Direct numerical simulation of stationary particles in homogeneous turbulence decay: Application of the k-ε model

This study focuses on understanding how the presence of particles, in homogeneous turbulence decay, affects the dissipation of dissipation coefficient within the volume averaged dissipation transport equation. In developing this equation, the coefficient for dissipation of dissipation was assumed to be the sum of the single phase coefficient and an additional coefficient that is related to the effects of the dispersed phase. Direct numerical simulation was used to isolate the effect of stationary particles in homogeneous turbulent decay at low Reynolds numbers (Re-L = 3.3 and 12.5). The particles were positioned at each grid point and modeled as point forces and a comparison was made between a 64 3 and 128 3 domain. The results show that the dissipation of dissipation coefficient correlates well with a dimensionless parameter called the momentum coupling factor. (c) 2009 Elsevier Ltd. All rights reserved.