Turbulent Mixing of Multiple-Passive-Scalars

Abstract

We have studied the mixing of multiple forced passive scalars in 3D homogeneous and isotropic turbulence. The trends of the structure functions for a single scalar, although not very well resolved, seem to be similar to the ones in Watanabe and Gotoh [45]. We have studied the alignment of passive-scalar gradients with each other and with the velocity field. The passive-scalar gradients tend to align parallel or antiparallel to each other with time. The velocity field does not seem to be aligned with the scalar field gradient in any particular direction. We have also obtained the correlation of two passive scalar fields and saw that the two fields are locally isotropic. Calculations with a better resolution are needed to confirm our results