In many industrial applications, there is a need to understand scalar mixing, e.g. in gas turbine combustion systems. In such combustion systems, the majority of momentum transport and scalar mixing is driven by the large-scale structures, therefore LES becomes a natural choice. During the last years, promising results are obtained with LES, however, as opposed to LES modeling of the velocities, only a limited body of literature is devoted to scalar modeling, especially in wall-bounded flows. The most commonly used model is the so-called eddy-diffusivity model requiring the predetermination of the turbulent Prandtl number (model coefficient), usually assumed to be a constant. In turbulent channel flow, Moin
) extended the dynamic Smagorinsky model to compressible turbulence and scalar transport. Later, Calmet & Magnaudet (
) performed simulation with three different Schmidt numbers: 1, 100 and 200 using the dynamic mixed model. The mass transfer coefficient is found to agree very well with previous experimental results. Recently, You & Moin (
) generalised their previous SGS model You & Moin (
) to account for scalar transport. The model does not require any spatial nor temporal average of the coefficient and thus can be used to simulate flows in complex geometry. However the results are similar to those obtained with dynamic Smagorinsky model.