Swift v. 300
Overview
Swift is a multiblock CFD code for the analysis of 3-D flows
in turbomachinery, developed by Dr. Rodrick V. Chima at NASA
Glenn Research Center. The code solves the thin-layer Navier-Stokes
equations using explicit finite-difference techniques. It
can be used to analyze linear cascades or annular blade rows
with or without rotation. Limited multiblock capability can
be used to model tip-clearances and multistage machines.
TCGRID is a separate grid generator used to generate computational
grids for Swift. Grids are stored in PLOT3D format and can
be used with other analysis codes.
Swift home page: http://www.grc.nasa.gov/WWW/5810/rvc/
Swift and TCGRID are available to companies and universities
within the United States from the NASA GRC software repository:
https://technology.grc.nasa.gov/software/
Applications
- Linear cascades and rectangular ducts
- Axial compressors and turbines
- Isolated blade rows or multistage machines
- Centrifugal impellers, mixed flow machines without splitters,
radial diffusers, and pumps
Multi-block capability
- C-grids around blades with H-grids upstream
- H-grids around blades
- O-grids for hub and tip clearances (a non-gridded clearance
model is also available)
- Patched C-grids for multistage calculations using an
averaging-plane technique
Formulation and differencing schemes
Swift solves the Navier-Stokes equations formulated in a
Cartesian coordinate system with rotation about the x-axis.
The equations are mapped to a general body-fitted coordinate
system. Streamwise viscous terms are neglected using the
thin-layer assumption, but all cross-channel viscous terms
are retained.
- Central difference with artificial viscosity
- AUSM+ and H-CUSP upwind schemes
Turbulence models
- Baldwin-Lomax or Cebeci-Smith algebraic models
- Wilcox's k-omega or Menter SST two-equation models
All turbulence models include transition and roughness effects.
Numerical method
- Explicit multi-stage Runge-Kutta scheme
- Variable time-step and implicit residual smoothing for
convergence acceleration
- Preconditioning for low-speed (incompressible) flows
Input and output
- Grids are usually generated using TCGRID and are stored
in PLOT3D format
- Namelist input
- Solution files are in PLOT3D format
- Printed output of convergence history, spanwise output
of average flow properties, and streamwise output of blade
surface properties
Computer and graphics requirements
Swift requires a Fortran 90 compiler and CFD visualization
software for use.
Examples
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