Langley Research Center Turbulence Modeling Resource

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TURBULENCE MODEL NUMERICAL ANALYSIS

Grids - 2D Finite Flat Plate

Note that the grids and definition of this case have been changed as of 10/02/2014.

The methodology to create a series of nested grids is provided. The coordinate system is defined with x streamwise, y spanwise, and z normal. Each grid is a PLOT3D unformatted file of size ni x nj x nk, where ni is the number of points in the spanwise direction (ni=2), nj is the number of points in the streamwise direction, and nk is the number of points in the vertical direction. Each coarser grid is exactly every-other-point of the next finer grid, ranging from 2 x 2561 x 769 (finest grid) to 2 x 21 x 7 (coarsest grid). The grids are built in nondimensional units, with the plate extending from x=0 to x=2 and the grid extending to x=-2 upstream and x=4 downstream. The grid is stretched in the wall-normal directions and is clustered in the leading and trailing edge regions, with aspect ratio near these areas of approximately 1. The figure below shows a view of the level 5 grid of size nj=161 x nk=49 in the streamwise x normal directions.

The figure below shows a view of the level 6 grid of size nj=81 x nk=25 in the streamwise x normal directions.

Note: be sure to use double precision when reading (or writing) the grids!

STRUCTURED VERSIONS OF GRIDS

PLOT3D Files

A simple FORTRAN program (updated on 10/02/2014) is provided that can be used to generate the grids in PLOT3D format. All information has been hardwired into the program except a single integer (between 1 and 8) indicating the level of the grid to be generated (finest to coarsest). For example, the cell aspect ratio near the leading and trailing edges is hardwired via parameter aspect_ratio_edge to be approximately 1.

Neutral Map Files associated with each grid are also generated by the above program (these files specify grid indices associated with each boundary condition - see The Neutral Map File). The following is an example neutral map file:

• Neutral Map File for (3-D) 2 x 21 x 7

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Last Updated: 11/10/2021