Devendra Badgujar
Forum Moderator

Hello JiWon, 

From your question, it looks like the regions are not captured by the simulation with the fidelity you are using in Explore stage and so the temperature around those areas does not show correctly. Increasing the fidelity may resolve these issues. Use the Fidelity slider under the SID to capture those regions. 

Please refer CHT Analysis in Ansys Discovery | Ansys Courses to see if the setup and other conditions are correctly set. 

Let me know if further assistance is needed.