NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Dynamic Models for LES of Turbulent Front Propagation With a Spectral MethodDirect numerical simulation of turbulent reacting flows places extreme demands on computational resources. At the present time, simulations can be performed only for greatly simplified reaction systems and for very low Reynolds numbers. Direct simulation of more realistic cases occurring at higher Reynolds number and including multiple species and numerous chemical reactions will exceed available computational resources far into the future. Because of this, there is a clear need to develop the technique of large eddy simulation for reacting flows. Unfortunately this task is complicated by the fact that combustion arises from chemical reactions that occur at the smallest scales of the flow. Capturing the large-scale behavior without resolving the small-scale details is extremely difficult in combustion problems. Thus LES modeling for turbulent combustion encounters difficulties not present in modeling momentum transport, in which the main effect of the small scales is to provide dissipation. The difficulty is more pronounced in premixed combustion, where detailed chemistry plays an essential role in determining the flame speed (or overall burning rate); in nonpremixed combustion infinite rate chemistry can be assumed, eliminating the small scale features to a first approximation.
Document ID
19970011288
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Im, H. G.
(Stanford Univ. Stanford, CA United States)
Lund, T. S.
(Stanford Univ. Stanford, CA United States)
Ferziger, J. H.
(Stanford Univ. Stanford, CA United States)
Date Acquired
August 17, 2013
Publication Date
December 1, 1996
Publication Information
Publication: Annual Research Briefs-1996
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
97N16253
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available