| PROPOSAL NUMBER: | 02- A7.01-9262 (For NASA Use Only - Chron: 022737 ) |
| SUBTOPIC TITLE: | Modeling and Control of Complex Flows Over Aerospace Vehicles and Propulsion Systems |
| PROPOSAL TITLE: | Comprehensive Uncertainty Estimation for CFD |
SMALL BUSINESS CONCERN
(Firm Name, Mail Address, City/State/Zip, Phone)
Nielsen Engineering & Research, Inc.
526 Clyde Ave
Mountain View , CA 94043 - 2212
(650 ) 968 - 9457
PRINCIPAL INVESTIGATOR/PROJECT MANAGER
(Name, E-mail, Mail Address, City/State/Zip, Phone)
Robert E. Childs
childs@nearinc.com
526 Clyde Ave
Mountain View , CA 94043 - 2212
(650 ) 968 - 9457
TECHNICAL ABSTRACT (LIMIT 200 WORDS)
Computational fluid dynamics (CFD) is the primary tool of
aerodynamic design, and the ability to reduce and quantify
uncertainties in CFD results is essential. Efforts throughout the
CFD community are aimed at improving the accuracy of CFD methods.
The proposed work will develop computational algorithms and software
that yield comprehensive estimates of uncertainty in CFD results.
The methods involve error modeling, in which specific sources of
error, such as truncation error, and error in the transition and
turbulence modeling, are related to the errors and uncertainty
in the solution via solutions of an error equation. These methods
will be relatively comprehensive, accounting for the dominant sources
of uncertainty in typical CFD analyses, and yielding the
uncertainties in all data predicted by the CFD solution. For example, the uncertainty in distributed aerodynamic heating can be computed.
The techniques to be used in the work have been demonstrated in predictions of uncertainty due to truncation error in structured-grid
CFD data. The proposed work will extend these methods to
unstructured-grid CFD and to transition and turbulence modeling
errors.
POTENTIAL COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
The proposed technology will have commercial benefit wherever CFD is
used to assess aerodynamic performance in critical applications.
This includes the design and analysis of all commercial, NASA, and
military aerospace vehicles. The technology developed will be
represented as a set of software modules that can be used with existing and new CFD solvers.
POTENTIAL NASA APPLICATIONS (LIMIT 150 WORDS)
The proposed technology will yield an improved ability to design
and optimize aerospace vehicles, including conventional flight
vehicles and launch vehicles. This will benefit NASA s core
missions.