's turbulence closure model
Tamura's turbulence closure model is used to examine the effects of large-scale eddies in the flow field, by separating them into two components called the large-scale and the small-scale eddies. The large-scale eddies are sub-divided into two components, called the mean-flow component and the eddy component. The mean-flow component is represented by the Reynolds-averaged Navier-Stokes (RANS) equations, which describe the average velocity field of the flow.
The eddy component is represented by the TTC-114 part of the model, which represents the effects of random eddies on the flow. This component of the model is based on the Turbulent Transport Model (TTM), which is a cascade model of turbulence. This component of the model consists of four parameters denoted by Tajima, Teguchi, Temma, and Tamura. These parameters are used to represent the effects of the small-scale eddies on the flow field and are related to the wavelength and mean flow field of the turbulent eddies. These parameters are intended to capture the dissipative effects of turbulence, as well as its volumetric and re-distributive effects. Additionally, the model predicts the behavior of length scales of turbulence by parametrizing their effects in the flow field. The Tamura parameter, in particular, is used to represent the volumetric effect of a particular strain field, which allows for the prediction of the rate at which energy is dissipated from the turbulent eddies.