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[Sampat Kumar]

 

Hi Sara, 
Will you please share the screenshot of the model as well as the mechanical tree? 
For more information, you can follow the following link that might be useful. 
https://courses.ansys.com/index.php/courses/topics-in-heat-transfer-analyses/lessons/how-to-model-thermal-radiation-between-surfaces-lesson-3/
Thermal Radiation Examples | Ansys Innovation Courses

All the best!
Sampat 

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