PEGASUS 5 is a code which performs a pre-processing step for the
Overset CFD method. The code prepares the overset volume grids for
the flow solver by computing the domain connectivity database, and
blanking out grid points which are contained inside a solid body.
PEGASUS 5 is the latest version of the PEGASUS series of mesh
interpolation codes. The main purpose for the development of this
latest version was to significantly decrease the number of user inputs
required and to allow for easier operation of the code. The result is
a process which is automatic for many flow analysis problems. All
that is required from the user for most cases is an OVERFLOW
input file and the volume grids. Some cases will require some
additional input from the user.
Links to PEGASUS 5 Web resources
Features of the PEGASUS 5 code
- Automatic minimum hole cutting: this only requires that the
solid-wall boundary conditions form an enclosed surface.
- Hole optimization is achieved by effectively growing the minimum
holes such that the interpolation boundary interfaces are optimized at
a local cell-by-cell level.
- Outer boundaries are automatically detected, and interpolation
boundary conditions are computed.
- Memory is dynamically allocated at run time. The code is written
entirely in Fortran 90, and thus requires a Fortran 90 compiler.
- Restarting is similar to the UNIX "make" facility. As new meshes or
inputs are added, PEGASUS will recognize these new changes and performs
only the required operations.
- An internal projection process removes gaps found at randomly
overset surface meshes, providing accurate interpolation in the
- Parallel option: the code can be compiled to use the Message
Passing Interface (MPI) standard so that it can run simultaneously on
distributed memory computers, enabling the processing of large cases
in a matter of minutes.
Generic Business Jet
Ball inside a duct
- Red grid lines: hole in sphere grid cut by
- Green grid lines: hole in duct grid cut by
Top view looking down on grid plane in the center-plane of the sphere
- Green symbols: sphere-grid points receiving data from duct
- Magenta symbols: duct-grid points receiving data from sphere