4–5 Jun 2015
IASB-BIRA (RMI Royal Meteorologic Institute meeting room)
UTC timezone

Implementing mesh-free methods in the simulation code SWIFT

5 Jun 2015, 14:50
25m
RMI meeting room (IASB-BIRA (RMI Royal Meteorologic Institute meeting room))

RMI meeting room

IASB-BIRA (RMI Royal Meteorologic Institute meeting room)

3 av. circulaire B-1180 Brussels
Talk Session 5

Speaker

Mr Bert Vandenbroucke (Universiteit Gent)

Description

Mesh-free hydrodynamical methods as introduced by *Hopkins (2014)* provide a promising symbiosis of particle based and mesh based Lagrangian hydrodynamical methods. They couple the accuracy of finite volume methods to the computational strengths of smoothed particle hydrodynamics (SPH). To this end, the fluid is discretized as a set of particles, as in SPH. Volumes for the particles are calculated using a kernel-weighted loop over neighbouring particles and are used to convert conserved particle quantities to primitive quantities, as in a finite volume approach. These primitive quantities then serve as an input for a set of Riemann problems at the abstract interfaces between particles, the solution of which ultimately allows us to calculate fluxes of conserved quantities that are exchanged between particles. As in all SPH-like schemes, mesh-free methods spend a large fraction of their computational time in loops over neighbouring particles. Hopkins' GIZMO is based on Gadget-3, which is known to scale poorly above 512 cores, due to bad scaling of the tree algorithm employed for the neighbour loops. The simulation code SWIFT developed at Durham University scales a lot better by replacing the tree algorithm by a hierarchical cell structure, which is comparable to an adaptive mesh refinement (AMR) grid. SWIFT and GIZMO therefore seem to be an ideal match. In my talk, I want to discuss the implementation of a mesh-free method in the simulation code SWIFT. I will explain the method in some more detail and report on some of the first results obtained using the method. I will compare these results to results obtained using standard SPH and to results obtained using the moving mesh code Shadowfax, both on accuracy and efficiency.

Primary author

Mr Bert Vandenbroucke (Universiteit Gent)

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