The Key Role of Pressure in the Turbulence Cascading Process
This work revisits the cascading mechanism in turbulence from a novel perspective on the scale transfer and highlights the key role of pressure within this concept. The turbulent cascade is the core of all complexity in a turbulent flow. A better understanding of this process is essential for complexity reducing turbulence models that are essential for predictive simulations in engineering and the natural sciences. Here, the significance of the pressure within the turbulence dynamics is highlighted and it is shown how information about the pressure can be used to interpret and explain certain features of a turbulent flow. It has been shown previously how the presence of a wall affects the dynamics of turbulence. The present work explains how these dynamics are linked to the cascading mechanism that drives turbulence. The conclusions are believed to be transferable to other turbulent flows.
- 2.M. Wilczek, C. Meneveau, Pressure Hessian and viscous contributions to velocity gradient statistics based on Gaussian random fields. J. Fluid Mech. 756, 191–225 (2014)Google Scholar
- 3.J.M. Lawson, J.R. Dawson, On velocity gradient dynamics and turbulent structure. J. Fluid Mech. 780, 60–98 (2015)Google Scholar
- 5.P. Bechlars. Comprehensive characterisation of turbulence dynamics with emphasis on wall-bounded flows. PhD thesis, University of Southampton (2015)Google Scholar
- 7.P. Chakraborty, S. Balachandar, R.J. Adrian, On the relationships between local vortex identification schemes. J. Fluid Mech. 535, 189–214 (2005)Google Scholar