船舶CFD不确定度分析方法述评(英文)

An Overview of Verification and Validation Methodology for CFD Simulation of Ship Hydrodynamics

船舶CFD技术已越来越显示其"数值水池"的巨大潜力和广阔前景;CFD的不确定度分析也就成为"数值水池"实用化的技术瓶颈之一。以"量值溯源"为基础的测量不确定分析方法体系(如ISO-GUM)并不适用于数值模拟。自AIAA于1998年发布"CFD不确定度分析导则"以来,关于CFD不确定度分析的技术术语和定义已逐步取得统一。2009年ASME发布了"CFD不确定度分析标准"并成为美国标准,必将有力地推动CFD不确定度分析的广泛应用和方法统一。文中首先对AIAA和ASME方法进行了综述,重点评述了"数值计算不确定度"(numerical uncertainty)的评定方法;其后,对ITTC现有规程(2008年修订)以及最新进展进行了简要的总结。文中还对如何将CFD不确定分析与船舶CFD实际应用相结合的问题给出了初步建议。

There was a consensus for the terminology and methodology for verification and validation in Computational Fluid Dynamics（VV in CFD）,however,the detailed procedure for verification is still a matter of an ongoing discussion and CFD users community are more or less confused with application of those recommended procedures.In this paper,a review of the AIAA（1998） Guidelines[4] and ASME（2009） Standard[6] for VV in CFD is presented,focusing on definitions and equations for the quantitative assessment of numerical uncertainty by solution verification.As comparison,the ITTC procedures for VV in CFD and the latest practices in ITTC community are also briefly summarized.Some proposals for CFD application in practical prediction of ship hydrodynamics are put forward,aiming at developing the best practices for a specific application.