I set up a parabolic trough with a solar receiver tube, covered with a glass cover, in Solidworks 2019 SP 5.0. Thereafter I did a flow simulation upon it, trying to figure out the solar radiation flux upon the outer surface of the solar receiver tube. According to the calculation, it should be about 10,000 W/m2 on the lower semi-surface of the solar receiver tube. However, mine is only about 100-200 W/m2. I don't know where the error is. I recorded the whole process in the attached file.
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