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Development of an Improved Unsteady Low Mach Number Navier-Stokes Simulation…

Award Information

Agency:
Department of Defense
Branch:
N/A
Award ID:
Program Year/Program:
2011 / SBIR
Agency Tracking Number:
A111-003-0042
Solicitation Year:
2011
Solicitation Topic Code:
A11-003
Solicitation Number:
2011.1
Small Business Information
Combustion Research and Flow Technology, Inc.
6210 Kellers Church Road Pipersville, PA -
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 2011
Title: Development of an Improved Unsteady Low Mach Number Navier-Stokes Simulation Module for Rotorcraft Aerodynamics
Agency: DOD
Contract: W911W6-11-C-0039
Award Amount: $99,971.00
 

Abstract:

Accurate and efficient modeling of rotorcraft flowfields is challenging due to a combination of unsteady flow dynamics and a large disparity in Mach numbers. Preconditioning techniques used to alleviate numerical stiffness from low Mach numbers in steady flows have not performed as well in unsteady environments since preconditioning parameters that are optimal for efficiency are detrimental to the level of spatial dissipation necessary for accuracy. A unified flux formulation is proposed here where the optimal scaling required for spatial accuracy is independent of the preconditioning required for time-accuracy thus providing a framework that is valid over a broad range of flow conditions. An additional objective of our effort is the formulation of a more comprehensive"unsteady"preconditioning methodology when multiple time scales are present that would account for both for the unsteady frequencies associated with local flow fluctuations, as well as system wide frequencies such as the blade passage frequency. In this effort, we will test and validate proposed unsteady flux formulations on unit problems with analytical solutions, while its application to rotorcraft flowfields and implementation in the Helios rotorcraft computational framework will be undertaken in the follow-on Phase II effort.

Principal Investigator:

Ashvin Hosangadi
Principal Scientist
(215) 766-1520
hosangad@craft-tech.com

Business Contact:

Brian J. York
Treasurer and Principal Scientist
(215) 766-1520
york@craft-tech.com
Small Business Information at Submission:

Combustion Research and Flow Technology, Inc.
6210 Kellers Church Road Pipersville, PA -

EIN/Tax ID: 232759059
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No