Heat Transfer: Stability issues for natural convectionIssueA natural convection simulation becomes unstable after several iterations. SolutionVerify 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.
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