Granulation or agglomeration process of solid particles was applied in a wide range of the industrial fields including steel making [1], pharmaceutical industry [2] and and powder metallurgy [3]. In the iron-making industry, agglomeration process is one of the most critical stages in the sintering process. An agglomeration drum is a rotating, cylindrical dum which utilizes a tumble and grow action to form spherical granules in the presence of a liquid binder. More specifically, material and liquid binder are fed into the drum. As the drum rotates, material fines get tacky in the presence of the binder, and pick up more fines as they contact with other wet particles. There are various parameters which effect on the granule formation and development including initial particle size distribution, raw material properties, filling level of particles in the drum, the amount and viscosity of the binding liquid, ratio between drum diameter and particle size, the particle size, and rotational speed of drum. In this work, we simulate the agglomeration process of solid grains composed of spherical particles in the presence of a viscous liquid by means of molecular dynamics (MD) simulations [4]. We are mostly interested in application to iron ore granulation in a rotary drum agglomerator. We are also interested in understanding the agglomeration process at the particle scale like accretion, erosion, redistribution of binding liquid. And investigation the effects of control parameters such as flow regime (rotational speed) which defined by Froude number, and initial size distribution. The presence of liquid binder is modeled as a capillary attraction force as well as liquid viscous force. The capillary cohesion force is simulated as an attraction force at the contact between particles and expressed as an explicit function of the gap, liquid volume, surface tension and the particle-liquid-gas contact angle [5]. During the rotation, the dry particles flow around the spherical granule. This state continuously occurs the accretion and erosion phenomenon between dry and wet particle. We find that the granule growth increases exponentially with the number of rotations of drum. This growth rate is proportional to the increase of size ratio. However, the changing of different values of Froude number between rolling and cascading regime can not dominate the granule growth.