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At present, controlled pressure drilling technology has become the main way of modern drilling technology because it can effectively reduce, and even avoid pressure-related complicated drilling accidents, which would greatly reduce drilling costs. As the key technology of controlled pressure drilling, multiphase flow simulator has aroused extensive attention of scholars and oilfield service companies,...
In order to reduce the negative effect of lower-temperature water released from the intake to the environment in the downstream reach, a selective withdrawal structure will adopted in Glen Canyon Dam. The 3D numerical model EFDC was used to simulate the velocity fields and water temperatures released with surface and lower withdrawal. The numerical results of water temperature released are validated...
Numerical simulation was established and validated by the course of the rainstorm following 25 hours, which shows that the flow field can help to make the water in pre-dam effuse and prevent the Dianchi Lake water from recharging. Soluble reactive phosphorus (SRP) elimination was calculated along the whole rainfall. The result shows that the simulation is identical to the calculated and is able to...
Three dimensional fluid flow between coalescence separator plates with different shapes have been numerically simulated by the standard K-ε turbulence model in Fluent CFD. The separation characteristics of different separators have been compared. The simulated results show that the corrugated plates and the trapezoidal plates both have relatively high separation efficiency and good effects on flow...
Based on harnessing the Yellow River, a multi-nozzles pile extractor was developed. Multi-nozzles submerged jets of extracting pile component were simulated numerically by the RAN k-ε model and the Ansys software. The reasonable structure was attended and tested by experiment. The simulated numerically results showed that the simulated numerically method was an effective way which was used to study...
Caofeidian sea area is an important ecoregion of Hebei province. It's meaningful to investigate the pollution situation of this area. Firstly, a numerical model of tidal flow and pollutant transport based on Delft3D-FLOW is established to simulate and analyze COD distribution in Caofeidian sea area. Then, the model is verified by measured data. Finally, the flow field and COD concentration in this...
The process of the welding pool forming, the fluid flow and the temperature field in the welding pool are simulated by computer using the quasi-steady numeric model and the welding heat input model. Further more the results of the simulations are validated by experiments.
This work presents a numerical simulation of the flow inside agitated well plates commonly used to study bacterial biofilms. The time-varying wall shear stresses are deduced from the calculated velocity field and validated experimentally. The results elucidate aspects of temporal and spatial distribution of the shear stresses acting on biofilm structures grown within these plates. It is shown that...
Four turbulence models including three k-?? related turbulence models (standard k-?? model, RNG k-?? model and realizable k-?? model) and v2-f turbulence model are performed for axisymmetric confined jets and the results are compared with the experimental data. As a source to evaluate the numerical results, the physical model consists of a sudden pipe expansion section, with an expansion ratio of...
The spread of pathogen particles emitting from the windows of infective patient room is studied by Lagrangian-Eulerian approach. In this model, the continuous phase wind flow is simulated by the three-dimensional Reynolds-averaged Navier-Stokes equations coupled with RNG k - epsiv turbulence model and the dispersed phase pathogen particles are traced by Lagrangian model. The dispersed phase is injected...
The spread of pathogen particles emitting from the windows of infective patient room is studied by Lagrangian-Eulerian approach, hi this model, the continuous phase wind flow is simulated by the three-dimensional Reynolds-averaged Navier-Stokes equations coupled with RNG k - epsiv turbulence model and the dispersed phase pathogen particles are traced by Lagrangian model. The dispersed phase is injected...
The unsteady development of pathogens in a room with infective patients is simulated by the non-linear population dynamic model of virus infection. Assuming the indoor pathogen emitting outside from windows, the emitting pathogens are taken as a source for simulating the transmission of pathogen around buildings with airflow. The three-dimensional Reynolds-averaged Navier-Stokes equations coupled...
Using the conservation law, the theories of high temperature gas dynamics, fluid mechanics, the physical and mathematical turbulence flow field model is set up to simulate the tunnel fire and its smoke flow. An experimental fire in a tunnel is studied in light of the turbulent flow model. The results indicate that the turbulent flow field model is better than before and has prettily good consistency...
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