I set up a flow simulation study to find the temperature of a plastic block when subjected to solar radiation as well as convection from ambient air at a certain speed. I did an external flow study with radiation, but I did not know how to simulate the convection, which led to inaccurate temperature results (less than the ambient temperature I set). I attempted to insert inlet velocity to the surface, of air with a certain temperature, but it still gave me this result. Any idea how can I run this study?