Applicant
Prof. Dr. Philipp Schlatter
Institute of Fluid Mechanics (LSTM)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Project Overview
SIMSON is a massively parallel pseudo-spectral solver for incompressible Navier–Stokes
equations in Cartesian geometries (Chevalier et al. 2007), which has been extensively used by
us and other groups for several highly-cited scientific studies of transition and turbulence
(including the benchmark boundary layer simulations Schlatter & Örlü 2010, Schlatter & Ölrü
2012, Eitel-Amor, Örlü and Schlatter 2014, and Pozuelo et al. 2022, with accumulated >3000
citations). Since originally the majority of the analysis was being done with single and two-point
statistics collected during runtime, there was no need for high performance I/O of the entire
three-dimensional (3D) flowfield. Recently, for more advanced data-driven analysis, I/O of 3D
snapshots has become a major bottleneck. The goal of this proposal is to address this issue by
implementing an efficient and versatile I/O using state-of-the-art parallel HDF5, thus enabling
continued usage of the code for more modern type of analysis that usually requires output of
many fields. Given the long history of SIMSON, its constant adaptation and the integration of
many modern modules with the code, the project will include adding HDF5 I/O support to all
related tools, thus facilitating a smooth transition. This would also simplify the use of SIMSON in
teaching, e.g., for the Computational Fluid Dynamics (CFD) and Turbulence courses at FAU.
References
Chevalier, M., Schlatter P., Lundbladh A., Henningson D.S., SIMSON: A Pseudo-Spectral Solver for incompressible Boundary Layer Flows, Technical report, KTH Mechanics, Stockholm, Sweden, 2007. Available at: https://www.mech.kth.se/~mattias/simson-user-guide-v4.0.pdf
Eitel-Amor G., Örlü R. Schlatter P., Simulation and validation of a spatially evolving turbulent boundary layer up to Re ≈ 8300, Int. J. Heat Fluid Flow, 47, 57–69, 2014.
Karp, M., Stanly, R., Song, H., Mukha, T., Galimberti, L., Toosi, S., Dalcin, L., Rezaeiravesh, S., Münsch, M., Jansson, N., Markidis, S., Parsani, M., Bose, S. T., Lele, S. K., Schlatter, P., Sensitivity of numerical simulations of turbulence to lower floating-point precision, CTR Summer Program 2024, available at: https://web.stanford.edu/group/ctr/ctrsp24/v05_KARP.pdf
Li Q., Schlatter P., Henningson D., Spectral Simulations of Wall-bounded Flows on Massively-parallel Computers, 2008, Available at: https://www.kth.se/social/files/5b2654bb56be5b6d7e5ac334/li_schlatter_henningson_2008.pdf
Pozuelo R., Li Q., Schlatter P., Vinuesa R., An adverse-pressure-gradient turbulent boundary layer with nearly constant β ≈ 1. 4 up to Re ≈ 8700, J. Fluid. Mech., 939, A34, 2022.
Schlatter P., Örlü R. Assessment of direct numerical simulation data of turbulent boundary layers, J. Fluid. Mech., 659, 116–126, 2010.
Schlatter P., Örlü R. Turbulent boundary layers at moderate Reynolds numbers: inflow length and tripping effects, J. Fluid. Mech., 710, 5–34. 2012.