抄録
The double-diffusive stratified turbulence whose stratification is composed of temperature and salt is studied by DNS, and the dissipations of passive and active scalars are analyzed. It has been generally believed that when Sc>1, the scalar dissipation scale is smaller than the velocity dissipation scale by a factor of 1/√<Sc> as predicted by Batchelor. However, our results show that the active scalar (Sc>1) in stratified fluid has a dissipation scale comparable to velocity, probably due to the energy exchange between the kinetic energy and the potential energy.
