels down from the finest grid). The grid is not drawn to scale (the vertical direction has been expanded for clarity), and the full extent of the grid in the horizontal direction is not shown. Note that the solid wall begins at x = -1.1m, at index 33 on the finest grid. Also note that for the Driver data, the wall-normal coordinate y' is defined such that y'=0 on the cylinder surface. However, in the CFD grid, y=0 represents the cylinder's axis of rotation, and the cylinder surface is at y=0.07 m). The simple transformation is given by: y' = y - 0.07.

portion of Driver 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 axisymmetric grids (two planes rotated through 1 deg from each other; one plane rotated +0.5 deg from the x-z plane, and the other plane rotated -0.5 deg from the x-z plane). You may use whichever is more convenient for your particular application. If you get the 2-D grid version, then you must create an axisymmetric grid from it on your own.

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:

Format for the 2-rotated-plane 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:

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):


 

UNSTRUCTURED VERSIONS OF GRIDS

AFLR3 Files

The unstructured versions of the same 3-D grids are all given as AFLR3 (UGRID) files. Note that the BCs given for these files are for guidance only, and may not reflect the appropriate BCs needed for your application.

Download the unstructured AFLR3 grids (gzipped) here:

All AFLR3 grids have the same mapbc file: driver-all-1zn-narrow.mapbc.
 
 

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Responsible NASA Official: Ethan Vogel
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Last Updated: 03/11/2025