[ErenC]

Hello again dear CFD nerds!

I have a CHT case with radiation (external beam, or solar load) it is basically:
Outer region (fluid), middle region (solid), and inner region (fluid). I want to calculate the irradiation inside the inner region. Top picture shows the outer region, and bottom picture shows the inner region. I think there is a problem with my middle region BCs. Because outer region and inner region G fields are not really in agreement. (outside region field shows an expected behavior, walls are reflective and top is transparent). Middle region is transparent, but I realised solver does not even reads the boundaryradiation file in middle(solid) region!

So what should be the appropriate BC to correctly calculate irradiation inside the inner region? Any help willbe appreciated!