SBIR Phase I: An Automated Adaptive Cartesian/Prism Grid Flow Simulation Methodology for Arbitrary Moving Boundary Problems

SBIR 第一阶段：任意移动边界问题的自动自适应笛卡尔/棱柱网格流仿真方法

• 批准号: 9660943
• 负责人: Z.J. Wang
• 金额: $ 7.5万
• 依托单位: CFD RESEARCH CORPORATION
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9660943&HistoricalAwards=false
• 关键词: SBIR; Phase; Automated; Adaptive; Cartesian

*** 9660943 Wang This Small Business Innovation Research Phase I project will develop a new scientific-computation methodology for arbitrary moving-boundary problems. In the immediate vicinity of boundaries adaptive prism grids will be used in order to exploit their ability to provide surface-conformal spatial discretization, enabling accurate and efficient computational resolution of viscous and thermal boundary layers. These grids will move and deform with the boundaries around which they are built. Away from boundaries, a stationary, adaptive Octree-based Cartesian grid will be used to exploit its efficiency and flexibility. The Cartesian grid will be overlapped with the moving and deforming prism grids. Both types of grid will be adapted according to the physics of the unsteady flow field. For the coupling between the two grids, both conservative (expensive) and non-conservative (efficient) interfacing algorithms will be developed and demonstrated in the Phase I research. A second order flow solver based on a recently-developed all-speed flux splitting method capable of handing dynamic grids will be implemented, enabling highly-resolved solution of both incompressible and compressible flows. The unsteady flow fields will be displayed as they develop, through an on-line visualization capability. The overall system seamlessly integrates grid generation, flow solver, grid adaptation and post-processing to obtain maximum solution accuracy, efficiency and user friendliness. In Phase I, the methodology will be implemented and demonstrated in two dimensions. Extension to three-dimensions will be made in Phase II. The accurate modeling of flow phenomena involving moving boundaries is the key to a understanding, to improvement of performance, and to the cost-effective, rapid investigation of new designs. If successfully demonstrated in Phase I, the methodology will provide a reliable, computationally-efficient design and analysis tool that will have an immediate and far-reaching scient ific and economic impact in many distinct industries such as materials processing, aerospace engineering, and bioengineering. ***

*** 9660943 WANG这个小型企业创新研究阶段I项目将开发一种新的科学计算方法，用于任意移动边界问题。 在边界的直接附近，自适应棱镜网格将用于利用其提供表面符合表面形式的空间离散化的能力，从而可以准确有效地计算粘性和热边界层的计算分辨率。 这些网格将随着它们围绕的边界而移动并变形。远离边界，将使用基于自适应的OCTREE的固定，自适应的笛卡尔网格来利用其效率和灵活性。笛卡尔网格将与移动和变形的棱镜网格重叠。两种类型的网格将根据不稳定流场的物理学进行调整。对于两个网格之间的耦合，将在I期研究中开发和证明保守（昂贵）和非保守（高效）接口算法。将实现基于最近开发的全速通量分裂方法的二阶流求解器，将实现动态网格，从而实现了不可压缩和可压缩流的高度分辨解决方案。通过在线可视化功能将显示不稳定的流场随着它们的发展而显示。整个系统无缝地集成了网格生成，流量求解器，网格适应和后处理，以获得最大的解决方案准确性，效率和用户友好性。 在第一阶段，该方法将在二维中实施和证明。 在第二阶段将进行三维的扩展。 涉及移动边界的流动现象的准确建模是理解，改善性能以及对新设计的成本效益，快速研究的关键。 如果在第一阶段成功证明，该方法将提供可靠的，计算高效的设计和分析工具，该工具将在许多不同的行业（例如材料加工，航空航天工程和生物工程）中具有直接且深远的科学易学和经济影响。 ***