solar radiation

Arnold

Dear all,

I am modeling solar radiation on building and faced some problems. I have tried both the DO solar and solar ray tracing method but they both give me unreasonable results. I have used the k-e model to model the flow around building. Then, I applied the solar radiation on it. I set all the walls having a temperature of 26 degrees and having a thickness of 0.3m and the inlet flow is also in 26 degrees. However, it gives me a result that the outer temperature in some places of the wall is less than 26 degrees so much. They mostly occur near the edge. Could anyone can help me to solve it?

Thank you very much