Terascale Direct Numerical Simulations of Turbulence Generated by Fractal Grids

分形网格产生的湍流的万亿级直接数值模拟

基本信息

批准号：
EP/F051468/1
负责人：
John Vassilicos
金额：
$ 2.68万
依托单位：
Imperial College London
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF051468%2F1
关键词：
Terascale Direct Numerical Simulations Turbulence

项目摘要

Turbulence is of enormous importance in the enviroment, meteorologyand oceanography and also in many industries where fluid flow isinvolved such as in the chemical, mixing, car, aerospace and navalindustries. Just as an example, the cost of pumping oil throughpipelines is directly proportional to the frictional losses whichturbulence causes. As another example, worldwide ocean shippingconsumes about 2.1 billion barrels of oil per year. Understandingturbulence can lead to flow control schemes for reducing skin frictiondrag. At 75 US dollars per barrel (nowadays a very conservativeestimate), 10% such reduction would save 15 billion US dollars peryear, not to mention the consequent impressive reductions ofpollutants in ship emissions. Similar projections can be made forairline industries which consume about 2 billion barrels of jet fuelper year.Over the past 60 years or so the efforts in turbulence have beenmostly in ad hoc modelling of specific flows and the progress has beenlimited. An understanding of turbulence dynamics is needed, and forthis a particular experiment is needed where these turbulence dynamicscan be set out of joint so as to give us clues for understanding them.This is what has been achieved recently at Imperial College Londonwhere the first ever experiments of turbulence generated by fractalgrids in wind tunnels have been conducted with impressive results. Itis now necessary to develop computer simulations of these flows. Theseare very large simulations, in prticular because of the multiscalenature of the fractal turbulence generators, and require state-of-theart top-end parralel computing. The challenge is computational.Meeting this challenge presents us with an unprecedented opportunityto understand turbulence and how to manipulate it.

在环境，气象学和海洋学以及许多行业中，湍流在化学，混合，汽车，航空航天和海军工业中都非常重要。例如，泵送石油生产的成本与扰动造成的摩擦损失成正比。作为另一个例子，全球海洋运输每年约21亿桶石油。了解扰动可能会导致流动控制方案，以减少皮肤摩擦。以每桶75美元的价格（如今非常保守），这种减少的10％将节省150亿美元的peryear，更不用说船舶排放中造成的粉碎者的令人印象深刻的减少。可以制定类似的预测福拉林行业，该行业消耗了约20亿桶的喷气燃油一年。在过去60年左右的时间里，湍流的努力主要是在特定流动的临时建模中，而且进展已被限制。需要了解湍流动力学，并且需要进行特定的实验，其中这些湍流动力学是由关节设置的，以便为我们理解它们的线索。这是伦敦帝国学院（Imperial College London）最近在伦敦帝国学院（Imperial College College Where）实现的最早的湍流实验，这是风隧道中的Fractalgrids产生的，这是令人印象深刻的结果。现在有必要开发对这些流量的计算机模拟。由于分形湍流发生器的多牙机，并且需要最先进的高端parral parral parral计算，因此在较大的模拟中非常大。挑战是计算。这项挑战为我们提供了一个前所未有的机会来了解湍流以及如何操纵它。