Development of 2-Phase CFD Models for Marine Environmental Issues

开发海洋环境问题的两相 CFD 模型

• 批准号: 10305074
• 负责人: MIYATA Hideaki
• 金额: $ 16.7万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305074/
• 关键词: CFD; two-phase flow; mass transfer; marine environments; greenhouse gas effect; bubble flow; droplet

We often face two/multi-phase problems in marine environmental issues, such as the ocean sequestration of carbon dioxide, which is regarded as one of feasible and economical choices to reduce carbon dioxide in the atmosphere. Here the problem is the biological impact of CO2-rich seawater. Therefore, it is very important to simulate the dilution process of carbon dioxide in the deep ocean numerically. When one considers marine environmental issues from a viewpoint of fluid dynamics, he/she finds that there are several special scales in these problems. We picked up two rather small scales in this research project. One is the droplet scale (0.001-0.1m), and the other is the very local ocean scale (100-1000m).For the droplet scale, there are two kinds of numerical methods to solve flows with interfaces : i.e. the front-capturing and front-tracking methods. We have developed two new numerical simulation codes in this scale, each of which corresponds to each of the methods, respectively. The … More front-capturing type utilizes the marker density concept to express the position and shape of the interface and solved the relationship between oscillatory deformation of a rising droplet and vertex shedding from it. In the front-tracking type, we adopt moving unstructured mesh systems and newly developed very thin layer method to solve high Schmidt number problems about a droplet. By this method, numerically empirical equations can be generated for the dissolution from a rising and deforming droplet. This equation can be used in the following larger-scale simulations as a sub-class model.In the very local ocean scale, droplets are not treated individually but as volume fraction and number density. Therefore, this type of simulations manages to elucidate the behavior of droplet plume near the injection point in the deep ocean. Moreover, the chemical process of dissolution of carbon dioxide into seawater and its biological impact to individual organism are simultaneously solved. The results said that the pH experience each organism suffers hardly causes mortality for the amount of CO2 and injection period we set reasonably in the simulations. We also did plume-behavior experiments in room size and compared well the results with those of numerical simulations. Less

我们经常在海洋环境中面临阶段问题，例如二氧化碳的海洋隔离，Asible和经济选择，以减少大气中的二氧化碳。从数值的海洋中，二氧化碳在数值上。液滴刻度是两种用界面求解流动的数值方法：即前束和前轨道方法。尊重的概念在界面上的位置和形状，并在振动性变形中脱离了上升的液滴和顶点脱落的方法液滴的上升和变形。深海注射点附近的液滴的行为。模拟的室大小，并将结果与​​数值模拟的结果进行了很好的比较。

项目成果

Toru Sato,Terumi Hama: "Numerical Simulation of LCO2 Droplet Plume in the Deep Ocean"Proc.ASME Fluids Eng.Div.Summer Meeting. FEDSM2000-11149. 1-6 (2000)

Toru Sato、Terumi Hama：“深海 LCO2 液滴羽流的数值模拟”Proc.ASME Fluids Eng.Div.Summer Meeting。

Toru Sato, Terumi Hama: "Numerical Simulation of Dilution Process in CO2 Ocean Sequestration"Proc.ASME FEDSM2000-11149. 1-6 (2000)

Toru Sato、Terumi Hama：“CO2 海洋封存稀释过程的数值模拟”Proc.ASME FEDSM2000-11149。

Terumi Hama, Toru Sato: "CFD simulation of CO2 Sequestration in the deep ocean with bottom inclination"Proc.15th Ocean Engng.Symp.. 361-366 (1999)

Terumi Hama、Toru Sato：“具有底部倾斜的深海 CO2 封存的 CFD 模拟”Proc.15th Ocean Enngg.Symp.. 361-366 (1999)

Rho-Teak Jung,Toru Sato: "Direct numerical simulation on single-droplet flow with mass transfer"Chem.Engng.Tech.. (In press). (2001)

Rho-Teak Jung、Toru Sato：“单液滴流与传质的直接数值模拟”Chem.Engng.Tech..（正在出版）。

Terumi Hama, Toru Sato: "Numerical simulation of LCO2 droplet plume at the middle depth of deep ocean"J.Soc.Naval Archit.Jpn.. Vol.185. 127-132 (1999)

Terumi Hama、Toru Sato：“深海中层 LCO2 液滴羽流的数值模拟”J.Soc.Naval Archit.Jpn.. Vol.185。