A set of 20 three-dimensional Direct Numerical Simulations is computed and analysed. Imploding and expanding spherical flames of steam-methane-hydrogen-air mixtures are simulated using a single step chemistry whose coe cients are set using complex chemistry. Both turbulent and laminar cases are performed. The total flame surface and internal volume of gases are extracted from these simulations. The mean consumption speed and flame speed are determined for laminar and turbulent flames. A particular attention is given to describe the e ffect of high steam content, turbulence and fuels on flame speeds and flame topologies.