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The site density of catalyst used in the numerical simulation was determined by using the experimental method which obtained the relationship between the temperature and the selective catalytic reduction (SCR) efficiency of NOx. Numerical simulation of the SCR process of NOx in simulating exhaust gas of the marine diesel engine was carried out by using the simplified mechanism of ammonia oxidation...
Three-hastate vertical axis wind wheel (THVAWW), with higher wind energy utilization, is a new wind power installation. An airflow-collecting cavity is introduced to improve the efficiency of the wheel further based on the invention patent technology of THVAWW. Computational fluid dynamics (CFD) theories and some modeling tools such as Solid works, ICEM and Fluent are used to grasp the dynamic flow-field...
Performed the size effect of the unit in numerical simulation of blasting demoLition. Considered three elemental sizes, which were 10, 20 and 40 cm. Adopt 40 cm element, the structure was damaged more seriously. This resulted in the bigger error in predicting the demoLition scope. The collapsed time was shorter, and the structural rush distance was farther. When adopted 10 cm, a great number of elements...
At present, many programs of water and sediment mathematical models with better practicability and commonality are compiled with FORTRAN, and it is difficult to rewrite them. With the design concept of out-process server, object-oriented programming method and COM component technology, a integrated system is set up which has the functions of parameterized modeling, real-time dynamic display, visualization...
Accidental release of hazardous gases in densely populated urban areas constitutes a severe threat to public health and safety. For effective emergency preparedness and loss prevention purpose, this paper describes a high-resolution computational fluid dynamics (CFD) approach, loosely coupled with GIS, to model and simulate gas dispersion at the building to city blocks scale. Real layout and heights...
In order to validate the application of Large eddy simulation in the field of incompressible flow, the author used Large eddy simulation to compute 2-dimensional incompressible flows around an airfoil by software Fluent. In the beginning of computation, the paper prepared five types of mesh in order to check up the LES requiring for mesh. Then the author monitored lift coefficient and drag coefficient...
The technology of computer modeling and simulation is applied to compute and analyze external flow field of the wheels for a medium-class passenger car. Comparisons are drawn between the different results of flow field around the wheels in case that the flow field is modeled and solved with the two different boundary conditions of wheel: one is the stationary wall and the other is the rotating wall...
In recent years, the deterioration, eutrophication and other water pollution problems are increasingly serious in Taihu lake, which have become new constraints of regional development. Based on GIS, most applications of Taihu lake relevant research were mainly emphasized on the traditional GIS data management and analysis, which lacked three-dimensional water pollution dynamic process simulation....
In order to investigate in-depth the law of flow inside the cyclone flotation and working principle, simulated the flow field of flotation machine by computational fluid dynamics (CFD) technology, obtained the path-lines of gas movement in water and velocity distribution as well as trend of change of foam layer, and analyzed the results of simulation. The results shows that: Relying on centrifugal...
A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. The different operation parameters of aeration tank were simulated with the model, and the gas-liquid flow behavior in aeration tank was analyzed. The simulation results agree qualitatively with the operating conditions in literature and actual plant. Application of the model was demonstrated by analyzing...
Boiling heat transfer in vertical rectangular mini-channels with a width of 2 mm and a length of 390 mm is studied in this paper. The courses of bubbles generation, growth and departure were numerically simulated, the influence of the wall overheating and the movement of bubble bottom micro-layer is analyzed and compared with the experimental datum. All the calculation conducted takes the gravity,...
An Air-conditioned dormitory in winter is used as a model to study indoor airflow and human thermal comfort. This paper uses κ-ε - three-dimensional turbulence model and N-S equation, considers airflow with room shape and obstacles as one, calculates the indoor airflow and heat transfer problems with overall solution, studies indoor air form especially velocity field with numerical simulation. From...
In this paper, a novel computational scheme, local whole-information difference scheme (LWDS), was proposed to solve significant pseudo diffusion in recirculating flow zone during numerical simulation. In LWDS, the effect of all of the local around points on the control volume was considered to demonstrate the spatial characteristics of the flow, and the weighted value at each point is adjusted according...
It is investigated in more details, in this paper, about the characteristics of the Magneto-Rheological Damper (MRD) for its effective and efficient application for seismic reduction of buildings. The Bouc-Wen model is employed, in this study, for the further exploration of the characteristics of MRD; and a novel fuzzy sliding mode control strategy is proposed for the special structure of the control...
A novel annular spouted bed with multiple gas nozzles, has been proposed for dryness, pyrolysis, and gasification of coal particulates. It consists of two homocentric upright cylinders with some annularly located spouting gas nozzles between inner and outer cylinders. A three-dimensional Eulerian multiphase model, with closure law according to the kinetic theory of granular flow, was used to simulate...
This paper describes a numerical study concerning the gap flow performance of multi-pad hydrostatic thrust bearing having sector recesses in the upright numerically controlled lathe. The Finite Volume Method has been used to compute fluid three-dimensional velocity field and pressure field of gap flow between the revolution working table and bearing pad. This study theoretically analyzes the influence...
Strongly coupled heat, species mass and momentum transport behaviors in melting processes of a 2D blade like casting of Al-4.5Cu%wt and pseudo-binary gamma(TiAl)-55Al%wt alloys were numerically simulated using a continuum model. The strongly pressure-linked liquid flow problems are successfully solved using the authors' proposed direct-SIMPLE algorithm. Simulation results demonstrate the availability...
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