Turbulence Combustion Closure Model Based On
The Eddy Dissipation Concept For
Large Eddy Simulation
Author(s)
B. Panjwani, I. S. Ertesvåg, A. Gruber & K. E. Rian
Abstract
Modeling of turbulence-chemistry interaction is still a challenge. Turbulence
modeling with Large Eddy Simulation (LES) has been matured enough for
industrial problems. In LES eddies up to the filter width are resolved on the
grid scales, but the fine structures where combustion takes place are still not
resolved, which calls for combustion modeling in LES. Combustion closure in
LES is achieved through a Turbulence Chemistry InteractionModel (TCIM). Most
of the developed TCIM are based on the already existing RANS model. In the
present study, a TCIM based on the Eddy Dissipation Concept (EDC) is proposed
for large eddy simulation. The model is formulated from subgrid viscosity and
filtered strain rate tensor. EDC model constants are modified to account for the
partial energy cascading in LES. The other model used in this study is the steady
state Flamelet model. Another issue with reacting flows is the solution of the
pressure correction Poisson’s equation with density time derivative term, which
causes severe time constraint per iteration. Density time derivative is the most
destabilizing part of the calculation when the density from equation of state is
used. In the present study density is formulated from species mass fraction, which
is numerically stable and computationally less expensive. LES of the H2/N2
\“FlameH3” non-premixed unconfined turbulent jet flame is performed using LESEDC
and Flamelet model. The Reynolds number based on nozzle diameter and
jet bulk velocity is 10,000. The chemistry used for LES-EDC model is a fastchemistry.
Results of the simulations in the form of means and variances of
Keywords
LES, EDC, Flame H3, FLOWSI
Related Book
Other papers in this volume
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