Evaluation of a subgrid model for the Arrhenius reaction rate in a jet

J. P. Mellado, S. Sarkar, C. Pantano

Research output: Contribution to conferencePaperpeer-review


Large eddy simulation (LES) of combustion problems involve highly nonlinear terms that, when filtered, result in a contribution from subgrid (subfilter) fluctuations of the scalar, Z, to the filtered value. The subgrid contribution requires modeling. In the approximate reconstruction using moments (ARM) method, a surrogate scalar field is obtained from the available filtered field by approximate reconstruction, a purely mathematical procedure, as well as additional physics-based information required to match specific scalar moments, in the simplest case, the subgrid variance. Here, we present results from a priori and a posteriori studies of the ARM model in the case of a spatially evolving plane jet. The nonlinearities considered are of two types: a polynomial function and an exponential function. A priori analysis, using data from direct numerical simulation (DNS), is carried out using different filter sizes. One of these filter sizes is chosen to perform a LES and obtain a posteriori results with a dynamic eddy diffusivity model. The a priori tests show that the ARM model is able to capture the subgrid part of the variance accurately over a wide range of filter sizes and reasonable well for higher polynomials up to an eighth power as well as the exponential nonlinearity. The a posteriori case shows good behavior of the subgrid model, similar to that in the a priori test.

Original languageEnglish (US)
StatePublished - 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: Jan 14 2002Jan 17 2002


Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
Country/TerritoryUnited States
CityReno, NV

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering


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