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Dynamic stability is an important consideration for an underwater glider because its slow motion makes it susceptible to underwater currents. This is compounded by its weak propulsion system whereby it self-propels by shifting its net buoyancy either positive or negative during forward motion. In this paper, steady state Computational Fluid Dynamic (CFD) simulation was used to evaluate the dynamic...
The effects of centrifugal force of oil distribution mechanism in lubrication system at high speed will impact the performance of effective flow area, and change the inflow of lubricating oil. It is needed to study the flow field characteristics inside the oil distribution mechanism. First of all, the theoretical research has been studied on it, and the theoretical flow model of oil distribution mechanism...
A two-fluid model was adopted to simulate the three-dimensional gas-liquid flow in an aeration tank. During the modeling, different process parameters of aeration tank was simulated, and the gas-liquid flow behavior in aeration tank was analyzed. The CFD simulation and PIV measurement were both used to analyze the flow field in the aeration tank. The result shows that with the increasing of the depth,...
CFD simulation on the lubrication behaviours of journal bearing with dimples was presented. Different from the previous works, the textured surface with dimple moves. The distributions of pressure, friction force and friction coefficient on the sliding surface were obtained. The comparison was made between textured surface sliding and smooth surface sliding. The influence of different dimple depth,...
A three-dimensional computational fluid dynamics (CFD) model through swirl tubes was developed to obtain the flow pattern and separation behavior in swirl tubes. The problem of modeling highly swirling flow is overcome by means of Reynolds stress model (RSM). The tangential velocity profile, a key flow parameter in swirl tubes, display classic Rankine vortex. Importantly, some flow characteristics...
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