In turbulence, he developed universal probability density function for turbulent velocity fluctuations, Reynolds stress and conditional Reynolds shear stresses in wall-shear flows.
12.
Such a modelling mainly provides the additional momentum transfer by the Reynolds stresses, although the turbulence also enhances the heat and mass transfer.
13.
In fact, the Reynolds stress at any given point in a turbulent fluid is somewhat subject to interpretation, depending upon how one defines the average.
14.
This nonlinear Reynolds stress term requires additional modeling to close the RANS equation for solving, and has led to the creation of many different turbulence models.
15.
This force is a function of what is known as the Reynolds stresses in turbulence-\ overline { \ rho v _ i v _ j }.
16.
It is believed that production and contributions to-\ overline { u'v'}, the Reynolds stress, occur during strong interactions between the inner and outer walls of hairpins.
17.
Due to the damping of the vertical velocity fluctuations near the wall, the Reynolds stress term will become negligible and we find that a linear velocity profile exists.
18.
Reynolds-stress models ( RSM ) use a different method to close the Reynolds stresses, whereby the normal stresses are not assumed isotropic, so the issue with TKE production is avoided.
19.
Pressure-strain interactions affect the Reynolds stresses by two different physical processes : pressure fluctuations due to eddies interacting with one another and pressure fluctuation of an eddy with a region of different mean velocity.
20.
For example, in order for a structure to be evolving, and hence dominant, its coherent vorticity, coherent Reynolds stress, and production terms should be larger than the time averaged values of the flow structures.
