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Conditioning of Data-Driven Models

Updated: Apr 28, 2022

Journal of Fluid Mechanics 869, 553-586, 2019 J.-L. Wu, H. Xiao, R. Sun, and Q. Wang




A small error in Reynolds stress can lead to large errors in the mean velocity when solving the RANS equations because of poor model conditioning. We derive a local condition number as an indicator of conditioning and demonstrate that this number explains the error propagation from Reynolds stress to mean velocity with examples.

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