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Significant improvements in the computational performance of thelattice-Boltzmann (LB) model, coded in FORTRAN90, were achieved throughapplication of enhancement techniques. Applied techniques include optimizationof array memory layouts, data structure simplification, random numbergeneration outside the simulation thread(s), code parallelization via OpenMP,and intra- and inter-timestep task pipelining. Effectiveness of theseoptimization techniques was measured on three benchmark problems: (i) transientflow of multiple particles in a Newtonian fluid in a heterogeneous fracturedporous domain, (ii) thermal fluctuation of the fluid at the sub-micron scaleand the resultant Brownian motion of a particle, and (iii) non-Newtonian fluidflow in a smooth-walled channel. Application of the aforementioned optimizationtechniques resulted in an average 21 performance improvement, which couldsignificantly enhance practical uses of the LB models in diverse applications,focusing on the fate and transport of nano-size or micron-size particles innon-Newtonian fluids.

computer physics communications

Enhanced computational performance of the lattice Boltzmann model for  simulating micron- and submicron-size particle flows and non-Newtonian fluid  flows