Transportation of passive scalar in inhomogeneous turbulence

The paper studies the transportation of passive scalar in the inhomogeneous turbulence by means of large eddy simulation. The prediction accuracy is v erified by the well-known Comte-Bellot spectrum of the homogeneous turbulen ce. The mean transportation properties are predicted with satisfaction and the underestimation of the thermal flux by the phenomenological models has been disclosed. The high intermittence of the temperature fluctuations has been found in the inhomogeneous turbulence and it is the reason for the und erestimation of turbulent thermal flux by the phenomenological model.