阻力和流场的CFD不确定度分析探讨

Uncertainty analysis in CFD for resistance and flow field

为了解并研究CFD中不确定度分析的整个过程和细节,依照ITTC推荐规程,针对SUBOFF潜艇阻力和流场的数值模拟结果,进行了CFD中的不确定度分析和探讨。数值计算中采用了5套网格,网格加细比rG=2～(1/2)。在此基础上,进行了验证分析,评估了数值误差和数值不确定度,验证过程全部完成。而后进行了确认分析,评估了对比误差和确认不确定度,确认过程全部完成。

In order to comprehend and study the whole process and details of uncertainty in CFD, according to the ITTC-Recommended Procedures, uncertainty analysis in CFD is carried out with the numerical results of the resistance and flow filed of SUBOFF. Five grids are used in the numerical simulation and the grid refinement ratio rC=√2 Base on these results, the verification analysis is performed. Numerical error and numerical uncertainty are evaluated, so the verification process is conducted completely. Subsequently, the validation analysis is performed. Comparison error and validation uncertainty are evaluated, so the validation process is conducted completely.