Dry　reforming　of　methane　(DRM)　is　one　of　the　feasible　strategies　for　carbon　capture　and　utilization.　However,　the　DRM　process　has　a　high　tendency　toward　carbon　deposition,　which　is　restricted　to　industrial　applications.　In　order　to　further　improve　coke　formation　resistance,　open-cell　foam　with　hierarchical　pore　structure　was　investigated.　An　artificial　algorithm　was　adopted　to　construct　a　hierarchical　pore　structure　in　open-cell　foam.　Based　on　a　3-D　lattice　Boltzmann　model,　this　work　explored　the　effect　of　two　hierarchical　pore　structure　parameters　on　the　fluid　flow　and　coke　formation　characteristics　in　open-cell　foam,　which　are　hierarchical　pore　volume　ratio　(V2/V1)　and　hierarchical　pore　size　ratio　(d2/d1).　The　results　indicated　that　increasing　V2/V1　and　d2/d1　can　significantly　promote　permeability.　Under　the　restriction　ofV2/V1　=　4,　from　d2/d1　=　1　to　4,　the　coke　formation　rate　decreases　by　approximately　57.49　%.　These　findings　provide　a　theoretical　basis　and　technical　guidance　for　designing　and　developing　open-cell　foam　reactors.　©　2022　Elsevier　Ltd