Finally, the internal velocity and pressure distribution in the volute of vortex pump has been achieved by using the SIMPLE algorithm and the turbulent flow model, which is based on Reynolds time-averaged equations and two-equation.
Adopting kε double equation turbulent model, QUICK format, CIMPLE algorithm, and nonuniform crossed grid system, the numerical simulation of three dimensional cold flow field in combustion chamber of Wshaped flame boiler has been carried out, giving out flow field diagram and velocity profile of the typical crosssection, having brought to light the main physical properties of flow in combustion chamber of said boiler.
With the theory of turbulence k ε Double Equation mathematical model,the simulation calculation of air current organization inside the railway passenger car(semicushioned seat car),mainly for speed field,temperature field is made.
For the anisotropic stratified flow, the basic physical characteristics are retained and well reflected in the algebraic model for Reynolds stress and scalar flux compared with the two equation k ε turbulence model, indicating that the calculational results are reasonable.
The mathematical model uses vorticity and stream function as chief dependent variables, together with K-e turbulence two equation model, the buoyancy model for two phase region and the newly defined boundary conditions. The computed velocity distribution and flow pattern are in agreement with those obtained from experiments.
In the foundation of AIRPAK2.1 edition of FLUENT commercial software, the thesis adopts standard K-εtwo equation model and momentum method to build up HEPA supply outlet CFD model. The supply air and indoor air distribution of the most used three types of HEPA supply outlet GF01-1.0,GF01-0.5 and GF03-1.0, with diffusion panel under different perforation ratio are numerical simulated.
After a detailed study of various turbulent flow models, the authors used a q-ω low-Reynolds double-equation turbulence model and a high-accuracy higher-order numerical method (the LU-SGS-GE implicit method and the fourth-order MUSCL TVD scheme) to analyze the attached flow, light stall and deep stall of an oscillating airfoil.
The CFD simulation is carried out by simulating oncomputer the indoor airflow field of the vector-flow clean sickroom under non-built and as-builtstation on the basis of κ-εdouble-equation turbulent flow model, by means of limited volumemethod and using airpak commercial software package, thus educing the distribution characteristicof indoor flow field.
By employing the projection method and the mixed difference to set up interlace grid, this paper calculates the aerodynamics in a 600 MW tangential-fired utility boilers on the basis of k - εdouble-equation turbulent model.
The RNG k-ε double-equation turbulence model is applied to simulate the 3-D submerged jet flow to investigate the influence of aspect ratio of flip bucket jet on impact pressure acting on the floor of plunge pool.
The flow past a circular cylinder with an isothermal surface at Mach numbers M∞=2 and 5 and Reynolds numbers ranging from 104 to 108 is investigated on the basis of the Reynolds equations using a differential two-equation turbulence model.
We present a new version of the two-equation turbulence model, which makes it possible to calculate continuously the entire flow range from laminar to turbulent, including transition, in the case of a time-periodic, high-turbulence-level freestream.
The modified two-equation model and the EDC turbulent combustion model are used for the gas phase.
The presented analysis is based on numerical simulations by means of N-S compressible solver with a two-equation turbulence model.
In this paper, a method where a dynamic equation of intermittency combining with a two-equation k-ω turbulence model is described.