GPU-Accelerated Numerical Simulations of the Knudsen Gas on Time-Dependent Domains

Florian De Vuyst, Francesco Salvarani
Centre de Mathematiques et de Leurs Applications (CMLA), CNRS : UMR8536 – Ecole normale superieure de Cachan – ENS Cachan
hal-00687566, version 1, 2012


   title={GPU-accelerated numerical simulations of the Knudsen gas on time-dependent domains},

   author={De Vuyst, F. and Salvarani, F. and others},



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We consider the long-time behaviour of a free-molecular gas in a time-dependent vessel with absorbing boundary, in any space dimension. We first show, at the theoretical level, that the convergence towards equilibrium heavily depends on the initial data and on the time evolution law of the vessel. Subsequently, we describe a numerical strategy to simulate the problem, based on a particle method implemented on GPGPU. We observe that the parallelization procedure on GPGPU allows a marked improvement of the performances when compared with the standard approach on CPU.
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