TAGGED: -reflection, fluent, mechanical, radiation, speos
March 25, 2023 at 5:16 pmnicko627Subscriber
I've been doing a simple analysis with an Irradiance sensor some distance away from a sphere emitting radiation. I put a mirror behind the sphere, which reflects the radiation back towards the sensor.
The simulation seems to work fine, except when I change the reflectivity of the mirror, the amount of irradiance doesn't change at all. I would expect if I change reflectivity to 0 vs if it is at 100, then that would at least have some effect on the rays that bounce off the mirror and the calculation of irradiance. Am I misinterpreting the reflectivity? I'm essentially equating it to emissivity. The material I'm using is opaque for everything, and I didn't choose anything from a library: just the default material where you can change the reflectivity.
I tried using Fluent or Mechanical for this same type of simulation, but I couldn't figure out how to get those set up to give the results I was expecting. I don't care about the heat transfer, just the ray tracing and a plot of where the rays are landing most often on a sensor.
Let me know if you have any other questions, in case I left something out.
March 27, 2023 at 11:43 amAshish KhemkaAnsys Employee
Please see if the following link helps you:
GPU-Based Compute for Ray Tracing Makes Simulating Light More Accessible and Powerful Than Ever (ansys.com)
March 27, 2023 at 12:32 pmnicko627Subscriber
I checked the link, and it didn't answer my original question. I was curious why reflectivity of a surface didn't seem to change the irradiance that I was measuring at a sensor, even though it seems like reducing reflectivity would reduce the amount of light being reflected and sent to the sensor.
April 11, 2023 at 8:12 amThomas MartineauAnsys Employee
Could you add a picture of your setup ?
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