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Large Eddy Simulations of Hot Supersonic Jets for Aeroacoustics

Award Information

Department of Defense
Award ID:
Program Year/Program:
2009 / STTR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Cascade TechNologies, Inc.
2445 Faber Place Suite 100 Palo Alto, CA 94303-3347
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2009
Title: Large Eddy Simulations of Hot Supersonic Jets for Aeroacoustics
Agency / Branch: DOD / NAVY
Contract: N68335-09-C-0368
Award Amount: $70,000.00


The technical objective of this proposal is to develop and demonstrate LES capability to predict hot jet noise at supersonic operating conditions of tactical aircrafts. We also propose an LES based non-linear instability method (NPSE) to provide reduced order, physics-based models for noise generated by large-scale turbulent structures in hot jets. CASCADE's unstructured solver, CHARLES, will be used for LES noise prediction. To achieve this, fully compressible N-S equation with dynamic SGS model will be solved in the near field, this data is then used to calculate the far field noise using acoustics projection methods. Near-field LES results will also provide mean flow fields and amplitude of instability waves required for NPSE modeling. Careful validation of the flow field and noise predictions will be conducted in close partnership with an industry partner (UTRC). In phase I, the feasibility of proposed methods will be demonstrated using pressure-matched hot jets with round nozzles. In phase I option, we extend the complexity to chevron nozzles and pressure-mismatched operating conditions. In Phase II, we focus on realistic nozzle geometries and engine configurations. In addition, the effect of airframe will be integrated in noise calculations.

Principal Investigator:

Shoreh Hajiloo
General Manager

Business Contact:

Parviz Moin
Small Business Information at Submission:

Cascade Technologies Incorporated
1330 Charleston Road Mountain View, CA 94043

EIN/Tax ID: 043353686
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
California Institute of Technology
1200 East California Boulevard
Pasadena, CA 91125
Contact: Tim Colonius
Contact Phone: (626) 395-4021
RI Type: Nonprofit college or university