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We present a new approach to efficiently simulate electrolytes confinedbetween infinite charged walls using a 3d Ewald summation method. The optimalperformance is achieved by separating the electrostatic potential produced bythe charged walls from the electrostatic potential of electrolyte. The electricfield produced by 3d periodic images of the plates is constant, with the fieldproduced by the transverse images of the charged plates canceling out. We showthat under suitable renormalization, the non-neutral electrolyte confinedbetween charged plates can be simulated using 3d Ewald summation with acorrection that accounts for the conditional convergence of the resultinglattice sum. The new algorithm is at least an order of magnitude more rapidthan the usual simulation methods for the slab geometry and can be further spedup by adopting Particle-Particle Particle-Mesh (P 3 M ) approach.

Simulations of Coulomb systems with slab geometry using an efficient 3d Ewald summation method