SWIFT
v. 400
Overview
SWIFT is a multiblock CFD code for the analysis of 3D flows in
turbomachinery. The code solves the thinlayer NavierStokes equations
using explicit finitedifference 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 tipclearances and multistage
machines.
Applications
 Linear cascades
 Axial compressors and turbines
 Isolated blade rows or multistage machines
 Centrifugal impellers and mixed flow machines without splitters
 Radial diffusers
 Pumps
 Rectangular ducts
Multiblock capability
 Cgrids around blades with Hgrids upstream
 Hgrids around blades
 Ogrids for hub and tip clearances (a nongridded clearance model
is also available)
 Mixing planes for multistage calculations
 Version 400 now allows discontinuous spanwise grids at mixing planes
Formulation and differencing schemes SWIFT
solves the NavierStokes equations formulated in a Cartesian coordinate
system with rotation about the xaxis. The equations are mapped to a general
bodyfitted coordinate system. Streamwise viscous terms are neglected
using the thinlayer assumption, but all crosschannel viscous terms are
retained.
 Central difference + artificial viscosity
 Central difference + HCUSP upwind
 AUSM+ upwind scheme
Turbulence models
 BaldwinLomax (algebraic)
 CebeciSmith (algebraic)
 Wilcox's 2006 komega (twoequation) with stress limiter and crossdiffusion
 All turbulence models include transition and roughness effects.
Numerical method
 Explicit multistage RungeKutta scheme
 Variable timestep and implicit residual smoothing for convergence
acceleration
 Preconditioning for lowspeed (incompressible) flows
Input and output
 Namelist input
 Grids are usually generated using TCGRID and are stored in PLOT3D
format
 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. Click the button below for more information.
Test cases included with SWIFT 400
An Excel file with flow conditions, experimental data, and comparisons between computations and experiment is included with SWIFT 400 for each case.
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NASA rotor 37 
Goldman annular turbine cascade 
NASA stage 35 
SSME 2stage fuel turbine 
NASA rotor 67 
Large lowspeed centrifugal impeller 
