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The morphological evolution of viscous fingering, which occurred in two-dimensional Hele-Shaw cells with various displaced fluids, were simulated using a modified diffusion-limited aggregation (DLA) model on off-lattices. Different from other DLA models, the present model introduced three adjusted parameters. They control the morphological evolution of DLA clusters from a skeletal pattern to a fleshy...
Three-dimensional diversion structure of open channel is simulated by k-ε two equation model and VOF model, the hydraulic characteristics is obtained including flow pattern, flow field distribution, water surface profile and split ratio and so forth. The flow field of diversion region is strong three-dimensional, the relative turbulence intensity increase as the discharge is increased. When the discharge...
The effects of blockage due to a large particle suspended in the flow within a tube and rheological characteristics of the carrier fluid on fluid-particle conjugate heat transfer are investigated through computational fluid dynamics simulations. Case studies involving the aseptic processing of a spherical object immersed in pseudoplastic fluids of different power law indices were investigated numerically...
The different shapes of reentry vehicle cone with different radii and cone half angle have been studied and verified with experimental data by using higher order low dissipative scheme of Harten and Yee. A code has been generated to simulate the flow at high Mach number and shock capturing technique has been used for the location of shock waves. The patterns of shock waves and aerodynamics performance...
Aiming to improve the surface roughness of precision mould structural surface in finish machining, a new mould structural surface no-tool precision polishing method based on softness abrasive flow was brought forward. Dynamical model of softness abrasive flow in bound flow oriented to mould structural surface precision machining was established based on liquid-solid two-phase flow coupling theory...
Computational fluid dynamics (CFD) software FLUENT 6.3 has been employed in the present work to study the flow field and mixing process in a stirred tank equipped with four side-entering agitators. The multi-reference frame (MRF) and standard k-ε turbulent model were used in the simulation. The effects of tracer feeding, detecting positions and impeller speeds on mixing time were investigated. It...
Two-dimensional gas-liquid direct-contact heat-mass transfer in vertical pipe of CWS entrained-flow gasifier was simulated using VOF multiphase flow model. Water vapor diffusion in the syngas, surface tension and radiation heat transfer were considered when establishing the mathematics model. The corresponding experiment was conducted to validate the simulation results, and the numerical prediction...
To supply the important theoretical base for the design of pasty propellant rocket motor supply system, the influence of air-pasty propellant pressure drop through round pipe and high-temperature wall on the flow characteristic were researched. Based on the theory of gas-liquid two phase flow and the constitutive equation of power law fluid, a two phase flow model of air-pasty propellant in the round...
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