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Minimization of undesired wave reflections at the boundaries of the computational domain in flow simulations with free surface based on the Navier-Stokes equations

基于纳维-斯托克斯方程的自由表面流动模拟中计算域边界处的不良波反射最小化

基本信息

批准号：
321791315
负责人：
Professor Dr.-Ing. Moustafa Abdel-Maksoud
金额：
--
依托单位：
Institut für Fluiddynamik und Schiffstheorie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/321791315?language=en
关键词：
Minimization undesired wave reflections boundaries

项目摘要

The ability to accurately simulate the propagation of free surface waves and the corresponding fluid-structure-interactions are important topics in computational fluid mechanics, especially in regards to maritime industry and research. The main difficulty in applying RANSE-based simulation techniques is minimizing undesired wave reflections at the boundaries of the computational domain, since such reflections can lead to considerable uncertainties in the simulation results. By introducing source terms into the governing equations within a zone in the vicinity of the domain boundary, outgoing waves can be damped. Another way to reduce wave reflections is to couple the RANSE solver with a second flow solver. In this case, the RANSE solution can be blended to the solution of the other flow solver. Within the current state of knowledge, selecting the optimum source terms is a problem which remains insufficiently investigated. Hence, the main aim of this research project is to develop adaptive approaches for minimizing undesired wave reflections. In this case, the source terms will be adjusted with respect to incoming waves so that they are set to their optimum values at all times during the simulation. The developed approaches will minimize undesired wave reflections and enable prediction of the corresponding uncertainties before starting the simulation. After sufficient validation for 2D and 3D simplified cases, the applicability of the developed methods will be demonstrated for typical three-dimensional maritime flow simulation problems.

准确模拟自由表面波的传播和相应的流固相互作用的能力是计算流体力学中的重要课题，特别是在海事工业和研究方面。应用基于ranse的模拟技术的主要困难是最大限度地减少计算域边界的不希望的波反射，因为这种反射会导致模拟结果中的相当大的不确定性。通过在区域边界附近的区域内将源项引入控制方程，可以对出射波进行阻尼。另一种减少波反射的方法是将RANSE求解器与第二个流求解器耦合。在这种情况下，RANSE溶液可以与其他流动求解器的溶液混合。在现有的知识范围内，选择最优源项是一个尚未得到充分研究的问题。因此，本研究项目的主要目的是开发自适应方法，以尽量减少不希望的波反射。在这种情况下，源项将相对于传入波进行调整，以便在模拟过程中始终设置为最佳值。所开发的方法将最小化不希望的波反射，并能够在开始模拟之前预测相应的不确定性。在对二维和三维简化案例进行充分验证后，将证明所开发方法对典型三维海流模拟问题的适用性。