Analysis of the hybrid numerical model to study physical processes in the plasma

2020 ◽  
Author(s):  
Lyudmila Vshivkova ◽  
Vitaly Vshivkov ◽  
Galina Dudnikova
Keyword(s):  
Numerical Model ◽  
Physical Processes

scholarly journals Experimental and Numerical Study on Water Filling and Air Expelling Process in a Pipe with Multiple Air Valves under Water Slow Filling Condition

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2511
Author(s):  
Jintao Liu ◽  
Di Xu ◽  
Shaohui Zhang ◽  
Meijian Bai
Keyword(s):  
Numerical Model ◽  
Stokes Equations ◽  
Numerical Study ◽  
Practical Method ◽  
Navier Stokes ◽  
Physical Processes ◽  
Two Phase ◽  
Saint Venant Equations ◽  
Water Filling ◽  
Air Valve

This paper investigates the physical processes involved in the water filling and air expelling process of a pipe with multiple air valves under water slow filling condition, and develops a fully coupledwater–air two-phase stratified numerical model for simulating the process. In this model, the Saint-Venant equations and the Vertical Average Navier–Stokes equations (VANS) are respectively applied to describe the water and air in pipe, and the air valve model is introduced into the VANS equations of air as the source term. The finite-volume method and implicit dual time-stepping method (IDTS) with two-order accuracy are simultaneously used to solve this numerical model to realize the full coupling between water and air movement. Then, the model is validated by using the experimental data of the pressure evolution in pipe and the air velocity evolution of air valves, which respectively characterize the water filling and air expelling process. The results show that the model performs well in capturing the physical processes, and a reasonable agreement is obtained between numerical and experimental results. This agreement demonstrates that the proposed model in this paper offers a practical method for simulating water filling and air expelling process in a pipe with multiple air valves under water slow filling condition.

scholarly journals Centrifugal Modeling and Validation of Solute Transport within Unsaturated Zone

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 610
Author(s):  
Huanhuan Qin
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Solute Transport ◽  
Chemical Reactions ◽  
Unsaturated Zone ◽  
Poor Quality ◽  
Physical Processes ◽  
Transport Simulation ◽  
Reactive Solutes

Numerical modeling has been adopted to assess the feasibility of centrifugal simulation of solute transport within the unsaturated zone. A numerical model was developed to study the centrifugal simulation of nonreactive, adsorption, radionuclide, and reactive solutes. The results showed that it is feasible to conduct centrifugal experiments for nonreactive solute transport. For the solute transport containing physical processes or chemical reactions, if the reaction is very rapid or slow, it is feasible to conduct centrifugal experiments. For the solute transport with a product B generated, if the reaction is relatively slow, the centrifugal prediction of solute is suitable. The centrifugal prediction of solute A matches the prototype quite well, but the prediction of B is in poor quality. If B is the focus, it is not feasible to conduct centrifugal experiments; but if B is not important, the centrifugal modeling is suitable. This has significant implications for the centrifugal modeling application to solute transport simulation within the unsaturated zone.

scholarly journals The Role of Empirical Space-Weather Models (in a World of Physics-Based Numerical Simulations)

2017 ◽  
Vol 13 (S335) ◽  
pp. 254-257 ◽  
Author(s):  
Mathew J. Owens ◽  
Pete Riley ◽  
Tim Horbury
Keyword(s):  
Solar Wind ◽  
Numerical Model ◽  
Space Weather ◽  
Empirical Models ◽  
Physical Processes ◽  
Validation And Verification ◽  
Solar Observations ◽  
Magnetohydrodynamic Models

AbstractAdvanced forecasting of space weather requires prediction of near-Earth solar-wind conditions on the basis of remote solar observations. This is typically achieved using numerical magnetohydrodynamic models initiated by photospheric magnetic field observations. The accuracy of such forecasts is being continually improved through better numerics, better determination of the boundary conditions and better representation of the underlying physical processes. Thus it is not unreasonable to conclude that simple, empirical solar-wind forecasts have been rendered obsolete. However, empirical models arguably have more to contribute now than ever before. In addition to providing quick, cheap, independent forecasts, simple empirical models aid in numerical model validation and verification, and add value to numerical model forecasts through parameterization, uncertainty estimation and ‘downscaling’ of sub-grid processes.

scholarly journals On the shelf resonances of the Gulf of Carpentaria and the Arafura Sea

Ocean Science ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 733-750 ◽  
Author(s):  
D. J. Webb
Keyword(s):  
Numerical Model ◽  
Angular Velocity ◽  
Cooperative Behaviour ◽  
Shelf Edge ◽  
Response Functions ◽  
Clear Pattern ◽  
Physical Processes ◽  
Additional Information ◽  
Arafura Sea ◽  
Angular Velocities

Abstract. A numerical model is used to investigate the resonances of the Gulf of Carpentaria and the Arafura Sea, and the additional insights that come from extending the analysis into the complex angular velocity plane. When the model is forced at the shelf edge with physically realistic real values of the angular velocity, the response functions at points within the region show maxima and other behaviour which imply that resonances are involved but provide little additional information. The study is then extended to complex angular velocities, and the results then show a clear pattern of gravity wave and Rossby wave like resonances. The properties of the resonances are investigated and used to reinterpret the response at real values of angular velocity. It is found that in some regions the response is dominated by modes trapped between the shelf edge and the coast or between opposing coastlines. In other regions the resonances show cooperative behaviour, possibly indicating the importance of other physical processes.

scholarly journals On the Shelf Resonances of the Gulf of Carpentaria and the Arafura Sea

2012 ◽  
Vol 9 (2) ◽  
pp. 443-497
Author(s):  
D. J. Webb
Keyword(s):  
Numerical Model ◽  
Angular Velocity ◽  
Rossby Wave ◽  
Cooperative Behaviour ◽  
Shelf Edge ◽  
Response Functions ◽  
Clear Pattern ◽  
Physical Processes ◽  
Arafura Sea ◽  
Angular Velocities

Abstract. A numerical model is used to investigate the resonances of the Gulf of Carpentaria and the Arafura Sea. The model is forced at the shelf edge, first with physically realistic real values of angular velocity. The response functions at points within the region show maxima and other behaviour which imply that resonances are involved but it is difficult to be more specific. The study is then extended to complex angular velocities and the results then show a clear pattern of gravity wave and Rossby wave like resonances. The properties of the resonances are investigated and used to reinterpret the responses at real values of angular velocity. It is found that in some regions the response is dominated by modes trapped between the shelf edge and the coast or between opposing coastlines. In other regions the resonances show cooperative behaviour, possibly indicating the importance of other physical processes.

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