Engineering Formulations for Turbulence Modeling of Variable Surface Roughness Effects in Wall-Bounded Flows

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$149,830.00
Award Year:
2012
Program:
SBIR
Phase:
Phase I
Contract:
W911W6-13-C-0001
Agency Tracking Number:
A122-075-0042
Solicitation Year:
2012
Solicitation Topic Code:
A12-075
Solicitation Number:
2012.2
Small Business Information
MetroLaser, Inc.
8 Chrysler, Irvine, CA, -
Hubzone Owned:
N
Socially and Economically Disadvantaged:
Y
Woman Owned:
N
Duns:
188465819
Principal Investigator:
Jacob George
Senior Scientist
(949) 553-0688
jageorge@metrolaserinc.com
Business Contact:
Cecil Hess
President
(949) 553-0688
cecilh@metrolaserinc.com
Research Institution:
Stub




Abstract
The proposed effort has the objective to develop a method for representing the influence of surface roughness on turbulent transport. The method is designed for highly non-equilibrium flows, as occurs on helicopter rotors, and in other engineering applications. It is based on the displacement of origin approach, which is a way to incorporate roughness into Reynolds-averaged Navier-Stokes (RANS) turbulence models via modified boundary conditions: it is our objective to devise an approach that is useable with standard engineering meshes and CFD methods. Further, the methodology also contains a formulation for intermittency, suitable for rough-wall boundary layers, to blend between laminar and fully turbulent states. The model will be validated against experimental data for abruptly changing surface roughness. Additional experiments will be conducted under this SBIR Phase I program to address the type of roughness that is found on rotors operated in harsh environments, and with protective coatings. While the acquired data is directly relevant to this application, it will also be of fundamental, benchmark type.

* information listed above is at the time of submission.

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