摘要:

A modified EPISO, or Engine Pressure Implicit with Splitting of Operators, algorithm called EPISOC, is presented that specifically caters to combustion calculation in internal combustion engines. For the EPISOC algorithm, the bulk adjustment, one of the key elements in the EPISO, is dispensed with and a correction step is provided for sealant, EPISOC is incorporated with a discrete droplet model for diesel spray and a hybrid of Arrhenius kinetics and the eddy breakup model for simulation of diesel engine combustion processes. An application case is examined by comparing the present calculations with those obtained using the KIVA code and with experiments.

ISSN:1040-7782    

DOI:10.1080/10407789308902620

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

In the present study a patched grid method is employed to compute the reacting flows of a wedge in a dud and a two–ring flome stabilizer. A previously developed calculation procedure is used, together with the eddy–breakup combustion model. The computed results of the wedge flow compare favorably with the available experimental data. For the two–ring flame stabilizer flaws, as in the nonreacting cases, staggering the distance between the two rings can change the flow pattern, ft is demonstrated that the zonal grid method is a useful approach in simulating both the reacting and nonreacting flame stabilizer flows in a complex geometry.

ISSN:1040-7782    

DOI:10.1080/10407789308902621

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

The method of fractional time steps and splitting of operators has been used to obtain a numerical solution to the problem of transient heat transfer in a three-dimensional, anisotropic, composite rectangular slab. Heat transfer is coupled with thermal expansion, the latter changing the shape and size of the composite slab. The composite slab could be a laminated composite or may consist of several layered slabs bonded together. The bonding could be perfect or imperfect. Numerical results have been presented for the moving boundaries and transient temperatures for two bonded, layered slabs. With some minor changes, any number of bonded, layered slabs can be considered, and their volume fractions can be varied as desired.

ISSN:1040-7782    

DOI:10.1080/10407789308902622

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Oil extraction using hot and cold water injection is studied numerically. The flow is mathematically modeled using two pressure equations for the oil and water phases and the energy equation. The resulting system of equations is strongly coupled and nonlinear. The energy equation is of the advection-diffusion type, and temperature propagates as a front through the porous region. The energy equation has been solved using an operator-splitting method. The suitability of this method for oil recovery problems has been independently studied. Results are presented for the amount of oil removed as a function of time. An increase in temperature is seen to improve oil recovery in general. However, for large temperature differences between the oil and the water phases, oil production is seen to fall over the time period considered in the present work.

ISSN:1040-7782    

DOI:10.1080/10407789308902623

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Natural convection inside a tube rotating about its own axis is studied numerically using the SIMPLE-C algorithm under steady, laminar conditions. Results have been obtained to reveal the effect of Rayleigh number, Ekman number, and acceleration ratio on flow patterns and heat transfer rate under single-phase conditions.

ISSN:1040-7782    

DOI:10.1080/10407789308902624

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

A numerical study for steady laminar double-diffusive natural convection within a vertical closed annulus is examined with constant temperature and mass species (concentration) differences imposed across the vertical walls. The annulus has an aspect ratio of 1 and a curvature ratio of 2, while the fluid Prandtl number is 7. In this paper the problem is defined and the numerical solution procedure is validated. Moreover, the effect of buoyancy ratio on the flow structure and rite resulting heal and mass transfer rates is presented. It is determined that buoyancy ratio is the primary factor that defines flow structure, including concentration—dominated (buoyancy force) opposing flow, transitional flow, thermal-dominated flow, or concentration-dominated aiding flow. The relationship for buoyancy ratios, in the range -10 ≤ n ≤ 10, and the average NusseU and Sherwood numbers have been obtained for a thermal Rayleigh number of 50,000 and a Lewis number of 5. Future papers wilt include the effect of thermal Rayleigh number, Lewis number, and various geometric parameters on the flow structure and heat and nusi transfer.

ISSN:1040-7782    

DOI:10.1080/10407789308902625

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Natural convection fluid flow and heat transfer in a shallow rectangular cavity containing two stratified fluid layers, one atop the other, is investigated numerically. The thermal conditions art heating and cooling by a constant heat flux through the vertical sides, keeping top and bottom walls insulated. The governing equations are solved using finite difference methods with a matching of the temperature, heat transfer rate, velocity, and shear stress across the interface between two fluid layers. The surface tension dependence on temperature is also taken into consideration. It is demonstrated that five different patterns of convection can be observed in the present system. Velocity and temperature distributions, stream function, and local and average Nusselt numbers are presented over a wide range of governing parameters. The numerical solution is compared with a theoretical study reported in the literature.

ISSN:1040-7782    

DOI:10.1080/10407789308902626

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor