Parabolic Trough Collector flow-simulation involving solar radiation problems

I have designed the parabolic surface using the parabola tool and place a copper tube at its focal point. Now in flowsimulation, I have set the solar radiation in general settings and inlet flow rate/outlet pressure as boundary conditions. I have also set the parabolic surface to be symmetrc in radiative surfaces. When I run it, the temperature of the liquid has barely changed, the problem is that, the sun rays are not being reflected by the parabolic surface or not being absorbed by the copper pipe. What am I missing?

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Hey buddy, I saw your post on reddit so I came here: did you find a solution?
I have the same problem, and the solar ray-tracing part in Flow Simulation is not giving reliable results to me either. I can use data from another ray-tracing software, Tonatiuh, so that is, I think, taken care of. Have you found a way to at least know where the problem comes from? Because I could't find a way to see if the problem is the reflector (most likely) or something else. ...

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