The parabolic trough solar collector consists of a parabolic reflector to concentrate the solar rays at its focal line, where the receiver system is located. The receiver system includes an absorber copper tube. The heat transfer fluid inside the copper absorber tube. Copper tube received solar radiation directly from the sun and indirectly from the reflector. How we can simulate solar radiation on the copper tube for parabolic trough solar collector using ANSYS Fluent?