Hello, I'm attempting to model the temperature rise above ambient over the period of one day within a sealed concrete trough buried in soil with its top exposed to outside air. I have successfully created this simulation in version 3.5a but I have been unable to get close to the same results from the resulting simulation in 4.0a. I have also not been able to find anything in the model gallery having to do with natural convection for version 4.0a. Any help is greatly appreciated, I can include a file if needed.
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