Validation of a moderate Reynolds number channel in Neko

Abstract: Neko is a portable framework for high-order spectral element flow simulations[1]. Originally from Nek5000, Neko not only inherited its numerical stability and well-performance, but also added the benefits of dynamic memory and support for many current accelerator backends. As a newly developed code, Neko requires comprehensive validation, and certain functions are yet to be implemented. To this end, the present work performed simulations in Nek5000 and Neko and compared the results. A straight channel with friction Reynolds number Reτ = 590 is used as the test case. Some functions are implemented in the current post-processing framework, and the statistics from different solvers are compared. It is shown that the results from tested solvers are similar, although two methods for discretization, i.e., PnPn−2 and PnPn, are used. Besides, a convergence analysis and a resolution study are done to further compare and validate the code.