NASA SBIR 2005 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER:05 A2.04-8523
SUBTOPIC TITLE:Aircraft Systems Noise Prediction and Reduction
PROPOSAL TITLE:Computational Aeroacoustics using the Generalized Lattice Boltzmann Equation

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
MetaHeuristics
209 W. Alamar Ave, Suite A
Santa Barbara ,CA 93105 - 3701
(805) 682 - 5766

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Kannan N. Premnath
nandha@metah.com
209 W. Alamar Ave, suite A
Santa Barbara, CA  93105 -3701
(805) 682 - 5766

TECHNICAL ABSTRACT (LIMIT 200 WORDS)
The overall objective of the proposed project is to develop a generalized lattice Boltzmann (GLB) approach as a potential computational aeroacoustics (CAA) tool for noise prediction thus contributing to NASA's goal of reducing noise levels of subsonic aircraft. Lattice Boltzmann equation (LBE) based simulations are attractive for CAA as they can handle very complex geometries and parallelize with excellent scalability. This enables efficient simulation of very large problems, such as airframe systems. The innovativeness of the proposed GLB method lies in employing multiple relaxation times to capture different hydrodynamic/acoustic modes accurately, in contrast to usual LBE solution methods using a single relaxation time for all modes. The GLB approach would enable higher fidelity CAA simulations as well as exhibit stability at higher Reynolds numbers. Multiple relaxation times can also enable represent turbulence better for large eddy simulation. In phase I, the feasibility of the GLB method will be evaluated by coding a 3D solver, including a subgrid scale turbulence model and multiblock grid refinement algorithms, with testing against several CAA benchmark problems. If successful, a validated package based on the GLB method interfaced to NASA pre/post processors, like CART3D, for complex geometries would be developed in Phase II.

POTENTIAL NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
The proposed GLB approach for computational aeroacoustics will have a broad range of applications, particularly for structures with complex geometrical shapes. These include noise prediction from a variety of airframe structures such as landing gear, flaps and slats during take-off and landing. The approach is also well suited for acoustic analysis of aircraft internal systems. In addition to prediction of noise, the computational package would also be applicable to computational fluid dynamics of low Mach number flows in aircraft systems.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
Potential non-NASA commercial applications of the GLB computational package include prediction of noise from a variety of automotive components and industrial equipment such as HVAC systems. There is a significant opportunity in these sectors as the existing commercial computational packages for fluid dynamics, which are based on decades old algorithms, are not able to address such large-scale coupled acoustics/fluid dynamics problems adequately.

NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.

TECHNOLOGY TAXONOMY MAPPING
Airframe
Airport Infrastructure and Safety
Simulation Modeling Environment
Structural Modeling and Tools


Form Printed on 09-19-05 13:12