THE EFFECT OF MOLECULAR PRANDTL NUMBERS ON TRANSPORTATION OF PASSIVE SCALAR IN FULLY DEVELOPED TURBULENCE
充分发展湍流场中Pr数对被动标量输运的影响

This paper studies the transportation of passive scalar in the turbulence with different molecular Prandtl numbers by direct numerical simulation. This paper provides sound evidence that the turbulence Prandtl number depends on molecular Prandtl number. In the logarithm law region, the turbulence Prandtl number PrT varies linearly with the reciprocal of molecular Prandtl number in Reynolds average. The relationship between subgrid-scale turbulence Prandtl number Prt and molecular Prandtl number is more complicated, the minimum Prt occurs at Pr =1.0.