On 8/4/24 02:52, Tiny Y wrote:
:
1. took theta as 1.
2. multiplied the coefficients cd(volumetric heat capacity ) and kt(heat
transfer coefficient) in front of mass matrix and stiffness matrix to
10^6(J/(m^3·℃)) and 0.34（W/(m·℃)) respectively.
3. imposed Dirichlet boundary conditions (colorize=true, -50 ℃ for boundary
id=0, 0 for boundary id=2,4, and took the original periodic RHS of step-26 to 0)
微信图片_20240804165104.png
Then I noticed that positive temperatures appear in the interior of the domain.
What's the cause of this?
How do you choose the time step? If you change the coefficients, you in
essence change the *time scales* at which change happens. You have to adjust
the length of the time step accordingly.
Best
W.
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Wolfgang Bangerth email: [email protected]
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