In this work, verification and validation of a novel opensource CFD solver PDRFOAM, which is a gas explosion solver based on PDR (Porosity/Distributed Resistance) concept is explored. The solver is capable of solving premixed/partially premixed explosion cases in the presence of standard industrial obstacles such as pipe and vessels etc. The codPeak Pressure (mbar) 1227 1060.23 1070.5 1225

e is based on RANS framework. The combustion modelling uses the flamelet model, and k-epsilon turbulence model has been used for generation of turbulence behind the obstacles. PDR modelling is based on modifying the governing equations based on the volume and area porosities of the computational cells. It is used to account for the effects of the obstacles, that are smaller than the grid on the flow, combustion and turbulence implicitly through sub-grid models. Combustion case comprising of complex geometric configurations has been simulated and the results are compared with the standard literature. The peak pressure obtained in a combustion test cases is in reasonable agreement in the reacting test cases considered in this study. Moreover, regress variable contour plots appear to capture the flame interactions by capturing the unburnt and fully burnt reactants. The numerical sensitivity and robustness of the solver have also been investigated by varying the grid resolutions. The solver is able to portray reliable predictions with less computational requirements compared to standard body-fitted approach used in CFD.