the heat flux density not constant?

- December 17, 2019 at 1:12 pm
  
  Jackely
  Subscriber
  
  Hi all,
  
  why is the heat flux density not constant on the surface to which I typed the heat flux density as a constant value (1000 W/m2).
- December 18, 2019 at 12:14 pm
  
  peteroznewman
  Subscriber
  
  The theoretical framework of the Finite Element Method has two types of Boundary Conditions: Essential and Natural.
  
  Essential Boundary Conditions are on the quantity being solved for, Temperature in this case, and are solved for exactly in the solution.
  
  Natural Boundary Conditions are derived from the Temperature solution and are solved for approximately. You can reduce the error in the approximation by using a smaller element size.
  
  These concepts are covered very well in the Course linked to at the top of this page.
  
  Add a Mesh Control called Inflation to the body and use that face as the boundary. That will create a few layers of thin elements from that face. This should help reduce the error in the Heat Flux on that face. Note that heat flux is approximately solved for throughout the mesh, but is most noticeable in regions of high temperature gradient.
  
  If this answers your question, please mark the post with Is Solution to show the discussion is Solved, or ask a followup question.
- December 18, 2019 at 12:54 pm
  
  Jackely
  Subscriber
  
  Thank you very much for your very helpful Answer

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