Wind-US
Wind-US may be used to solve various sets of equations governing physical phenomena related to fluid flow. Currently, the code supports the solution of the Euler and Navier-Stokes equations of fluid mechanics using multi-zone structured, unstructured, or hybrid grids, along with additional equation sets governing turbulent and chemically reacting flows.
Detailed information about Wind-US is available at the Wind-US Documentation web site. In addition to the documentation for Wind-US itself, documentation is also available for various pre- and post-processing programs used with Wind-US. Most of the documentation is available in both PDF and HTML form.
The NPARC Alliance also maintains a CFD Code Validation web site. The objectives of the site are: (1) to provide documented validation and example cases, with downloadable input and output files, for Wind-US; and (2) to provide analytical, computational, and experimental validation data for use by the CFD community in general.
Wind-US is a product of the NPARC Alliance, a partnership between the NASA Glenn Research Center (GRC) and the USAF Arnold Engineering Development Center (AEDC)  dedicated to the establishment of a national, applications-oriented flow simulation capability. The Boeing Company has also been closely associated with the Alliance since its inception, and represents the interests of the NPARC User's Association.
Wind-US, and the associated pre- and post-processing tools, are releasable to all U. S. owned companies, public and private universities, and government agencies. However, only U. S. citizens and resident aliens may have access to the software. For more details, see the Obtaining Wind-US and the Tools section of the Wind-US Installation Guide, and the NPARC Software Release Instructions at the NPARC Alliance web site.
Geometric Modeling
- Multi-zone structured, unstructured, or hybrid grids. (Not all features of Wind-US are available for both structured and unstructured grids. See the Wind-US User's Guide for details.)
- Abutting zones with contiguous or non-contiguous grids, or overlapping (Chimera) zones including holes and single or double fringes.
- Stationary or rotating reference frame.
Physical Modeling
- Steady or unsteady, three-dimensional, two-dimensional, or axisymmetric flow.
- Compressible Navier-Stokes, thin-layer Navier-Stokes, parabolized Navier-Stokes, Euler equations.
- Wide variety of explicit and implicit boundary conditions for internal and external flows.
- Algebraic, one-equation, and two-equation turbulence models
- Perfect gas, frozen chemistry, equilibrium air, and finite-rate chemistry.
- Models for actuator disks, screens, vortex generators.
Solution Algorithms
- Block-implicit, scalar-implicit, or explicit solution operator; also Jacobi, Gauss-Seidel, MacCormack's modified approximate factorization, ARC3D 3-factor diagonal scheme.
- First or second order implicit time marching.
- Central differencing, and Coakley, Roe, Van Leer, Rusanov, and HLLE upwind differencing, first to fifth order.
- Explicit and implicit boundary conditions.
- Time step specified directly or through a CFL number.
- Runge-Kutta and Global Newton algorithms available.
- Convergence acceleration using grid sequencing, local CFL numbers, ramped CFL numbers.
Parallel Operation
- May be run in parallel on a multi-processor system, or on a cluster of heterogeneous systems, using a fault-tolerant master-worker approach.
- Grid zones are distributed from the master to the worker systems for processing.
- Wind-US and PVM need not be pre-installed on worker systems.
- PVM is used on clusters; PVM or MPI may be used on multi-processor systems. PVM software is included with Wind-US, MPI is not.
I/O
- User input data specified using "English-like" keywords.
- Grid and solution files may be in "common file" or CGNS format.
- Wind-US common files are supported by several commercial grid generation and flow visualization programs.
Examples
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