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arXiv · 2411.11416

Fake it till you make it: using artificial turbulence to achieve swift converged turbulence statistics in a pressure-driven channel flow

Akshay Patil·Clara García-Sánchez
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Abstract

In this study, we introduced a simple yet innovative method to trigger turbulence in a channel flow to achieve statistically stationary flow conditions. We compare this new method based on synthetically generated three-dimensional turbulence with two other well-established methods, namely, linear profile superposed with random noise and descending counter-rotating vortices and log-law profile superposed with random noise and descending counter-rotating vortices. We found that synthetically generated three-dimensional turbulence provides a computationally cheap and effective way to reduce simulation spin-up to achieve statistically stationary flow conditions when a precursor turbulent initial condition is not available. At a one-time cost of less than 1 CPU hour to generate the synthetic turbulent initial condition, the flow becomes statistically stationary within 3 eddy turnovers for all the parameters of interest in wall-bounded pressure-driven channel flow simulations when compared to other alternatives that can take more than 10 eddy turnovers resulting in substantial savings in the computational cost.

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Akshay Patil, Clara García-Sánchez. 2024-11-18. Fake it till you make it: using artificial turbulence to achieve swift converged turbulence statistics in a pressure-driven channel flow. https://arxiv.org/abs/2411.11416

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