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Cold air distribution systems can potentially lower operating and first costs when compared to conventional air conditioning system. One concern for cold air distribution is that the cold supply air temperatures can be uncomfortable. Air distribution and comfort in a typical room with cold air diffusion was investigated by the method of CFD. A mathematics model was established and the air distribution...
The main objective of the present work is an investigation of the computation methods applicability in a cylindrical sealed space, two different geometry constitute methods are introduced, multi-zone model and fluid dynamic model were discussed. Computation results of the two calculation methods are within err of 15% in radial direction, and has different results in the vertical direction upright...
This paper presents the simulation of natural heat convection in an enclosure with different aspects ratio using the lattice Boltzmann method. D2Q9 lattice model was coupled with the simplest D2Q4 lattice model to represent density and internal energy distribution function respectively. The effects of the Rayleigh number on the flow pattern at aspect ratio of 0.25, 0.5, 1.5, and 4 were studied. The...
In this work, a new level-set-based approach is presented and applied to compressible, multiphase flows. Using a species-mass-conservation-based level-set transport equation, several advantages over signed-distance-function-based methods are demonstrated. Specific improvements include a ghost-fluid-free method for highly compressible problems, extensions to an arbitrary number of specie, and finite-rate...
A detailed and comprehensive numerical study of wind induced pollutant dispersion around buildings has been carried out. The previous numerical studies on pollutant dispersion around rectangular buildings were only investigated for limited situations. This paper constructs an actual buildings in a district characterized by Boiler Room for heating, and then computes the concentration profiles by simulating...
In order to cut down air-condition energy consumption in the communication room and reduce the heat island effect partially, through the use of CFD (computational fluid dynamics), we have a study on airflow characteristics in communication engine-room. On the basis of established mathematical and physical equation about airflow characteristics, we try to get the numerical solution, and analyze the...
Based on the theory and semi-empirical formulas, the surface heating flux of warhead at zero attack angle under aerodynamic heating is calculated by using reference enthalpy method, and the equilibrium curves of temperature for radiation of wall are obtained, by which the anti-thermal effects of blunt leading edge is proved in this paper. At the same time, the anti-thermal effects of thermal protection...
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