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The Sub-grid scale gradient model: a numerical technique for accurate MHD Large Eddy simulations (Contributed speaker)

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DY2W01 - Dynamos in planets and stars - similarities and differences

In many astrophysical MHD contexts, the computational feasibility of covering all the scales of interest (from the dominion size down to the dissipative scales) is and will be many orders of magnitude away from what would be ideally needed. Large eddy simulations are used to partially compensate such lack of numerical resolution, introducing sub-grid-scale models. I present our compressible MHD extension of the so-called gradient model, that can be implemented for any problem, equation of state, in relativistic and non-relativistic cases. I show the breakthrough results of our main application so far, the magnetic amplification during mergers, and we can all discuss possible direct applications to planetary dynamo codes.

This talk is part of the Isaac Newton Institute Seminar Series series.

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Faculty of Education, 184 Hills Road, Cambridge CB2 8PQ Tagliaferri Lecture U202, Department of Chemistry, Lensfield Road CB2 1EW

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