Hybrid NEWPAN grid generation on f16 CAD model
Structured panelling of a front wing and end plate assembly
Automatic wake generation in GEMS for a rear wing assembly
GEMS has been developed as a versatile geometry pre-processor for
engineering analysis, principally for Computational Fluid Dynamics
(CFD) codes. Its key feature is the way in which it integrates with
Computer-Aided Design (CAD) systems by providing native support for
all CAD geometry. GEMS provides pre-processing to a range of CFD
codes, from vortex-lattice to multiblock Navier-Stokes, and to
numerical analysis methods in other fields such as electromagnetics.
Its "plugin" architecture enables core functionality to be
supplemented by application-specific support. For example the NEWPAN
and SAUNA Plugins provide custom interfaces respectively to Flow
Solutions' panel method and QinetiQ's multiblock system.
GEMS provides an easy-to-use, powerful method for rapidly converting
geometrical models produced within a CAD system (input typically as
surfaces via IGES or STEP, or as point sets) to surface grids for
CFD. This stage has in the past proved to be the major bottleneck in
the analysis cycle, estimated by NASA to account for 70% to 80% of the
overall solution time. GEMS is designed to address this by providing
functionality such as CAD surface repair, CAD surface construction and
modification, and structured and unstructured surface grid generation.
These tools are presented in a way that is designed to be accessible
to the application engineer who may not necessarily have prior CAD
Key Functionality provided by GEMS
- A 3D environment for displaying, creating and manipulating geometry;
- Import from CAD via reliable and flexible IGES and STEP readers.
These include powerful consistency checks and "fix and continue"
repair and filtering options.
- Native support for all geometric and topological CAD entities,
including complex trimmed surface topologies (faces, shells, wires,
etc.) built on both NURBS and analytic geometry;
- Geometric construction, modification and repair; tools to cope with
imperfect geometric models containing gaps and overlaps. Should it
prove necessary to add or modify geometry, you won't be obliged to
return to the originating CAD system;
- Structured and unstructured surface grid generation and editing;
- Application specific model generation and export; integrated access
to solver execution and post-processing via the RUNWAY launch tool