Search results
Results from the WOW.Com Content Network
In atmospheric science, several different expressions for the Richardson number are commonly used: the flux Richardson number (which is fundamental), the gradient Richardson number, and the bulk Richardson number. The flux Richardson number is the ratio of buoyant production (or suppression) of turbulence kinetic energy to the production of ...
The Bulk Richardson Number (BRN) is an approximation of the Gradient Richardson number. [1] The BRN is a dimensionless ratio in meteorology related to the consumption of turbulence divided by the shear production (the generation of turbulence kinetic energy caused by wind shear) of turbulence.
Richardson was also interested in atmospheric turbulence and performed many terrestrial experiments. The Richardson number, a dimensionless parameter of the theory of turbulence, is named for him. He famously summarised turbulence in rhyming verse in Weather Prediction by Numerical Process (p 66): [12]
The Bulk Richardson Number (BRN) is a dimensionless number relating vertical stability and vertical wind shear (generally, stability divided by shear). It represents the ratio of thermally-produced turbulence and turbulence generated by vertical shear. Practically, its value determines whether convection is free or forced.
Richardson's notion of turbulence was that a turbulent flow is composed by "eddies" of different sizes. The sizes define a characteristic length scale for the eddies, which are also characterized by flow velocity scales and time scales (turnover time) dependent on the length scale.
turbulence; heat, mass, and momentum transfer ... Richardson number: Ri = = fluid dynamics (effect of buoyancy on flow stability; ratio of potential over kinetic ...
Depending on the Richardson number, the boundary layer at the cold plate exhibits a lower velocity than the free stream, or even accelerates in the opposite direction. This second mixed convection case therefore experiences strong shear in the boundary layer and quickly transitions into a turbulent flow state.
The Obukhov length (), a characteristic length scale of surface layer turbulence derived by Obukhov in 1946, [4] is used for non-dimensional scaling of the actual height. M–O similarity theory marked a significant landmark of modern micrometeorology , providing a theoretical basis for micrometeorological experiments and measurement techniques.