August 21, 2018 at 8:26 amCsongor VaradiSubscriber
Dear ANSYS users,
I'm trying to simulate the cooling of an aluminium block inside a vacuum chamber by using a meander fixed to a copper plate (See screenshots below). For boundary conditions I have set a heat flow on the inside of the piping with -112.5 W, and a radiation on the inside enclosure of the vacuum chamber with an ambient temperature of 20°C and an emissivity of 0.8. Initial temperature is set to 20°C. The outer surface of the chamber is set to a temperature of 20°C.
If I set the heat flow to be positive (i.e. heating) the simulation converges just fine, however if I use a negative heat load the simulation fails to converge, or does so extremely slowly. The problem might lie with the radiation boundary condition, however I am somewhat stuck and can't progress with the issue, so any help would be appreciated.
August 23, 2018 at 12:55 amKarthik RAdministrator
What is the direction of heat flow in your problem? A positive value indicates heat flow into the node, while a negative value indicates out of the node.
Have you tried to isolate the problem by switching off the radiation heat transfer?
Also, could you please help us understand your problem a little better? What are you looking to model?
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