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Large Eddy Simulations of Buoyant Plumes.

Large Eddy Simulations of Buoyant Plumes.
(348 K)

Mell, W. E.; Johnson, A.; McGrattan, K. B.; Baum, H. R.

Combustion Institute/Eastern States Section. Chemical
and Physical Processes in Combustion. Proceedings.
Fall Technical Meeting, 1995. October 16-18, 1995,
Worcester, MA, 187-190 pp, 1995.

### Keywords:

combustion; buoyant plumes; simulation; equations;
combustion models

### Abstract:

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An approach to the study of gas phase combustion and
convection processes in fires using a combination of
mathematical analysis and computer simulation is
presented. It seeks to solve the governing equations
directly (if approximately) by decomposing the fire into
a large scale convective and radiative transport problem
coupled to a small scale model of combustion and
radiative emission. The combustion model assumes that
all of the thermodynamic properties of the fluid are
tied to the local mixture fraction, which is convected
by the large scale motion, which in turn is driven by
the heat released by the combustion processes. The
large scale flow is studied using finite difference
techniques to solve large eddy simulations of the
Navier-Stokes equations. As a first test of the
numerical approach, a buoyant helium plume is simulated
and results compared to a companion laboratory
experiment.
*