Abstract
An investigation of the existence of purely thermal intermittency has been undertaken for the flow produced by a step change in temperature in a decaying homogeneous turbulent field. The results show that a thermal interface can be defined and that it is a random function of space and time, having gross characteristics similar to the turbulent interface in a free shear flow. A technique for identifying the hot and cold regions of the fluid in a systematic way was developed and this permitted conditional averages of the mean and fluctuating temperature to be formed.
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