国家数值风洞(NNW)验证与确认系统关键技术研究进展

Advances in the key technologies of verification and validation system of National Numerical Windtunnel project

系统、科学、严格的验证与确认是计算流体力学软件可信度评价和保证的必经途径。验证与确认系统是在软件的全生命周期,包括开发、测试、应用和更新阶段,从科学计算的角度为软件质量提供全方位的保证。本文从方法、数据和工具三个方面详细介绍了NNW工程验证与确认系统的关键技术研究进展。在方法方面,从误差和不确定度来源的数学特征出发,发展了相应的估计和量化手段,初步构建了可信度评价体系,这为如何进行验证与确认、可信度评价提供了技术基础。在数据方面,从流动现象层次分析出发,建立了多维度的从简单到复杂物理现象耦合的标模算例体系,为验证与确认活动提供了可靠的基准数据。在实验工具方面,数据库和可信度平台开发为方便实施验证与确认提供了高度自动化工具。文章最后对下一步工作进行了展望。

Verification and validation(V&V)activities which are systematic,scientific and rigorous,are essential approaches for credibility assessment and assurance of computational fluid dynamics software.V&V are able to provide guarantee for software quality assurance and improvement from the perspective of scientific computing during the full life-cycles of software,including development,testing,application and updating stages.The advances in the key technologies of V&V,including methodology,data and tools,are introduced in this paper.Error estimation and uncertainty quantification,from their respective mathematical characteristics,together with credibility assessment system,provide technical foundation to perform verification,validation and credibility assessment.The construction of multi-dimensional calibration model system,which starts from level analysis of flow phenomena and ranges from simple flows to complex flows,and standard case collection provide reliable benchmark data for V&V.The development of database and credibility assessment platform provides highly automated tools for performing V&V.The paper prospects further work at the end.