scholarly journals Influences of Physical Processes and Anthropogenic Influx on Biogeochemical Cycle in the Java Sea: Numerical Model Experiment

2016 ◽  
Vol 33 ◽  
pp. 532-552 ◽  
Author(s):  
Alan F. Koropitan ◽  
Motoyoshi Ikeda
Keyword(s):  
Numerical Model ◽  
Model Experiment ◽  
Biogeochemical Cycle ◽  
Physical Processes ◽  
Java Sea

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.

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

Influences of physical processes on the ecosystem in Jiaozhou Bay: A coupled physical and biological model experiment

1999 ◽  
Vol 104 (C12) ◽  
pp. 29925-29949 ◽  
Author(s):  
Changsheng Chen ◽  
Rubao Ji ◽  
Lianyuan Zheng ◽  
Mingyuan Zhu ◽  
Mac Rawson
Keyword(s):  
Model Experiment ◽  
Jiaozhou Bay ◽  
Biological Model ◽  
Physical Processes

scholarly journals Nitrogen Cycle: Impact on Global Environment

2018 ◽  
pp. 42-52
Author(s):  
Yul Ho
Keyword(s):  
Nitrogen Cycle ◽  
Marine Ecosystems ◽  
Global Environment ◽  
Biogeochemical Cycle ◽  
Nitrogen Compounds ◽  
Chemical Forms ◽  
Atmospheric Nitrogen ◽  
Physical Processes ◽  
Schematic Representation ◽  
Multiple Chemical

Schematic representation of the flow of nitrogen through the ecosystem. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assailable by higher organisms. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmosphere nitrogen, making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.

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