Premixed combustion in closed spherical vessel with center ignition
 

currently, I have problem to simulate the combustion in the closed cylindrical vessel with center ignition(not on the wall of cylinder). my simulation do not hav any inlet or outlet and the mixture of methane air is to be already homogeneous in the vessel, because my concern is only to study the sperical flame propagation during the explosion. anyone can help me solve this problem? anyone have the tutorial regarding this problem?