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GRAPE v. 107


The GRAPE code (GRids about Airfoils using Poisson’s Equation) is an elliptic grid generator originally intended for isolated airfoils. The code was written by Reece Sorenson at NASA Ames Research Center, and was modified by Rod Chima at NASA Glenn to allow generation of periodic C-type grids for turbomachinery blades. Turbomachinery grids generated with GRAPE can be used directly with the RVCQ3D CFD code.


Grid Types

The geometry input to GRAPE is completely general. If you can generate coordinates for your geometry, GRAPE can probably put put a grid around it.


Input and output

Computer and graphics requirements

GRAPE requires a Fortran 90 compiler and CFD visualization software for use. Click the button below for more information.

Computers & Graphics Button – Link to popup –


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Computer requirements

All codes are supplied as Fortran source code and require a Fortran 90 compiler for use. The Cray, Compaq, GNU, Intel, and SGI compilers have all been used successfully. The codes are usually run on Linux systems, but will run on a PC or Mac. Parallel processing is available on multi-core computers using OpenMP directives. Check the Fortran Store for information on Fortran compilers.

Graphical output

No graphical output is provided with these codes, but access to some CFD visualization software is required to view and evaluate the grids and solutions. Grid and solution files are in standard PLOT3D format and can be read directly and plotted with the public-domain CFD visualization tool PLOT3D, or the commercial tools FieldView, TecPlot, or EnSight CFD. Check the following websites for information on CFD visualization software.

EnSight CFD:

Test cases included with GRAPE 107

NASA rotor graphic
C-grid, NASA rotor 37, 70 percent span
Centrifugal impeller graphic
C-grid, NASA 6:1 centrifugal impeller
Goldman annular turbine vane graphic
C-grid, Goldman annular turbine vane
Garabedian and Korn airfoil graphic
O-grid, Garabedian and Korn airfoil
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