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Multi-scale problems, high performance computing and hybrid numerical methods. (English) Zbl 1326.76046

Wakayama, Masato (ed.) et al., The impact of applications on mathematics. Proceedings of the Forum of Mathematics for Industry, “Math-for-Industry 2013”, Fukuoka, Japan, November 4–8, 2013. Tokyo: Springer (ISBN 978-4-431-54906-2/hbk; 978-4-431-54907-9/ebook). Mathematics for Industry 1, 245-255 (2014).
Summary: The turbulent transport of a passive scalar is an important and challenging problem in many applications in fluid mechanics. It involves different range of scales in the fluid and in the scalar and requires important computational resources. In this work we show how hybrid numerical methods, combining Eulerian and Lagrangian schemes, are natural tools to address this multi-scale problem. One in particular shows that in homogeneous turbulence experiments at various Schmidt numbers these methods allow to recover the theoretical predictions of universal scaling at a minimal cost. We also outline how hybrid methods can take advantage of heterogeneous platforms combining CPU and GPU processors.
For the entire collection see [Zbl 1300.00038].

MSC:

76F65 Direct numerical and large eddy simulation of turbulence
76M28 Particle methods and lattice-gas methods

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