A New Two-Scale Decomposition Approach for Large-Eddy Simulation of Turbulent Flows

A novel computational approach, Two Level Simulation (TLS), was developed based on the explicit reconstruction of the small-scale velocity by solving the small-scale governing equations on the domain with reduced dimension representing a collection of one-dimensional lines embedded in the three-dimensional flow domain. A coupled system of equations, that is not based on an eddy-viscosity hypothesis, was derived based on the decomposition of flow variables into the large-scale and the small-scale components without introducing the concept of filtering. Simplified treatment of the small-scale equations was proposed based on modeling of the small-scale advective derivatives and the small-scale dissipative terms in the directions orthogonal to the lines. TLS approach was tested to simulate benchmark cases of turbulent flows, including forced isotropic turbulence, mixing layers and well-developed channel flow, and demonstrated good capabilities to capture turbulent flow features using relatively coarse grids.

Department dc:contributor.department

Aerospace Engineering

Grantor dc:publisher

Georgia Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Kemenov, Konstantin A.

Advisor dc:contributor.advisor

• Menon, Suresh

Committee members dc:contributor.committeemember

• Bunimovich, Leonid
• Cvitanovic', Predrag
• Sankar, Lakshmi N.
• Yeung, P. K.

• Turbulent flows
• Large eddy simulations
• Subgrid-scale modeling

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/1853/11520

OAI identifier oai:identifier

oai:repository.gatech.edu:1853/11520