Dust explosion is a constant threat to industries which deal with combustible powders e.g. woodworking, metal processing, food and feed, pharmaceuticals and additive industries. Physics-based, well-verified and well-validated models and numerically efficient codes are important tools for designing dust explosion protection systems where the current standards are not applicable. This work aims at (i) presenting a physics-based dust explosion model based on an open source code OpenFOAM, (ii) comparing the computed pressure traces with the measured ones for a vented corn starch dust explosion in a 11.5 m3 vessel, and (iii) highlighting the future work.