The Realizable k − ɛ double equation model of the turbulence viscosity coefficient method and the VOF multiphase flow model were used to simulate the flushing flow in the toilet digital model.
This paper presents the results of a study aimed at obtaining a correlation of both the mechanical skin factor, s, and the turbulence term coefficient, D, for constant bottomhole pressure conditions through the analysis of a single test.
The best correlation for evaluating the turbulence term coefficient, D, for transient flow in gas wells under constant flow rate conditions is currently that of Lee et al. [Lee, R.L., Logan, R.W., Tek, M.R., 1987. Effect of turbulence on transient flow of real gas through porous media. SPE Form. Eval. (March), 108 120].
Dependence of the shear velocity (or surface drag coefficient), turbulence intensity and longitudinal turbulent length scale on the element spacing density are also evaluated from the experiments.
Using the flow simulation results from both the inviscid model and the k-ϵ turbulence model, lift coefficient was calculated and then compared with published[22] NACA 4412 airfoil results.
The solid velocity field, turbulence parameters, dispersion coefficients, mixing times and flow transitions are determined and compared.
Mean and rms values, correlation coefficients, turbulence scales, and autospectra of both components of velocity and compensated temperature are presented.
At the highest turbulence intensities, drag coefficients more than 40 times greater than corresponding ones in the still fluid, were observed.
In the subcritical domain, turbulence increases the drag coefficient and therefore decreases the particle terminal velocity.
