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How to call an analytical function for a boundary condition
Posted Feb 29, 2024, 8:47 a.m. EST Heat Transfer 2 Replies
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Hello,
I'm studying the thermal evolution of a "mass stove". I considered a hollow cylinder with r_i and r_e as inner and outer radius, respectively. I would like to have a temporal dependent boudary condition on r_i which represent the heat flux due to the combustion. This function is : 1750*t*exp(-0.002*t)/100 . I define this analytical function in the component section. And my question is : how to call this function when I set the heat flux on the boudary. It seems only accept a Value and not an analytical expression as input.
Thank you for your answers !
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Salut Bertrand,
This sounds strange to me. Either you could just type the expression directly as a general inward heat flux:
1750[W/m^2]*t*exp(-0.002[1/s]*t)/100[s]
(here I have assigned some units to avoid unit warnings, but I'm not sure if it's correct.)
Or you could also define an analytic function, say an1, as the expression
1750[W/m^2]*x*exp(-0.002[1/s]*x)/100[s]
and an argument x with the unit s. Then call it in the text field for the heat flux as an1(t) in a time-dependent simulations.
Both cases should work.
Best regards,
Magnus
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Thank you ! It works now with your first option.
Have a nice day !
Bertrand