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....I do not want to torture you with too many details. I’ll give you one example. [artificial viscosity]
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The comments by Tomer (Tom) Avraham suggest the Navier-Stokes equations still need the insight that Steinmetz brought to Maxwell's equations.
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Open-source is typically closer to the measurement data
....we have done many benchmarks to compare codes each other or with measurements. The results completely confirm this. For example, in every turbomachinery benchmark, we have seen, open-source code gives a bit higher efficiency than commercial code. Open-source is typically closer to the measurement data.
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This was also the conclusion of the national intelligence agencies. Open sources are more fruitful than covert sources.