The CFD-FASTRAN package is a complete modelling and analysis system in that it provides tools for model construction, model setup, analysis and results extraction. The package consists of a grid generation environment(CFD-GEOM), a model setup interface (CFD-FASTRAN-GUI), a flow solver (CFD-FASTRAN-SOLVER) and a results extraction package (CFD-VIEW). The solver uses a finite volume density-based method based on either a Roe’s Flux Difference Splitting (FDS) scheme or a Van Leer’s Flux Vector Splitting (FVS) scheme for calculating the flux of mass, momentum and energy between cells. An entropy correction is built into the FDS solver to help suppress artificial waves around regions of sonic flow.It possess distinguished capabilities like
Overset Chimera Methodology Moving Body Capability (Both 6DOF and Prescribed Motion models) Supports Open Source Python Scripting Flow is solved with Cell Centered Finite Volume Approach, linearize Implicit Fluxes, and Finite Rate Chemistry.
The solver marches in time from an initial condition using either explicit or implicit time integration techniques. The timesteps can be constant across all cells for transient time accurate simulation or vary with each cell for steady flow simulations. Models of flow can be planar, axisymmetric or three dimensional using either a structured multi-block grid or unstructured polyhedral grid2. The software has the capability to model ideal, thermally perfect or chemically reacting mixtures of gases. Chemically reacting gases can be treated as being in equilibrium or in nonequilibrium using a modified Arrhenius model for the chemical reaction rate. Flows in vibrational nonequilibrium can be modelled with a two-temperature approach assuming a Landau-Teller rate model for the transfer of vibrational energy. These models are presented in Appendix A. By default the package solves the Navier Stokes equations of flow but the user can solve the reduced Euler set of equations by selecting the inviscid option. For turbulent flows, the software supports a range of RANS schemes such as k-epsilon, k-omega, Baldwin-Lomax, Spalart-Allmaras and the Menter Shear Stress Transport (SST) model.
--Aerodeepak 02:39, 14 August 2006 (MDT)