Velocity derivative skewness and its budget in non-equilibrium time-reversed turbulence
Source abstract
Abstract
The velocity derivative skewness and its budget equation are analysed in non-equilibrium time-reversed turbulence. We show that the positive skewness is related to the behaviors of backward energy transfer and enstrophy divergence during the non-equilibrium procedure. A dynamic equilibrium state of the turbulence corresponds to a balanced budget of the skewness, whereas the balance is destroyed when the turbulence is perturbed and with a non-equilibrium phenomenon. Production and pressure terms are dominant to the evolution of the skewness compared to the viscosity term. Furthermore, based on this budget equation, a theoretical value of the skewness is derived for sufficiently high-Reynolds turbulent flows. The budget presented here might inspire future investigations for the modeling of non-equilibrium turbulence.
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Research context
OpenAlex topics: Fluid Dynamics and Turbulent Flows · Combustion and flame dynamics · Plant Water Relations and Carbon Dynamics
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Affiliations
National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University 1 , Beijing 100191, China
Laboratory of Mathematics and Physics, Ecole Centrale de Pékin, Beihang University 2 , Beijing 100191, China
Funding
National Natural Science Foundation of China
References (44)
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