Dust explosion is a constant threat to industries which deal with combustible powders such as pellets producers, food industry, metal industry and so on. The present work aims atdeveloping a numerical tool by (i) implementing a premixed turbulent combustion model into an open-source CFD software OpenFOAM, (ii) verifying the implementation using analytical solutions,and (iii) validating the approach in unsteady 3D RANS simulations of cornflour dust explosions investigated experimentally using the Leeds fan-stirred bomb [1-3]. A detailed description of thiswork is reported in a recent publication [4].