Abstract: An experimental study has been carried out to investigateinteraction between flame and circular cylinder suspended in the middle ofchamber to observe flame and flow structures. The simulation of thisexperiment by high accuracy PPM scheme is presented. In the scheme, theturbulent model is used with Large Eddy Simulation (LES) and the reactionrate model with eddy-break-up (EBU) model. The immersed boundary method(IBM) was used to solve boundary condition of circular cylinder. Thesimulation results were in good agreement with the experimental results. Itcan reveal the characteristics of acceleration and distortion of flamefront. Furthermore, this paper discussed 3D shape of flame front, vortex andturbulent kinetic energy in the chamber, the interaction between flame andflow, the flame front location.