[Camiwu]

hi, I'm struggling writing a udf code that will update the lengths section of a thermosyphon based on the calculated heat transfer value. I'm using the execute_at_end function. any recommendation on how to calculate heat transfer on a solid 2d domain on the y axis with a convective boundary condition. and based on the heat transfer value check the boundary faces of the boundary thread, store the values of the faces that belong to each section based on the heat transfer value, and used this values to calculate thermal resistance. and repeat this process iteratively until the top of the thermosyphon reaches a certain value. transient conditions.