Papers › High-order thread-safe lattice Boltzmann model for HPC turbulent flow simulations
High-order thread-safe lattice Boltzmann model for HPC turbulent flow simulations
Andrea Montessori, Michele La Rocca, Giorgio Amati, Marco Lauricella, Adriano Tiribocchi, Sauro Succi
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We present a highly-optimized thread-safe lattice Boltzmann model in which the non-equilibrium part of the distribution function is locally reconstructed via recursivity of Hermite polynomials. Such a procedure allows the explicit incorporation of non-equilibrium moments of the distribution up to the order supported by the lattice. Thus, the proposed approach increases accuracy and stability at low viscosities without compromising performances and amenability to parallelization with respect to standard lattice Boltzmann models. The high-order thread-safe LB is tested on two types of turbulent flows, namely the turbulent channel flow at Re_τ=180 and the axisymmetric turbulent jet at Re = 7000, it delivers results in excellent agreement with reference data (both DNS, theory, and experiments) and a) achieves peak performances (∼5 TeraFlop/s and an arithmetic intensity of ∼7 FLOP/byte on single GPU) by significantly reducing the memory footprint, b) retains the algorithmic simplicity of standard lattice Boltzmann computing and c) allows to perform stable simulations at vanishingly low viscosities. Our findings open attractive prospects for high-performance simulations of realistic turbulent flows on GPU-based architectures. Such expectations are confirmed by the excellent agreement among lattice Boltzmann, experimental, and DNS reference data.
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