Improved Computations for Convection Dominated Turbulent Flow Problems Using the Fractional Step Method

使用分数步法改进对流主导的湍流问题的计算

• 批准号: 8718436
• 负责人: Joannes Westerink
• 金额: $ 6万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-09-01 至 1990-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8718436&HistoricalAwards=false
• 关键词: Improved; Computations; Convection; Dominated; Turbulent

The computation of transport problems are especially troublesome when the solution field contains steep gradients such as those of temperature or concentration. When solving such problems associated with convection either wiggly or unstable, solutions generally result when the standard finite difference of finite element methods are applied. There are schemes that add artificial or numerical diffusion to the computation to dampen numerical instabilities. However, such non-physical diffusion often serves to confuse the real damping that exists in the problem. The objective of this Engineering Initiation project is to expand on the recent developments in higher order schemes which are non-diffusive. In particular, the fractional step method will be used to treat a class of convective dominated problems. The benefits of this procedure includes accuracy and a relative increase in computational scheme will be possible. The institutional support is adequate and the P.I. has extensive experience on the NSF-JVNC supercomputer. I strongly recommend support.

运输问题的计算特别麻烦， 解场包含陡峭梯度，例如温度梯度 或者集中注意力 在解决这类与对流有关的问题时 无论是波动的还是不稳定的，当标准品 采用有限差分有限元法。 有 将人工或数值扩散添加到计算中的方案， 减少数值不稳定性。 然而，这种非物理扩散 经常用于混淆问题中存在的真实的阻尼。 本工程启动项目的目标是扩大 非扩散高阶格式的最新发展。 在 特别地，分数步方法将用于处理一类 对流为主的问题。 此程序的好处包括 准确性和计算方案的相对增加将是 可能 机构支持是充分的，P.I.拥有丰富 NSF-JVNC超级计算机 我强烈建议支持。