Geodesics along the group of volume preserving diffeomorphisms are solutions to Euler equations of inviscid incompressible fluids, as observed by Arnold [4]. On the other hand, the projection onto volume preserving maps amounts to an optimal transport problem, as follows from the generalized polar decomposition of Brenier [14].
We present, in the first section, the framework of semi-discrete optimal transport, initially developed for the study of generalized solutions to optimal transport [1] and now regarded as an efficient approach to computational optimal transport. In a second and largely independent section, we present numerical approaches for Euler equations seen as a boundary value problem [16, 7, 33]: knowing the initial and final positions of some fluid particles, reconstruct intermediate fluid states. Depending on the data, we either recover a classical solution to Euler equations, or a generalized flow [15] for which the fluid particles motion is non-deterministic, as predicted by [39].
@article{JEDP_2015____A7_0, author = {Mirebeau, Jean-Marie}, title = {Numerical resolution of Euler equations through semi-discrete optimal transport}, journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, year = {2015}, pages = {1-16}, doi = {10.5802/jedp.636}, language = {en}, url = {http://dml.mathdoc.fr/item/JEDP_2015____A7_0} }
Mirebeau, Jean-Marie. Numerical resolution of Euler equations through semi-discrete optimal transport. Journées équations aux dérivées partielles, (2015), pp. 1-16. doi : 10.5802/jedp.636. http://gdmltest.u-ga.fr/item/JEDP_2015____A7_0/
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