CFD lecture 22 - Computational Fluid Dynamics Lecture 22...

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Computational Fluid Dynamics Lecture 22 Subgrid Scale Modeling The two most significant difficulties in doing CFD are: 1. What to do with unresolved large scale motions. 2. How to treat unresolved small scale motions. Typical grid resolutions possible on large computers in 2000 depend on the time duration of the calculation, but for typical “mid-term” calculations, say 10 eddy turnover times, or 10 hours or 10 days of simulation. Grid resolutions of 256 256 256 × × are possible or common. 3 256 16.8 = million grid points This would allow simulation of a computational domain of ~50 km 50 km 5 km × × with 100 m grid resolution -or- ~ with 1 mm grid resolution. 25 cm 25 cm 25 cm ×× In the large scale problem, there are a lot of sub grid scale processes. The entire surface mixer layer is typically 100 m thick and strongly influences the transfer of momentum and heat between the ocean and atmosphere. Large scale ocean models, such as for the North Atlantic, cover domains of ~10,000 km 10,000 km 10 km
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CFD lecture 22 - Computational Fluid Dynamics Lecture 22...

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