Recently, there is a high interest to use lightweight aluminum foams for automotive, railway andrnaerospace applications. Aluminum foam is usually used for energy absorption purpose forrncrashworthiness application because of its high ductility and deformability. However, to keep thernsafety and to avoid occupant injuries it is necessary to absorbed high impact energy generatedrnduring collision. Therefore, to absorb high impact energy, the crash box material needs a specialrnmaterial microstructure which is light in weight and can absorb more energy than the existing onernlike CaCo3, SiC. B4C etc.rnIn particular, the analysis of energy absorption of aluminum foam in automotive for energyrnabsorption applications is limited. The main objective of this research is to model and analyze,rnimpact energy absorption of aluminum foam using the numerical approach. For this purpose, first,rnfifteen aluminum foam CAD were developed by using Digimat multi-scale material modelingrnsoftware. Second, cubic elements with circular pore shape at 5%, 10% and 15% void percentagernand at 1.5mm, 2mm, 2.5mm, 3mm and 3.5mm pore sizes were modeled. Finally, the numericalrnanalysis of impact energy was carried out by using ANSYS workbench 19.2 Explicit dynamics byrnapplying initial low velocity was performed. The parameters such as pore size, voids percentagernand inclusion particles were compared to each other to optimize the proper percentage compositionrnand cell size for the best of energy absorption applications. The effects of pore size, foaming agentrnand percentage composition on energy absorption were discussed. In addition the deflections,rnreaction forces, accelerations, specific energy absorption, energy absorptions for all the models arernalso determined with variable pore size and volume of porous, and it was compared with the effectsrnof agents on those variables. rnResults showed that the Aluminum foam with 10% void fraction at bubbles (voids with air) sizernof 2.5 mm exhibited better energy absorption and more stable was founded to be best candidaternmaterial for impact energy absorbing device.