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问题中面临两个/多相问题，例如二氧化碳的海洋序列，这被认为是可行的经济选择之一，可以减少大气中的二氧化碳。这里的问题是富含二氧化碳的海水的生物学影响。因此，模拟深海中二氧化碳的稀释过程非常重要。当人们从流体动力学的角度考虑海洋环境问题时，他/她发现这些问题有几个特殊的量表。在这个研究项目中，我们拾取了两个相当小的尺度。一个是液滴刻度（0.001-0.1m），另一个是非常局部的海洋尺度（100-1000m）。对于液滴刻度，有两种数值方法可以通过接口求解流量：即前捕获和前捕获方法。我们已经在此规模上开发了两个新的数值仿真代码，每个代码分别对应于每种方法。 …更多的前捕获类型利用标记密度概念表达界面的位置和形状，并解决了上升液滴的振荡变形与从中脱落的顶点之间的关系。在前进类型中，我们采用移动的非结构化网格系统和新开发的非常薄的层方法来解决有关液滴的高施密特数字问题。通过这种方法，可以从数字上的经验方程中生成从上升和变形的液滴中溶解的。该方程式可以在以下大规模模拟中用作子类模型。在非常本地的海洋尺度上，液滴不是单独处理的，而是作为体积分数和数量密度的处理。因此，这种模拟设法阐明了深海注入点附近的液滴的行为。此外，二氧化碳溶解到海水中的化学过程及其对单个生物体的生物影响很容易解决。结果说，pH值经历了每种生物体几乎不会导致二氧化碳量和注射周期的死亡率，我们在模拟中合理地设定了死亡率。我们还进行了室友大小的李子行为实验，并将结果与​​数值模拟的结果进行了很好的比较。较少的

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。