This page requires JavaScript for proper operation of the menus.
NASA Glenn Research Center
Grid for a turbine stage CFD Codes for Turbomachinery, Dr. Rodrick V. Chima, NASA Glenn Research Center, Cleveland, Ohio, USA Pressure contours on a turbine stage
 CFD CODES HOME BUTTON
GRAPE: 2-D GRIDS BUTTON
RVCQ3D: Q-3-D ANALYSIS BUTTON
TCGRID: 3-D GRIDS BUTTON
 SWIFT: 3-D ANALYSIS BUTTON
REFERENCES BUTTON
AUTHOR BUTTON
TURBOMACHINERY BRANCH BUTTON
INLETS & NOZZLES BRANCH BUTTON

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.


Test cases included with TCGRID 400
Click on a preview image below to open a larger image in your browser.
Use your < Back > button to return to this screen.

Grid for a compressor rotor

NASA rotor 37


Grid for a turbine vane

Goldman annular turbine cascade

Grid for a compressor stage

NASA stage 35

Grid for 4 turbine blades

SSME 2-stage fuel turbine

Grid for a fan blade

NASA rotor 67

Grid for a centrifugal impeller

H-grid for the large low-speed centrifugal impeller

 

NASA logo + NASA - Home + NASA Privacy and Security Notices

Curator: John Slater
NASA Official: Mary Jo Long-Davis
Last Updated: 05/04/2012