Numerical acoustic and flow simulations for clean energy systems

能源对我们的生活水平和经济至关重要，然而，我们的目标不仅仅是生产能源，而是生产“清洁”能源。 Paraschivoiu教授的研究目标是开发用于提高新清洁能源接受度的模拟工具。 更具体地说，将使用流动的计算模拟来促进高压储氢的安全性和信任，并将开发声学模拟来研究风力涡轮机的噪音污染。 氢能源对汽车行业越来越有吸引力，但氢的储存及其安全性问题仍然存在。在短期内，高压储存器似乎是储氢的第一个解决方案。为了使公众接受，安全是主要关注的问题，需要建立最大限度地减少风险的规范和标准，特别是如果有氢从储存器释放的爆炸风险。为此，需要模拟许多场景，计算流体动力学（CFD）是进行此调查的首选工具。CFD是一种数值技术，用于模拟复杂几何形状上的流动。显然，解决方案的准确性是至关重要的，现有的商业软件包无法解决这个问题。Paraschivoiu教授正在为此应用开发新的CFD工具。 该提案旨在研究氢射流以音速离开储层时以及形成的氢云。 风力涡轮机产生的噪音相对较低，但公众对这种刺激的反对情绪正在增长。为了减少噪声污染，必须研究噪声的产生和传播。一个显着的研究工作致力于噪声的产生，但很少的工作解决噪声传播。Paraschivoiu教授拥有声学模拟方面的经验，并建议开发一种模拟工具来计算风力涡轮机产生的噪声的声学传播。该振动声学模拟代码将包括一些用于空间近似和求解器加速的最新技术，这些技术也可以用于更一般的科学计算领域。

Energy is critical to our standard of living and our economy, nevertheless, the goal is not only to produce energy but to produce "clean" energy.   The proposed objective of Prof. Paraschivoiu's research is to develop simulations tools that are used to improve the acceptance of new clean energy sources.  To be more specific, computational simulations of flow will be used to promote safety and trust in high pressure hydrogen storage and acoustic simulations will be developed to study the noise pollution from wind turbines.    The Hydrogen energy is increasingly attractive for the automotive industry but storing hydrogen and issues related to its safety remain. In the short term, high pressure reservoirs seem to be the first solution for hydrogen storage. For public acceptance, safety is the main concern and requires establishing codes and standards that minimize risk, in particular the risk of explosion if there is hydrogen release from the reservoir. To this end many scenarios need to be simulated and computational fluid dynamics (CFD) is the preferred tool to do this investigation. CFD is a numerical technique to simulate flows on complex geometries. Obviously, the solution accuracy is critical and is not available with the existing commercial packages for this problem. Prof. Paraschivoiu is developing new CFD tools for this application.  This proposal aims at studying the hydrogen jet as it exits the reservoir at sonic speeds as well as the hydrogen cloud that is formed.    Wind turbines produce a relative low level of noise but public opposition to this irritation is growing. To decrease the noise pollution, noise production as well as noise propagation must be studied. A significant research effort is dedicated to the noise production but very little work addresses the noise propagation. Prof. Paraschivoiu has experience on acoustic simulations and is proposing to develop a simulation tool to calculate the acoustic propagation of noise generated by wind turbines. This vibro-acoustic simulation code will include some of the state of the art technique for spatial approximations and solver acceleration that can also be used in the more general area of scientific computing.