TCGRID

TCGRID v. 400

Overview

TCGRID (Turbomachinery C-GRID) is a 3-D grid generation code for turbomachinery blades. It can generate single or multiblock grids that are compatible with various analysis codes including SWIFT and ADPAC. Single-block grids can be either C-type or H-type, and can be for linear cascades or annular blade rows. Multi-block grids use C-type grids around the blade, and can add an H-grid in the inlet region and O-grids in the hub or tip clearance regions.

Applications

• Linear cascades
• Axial compressors and turbines
• Isolated blade rows or multistage machines
• Centrifugal impellers and mixed flow machines (no splitters)
• Radial diffusers
• Pumps

Grid Types

• C- or H-grids around blades
• C-grid with upstream H-grids
• O-grids in hub and tip clearance regions
• Multistage machines are modeled by merging C-grids for individual blades

Formulation

• Blade-to-blade grids are generated with a fast elliptic solver like GRAPE.
• Spanwise reclustering is done using cubic splines.
• H-grids in inlet regions and O-grids in clearance gaps are generated algebraically.

Input and output

• Namelist input
• Hub and casing geometries input in (z,r) coordinates
• Blade geometries input in general (z,r,th) coordinates, or MERIDL formats (z,r,th1,th2) or (z,r,th1-th2)
• New monotone splines follow slope discontinuities without overshoots

Printed Output

• Input parameters
• Convergence information for blade-to-blade grids
• Spanwise output of inlet, leading edge, trailing edge, and exit coordinates
• Index file with grid size information for SWIFT

Grid & Debug Output

• Grid files are written as binary data in standard PLOT3D format
• Intermediate grid files can be output for debug or other purposes. These files include reclustered blade coordinates, the 2-D throughflow grid, and 2-D blade-to-blade grids.

Computer and graphics requirements

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

GRAPE, RVCQ3D, TCGRID, and SWIFT

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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, butwill run on 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 web sites for information on CFD visualization software.

PLOT3D	https://software.nasa.gov/software/ARC-14400-1
TecPlot:	http://www.tecplot.com
FieldView:	http://www.ilight.com
EnSight CFD:	http://www.ensightcfd.com/

Test cases included with TCGRID 400