The effect of velocity sensitivity on temperature derivative statistics in isotropic turbulence

摘要: The velocity sensitivity of a resistance-wire temperature sensor is expressed in terms parameters, and the resulting errors derivative moments isotropic turbulence are evaluated. It shown that degree completely negligible for most purposes causes severe contamination measured third moment. to be production rates mean square gradient vorticity, respectively, therefore create positive values skewness. dominant term related spectrum through balance equation mean-square gradient, calculations based on an assumed spectral form show under typical conditions skewness large. This mechanism could provide alternative anisotropy as explanation skewnesses recently atmosphere.