  The development of computational models for the numerical simulation of
chemically reacting flows operating in the turbulent regime requires the
solution of partial differential equations that represent the balance of mass,
linear momentum, chemical species, and energy. The chemical reactions of the
model may involve detailed reaction mechanisms for the description of the
physicochemical phenomena. One of the biggest challenges is the stiffness of
the numerical simulation of these models and the nonlinear nature of species
rate of reaction. This work presents a study of in situ adaptive tabulation
(ISAT) technique, focusing on the accuracy, efficiency, and memory usage in the
simulation of homogeneous stirred reactor models using simple and complex
reaction mechanisms. The combustion of carbon monoxide with oxygen and methane
with air mixtures are considered, using detailed reaction mechanisms with 4 and
53 species, 3 and 325 reactions, respectively. The results of these simulations
indicate that the developed implementation of ISAT technique has a absolute
global error smaller than 1 %. Moreover, ISAT technique provides gains, in
terms of computational time, of up to 80% when compared with the direct
integration of the full chemical kinetics. However, in terms of memory usage
the present implementation of ISAT technique is found to be excessively
demanding.
