CFD Utilities Files

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!
   program extract_grid_line
!
!  Description:
!
!     This was prompted by the need to plot stagnation line data from an entry
!     capsule flow solution on a structured grid at angle of attack.  Strangely,
!     DPLR's Postflow utility produces a line of cells (2 x 2 x nk), not a line
!     of points (1 x 1 x nk) when a line is specified.  For now, a single k line
!     per run is output.  Generalization can wait for a need.
!
!  Input:
!
!     Prompts are issued for Plot3D grid and function files, and for the indices
!     of one surface point (ib,i,j,k), with k = 1 assumed to be at the surface.
!     Function names are also prompted for, with "x", "y", "z" assumed for the
!     coordinates.
!
!  Output:
!
!     All functions are output with (x,y,z) as a structured Tecplot dataset, and
!     arc lengths from k = 1 to nk are inserted as an extra function.  POINT
!     order is chosen so that columns of data may be manipulated as needed.
!
!  History:
!
!     09/12/2025  D.A.Saunders  Initial design.
!     09/14/2025    "     "     Initial implementation.
!     09/15/2025    "     "     Initial testing.
!
!  Author:  David Saunders, AMA, Inc. at NASA Ames Research Center, CA
!
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