Heat Transfer: Stability issues for natural convection
A natural convection simulation becomes unstable after several iterations.
Verify that the setup is physically correct and that there is a specified temperature somewhere in the model. (This
may be the Reference Temperature of a Film Coefficient boundary condition.)
If the setup is correct, the problem may be that the turbulence model is having trouble with the solution. Try
eithehr of the following actions:
• Try modifying the Turb/Lam ratio to be 500.
• If the problem persists, change the Turbulence model to the Mixing Length Turbulence model.
To make either of these changes:
1. Open the Solve dialog.
2. Click the Physics tab, and click the Turbulence button.