Improved Turbulence Modelling Across Disparate Length Scales for Naval Computational Fluid Dynamics Applications

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-15-C-0246
Agency Tracking Number: N15A-002-0045
Amount: $84,779.00
Phase: Phase I
Program: STTR
Awards Year: 2015
Solicitation Year: 2015
Solicitation Topic Code: N15A-T002
Solicitation Number: 2015.1
Small Business Information
8000 Madison Blvd., Suite D102-351, Madison, AL, 35758-2035
DUNS: 363342069
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Edward Kansa
 (256) 270-0956
 ek@comscis.com
Business Contact
 Tatiana Shvetsova
Title: Technical Point of Contact
Phone: (256) 270-0956
Email: tatiana.shvetsova.comscis@gmail.com
Research Institution
 Rensselaer Polytechnic Institute
 Susan Pepe
 110 8th Street,
West Hall 4th Floor
Troy, NY, 12180
 (518) 276-2087
 Domestic nonprofit research organization
Abstract
Computational Sciences LLC will collaborate with the Rensselaer Polytechnic Institute (RPI) to develop and validate a stand-alone computational module that naturally accounts for the effects of turbulence. Such fluctuations and transitions may be associated with compressible flows and boundary layer interactions. The module will be designed for implementation in to existing legacy codes for use in characterization of unsteady vorticity-dominated flows.

The approach is based on a novel, regularized set of Navier-Stokes equations (RNS) that is extended to account for turbulence effects (fluctuations) in the continuum approximation. RNS has several important features not found in classical NS equations that are of direct relevance turbulent flows: (a) Kolmogorov-scale field fluctuations resulting from a mathematical model that accounts for turbulent diffusion in a natural manner that allows direct simulation of phenomena such as laminar-turbulence transition and wall slip effects; and (b) Natural accounting of growth of small-scale turbulent structures without refining down to Kolmogorovs scale.

Phase I will focus on a simplified 3D working version of the approach by removing the selected restrictions. The validation of the model will be provided by comparison of the simulation results with the experimental data for a set of representative turbulent flows. The software module will be connected to a high order compressible flow code and will be exercised and evaluated against experimental data for selected model problems that contain elements of both nearfield and farfield wakes. Phase II will refine the approach to include generalized vortical flows generated by 6 degree-of-freedom hard body interactions, and will validate it on problems of interest to the Navy.

* Information listed above is at the time of submission. *

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