What is it about?
Without any turbulent or transition model, Direct numerical simulation is hard to be performed because it requires abnormally huge number of grid size. From this research, however, it is shown that the Direct numerical simulation can be performed even with a very coarse grid and gives a high resolution in a general curvilinear grid.
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Why is it important?
The current Direct numerical simulation result is compared with the famous experiment data, and it shows a promising validation result. From the coordinate transformation, now the Direct numerical simulation can be applied any other arbitrary geometry.
Perspectives
The computational fluid dynamics was started from potential theory, and people can consider the viscosity effect with the CFD nowadays. Thus, there is a huge gap between Potential code and CFD. Now, there is another gap between CFD and DNS. Most CFD needs a model like a RANS and LES, and these models are hard to be independent from the isotropic turbulent assumption like the Boussinesq assumption. However, turbulent is not isotropic. It is anisotropic. Therefore, the wrong assumption in the field of fluid mechanics will be relegated to the pages of history, and this new approaches will become mainstream.
Sungtek Park
The University of Iowa
Read the Original
This page is a summary of: Direct numerical simulation for backward-facing step flow with turbulence anisotropy analysis in a fully staggered curvilinear grid, Physics of Fluids, September 2024, American Institute of Physics,
DOI: 10.1063/5.0223190.
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