Homogeneous Computational Performance of the Structured/Unstructured Hybrid Grid in NNW-PHengLEI
The structured and unstructured grids of traditional CFD are complementary in terms of complex grid generation,near-wall grid quality,and far-field grid density.If they can be combined as"structured/unstructured hybrid grid",the advantages of different grid types can be fully utilized.Based on the arbitrary grid frameworks for"homogeneous hybrid computation"of NNW-PHengLEI software,the structured,unstructured and structured/unstructured hybrid grids of RAE2822 airfoil and ONERA M6 wing are constructed with daily generation strategy and similar grid size.The computational performance of different grid types are compared and analyzed.For weak shock-induced separated flow,the preliminary results show that structured/unstructured hybrid grid can get better agreement with the experimental data,and the convergence and computational efficiency are better than those of the structured and unstructured grids.However,there is a discontinuity in the variables at the interface between the structured-unstructured domains,and the number of layers of the structured grid in the near-wall region will obviously affect the computational results.Only by ensuring sufficient coverage of the structured grid and better grid transition,the solution accuracy of the near-wall region can be guaranteed.In addition,according to the computational experience,the generation strategy for structured/unstructured hybrid grid and the application guidelines using NNW-PHengLEI have been proposed,which can provide reference for engineering applications.
NNW-PHengLEIstructured/unstructured hybrid gridstandard model verificationcomputational accuracy and efficiencyconvergenceengineering application guidelines
NETL
NSTL
万方数据
维普
