Heat Transfer: Stability issues for natural convection

Nov 1, 2014

Issue:

A natural convection simulation becomes unstable after several iterations.

 

Solution:

Solution

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.

Products:

Simulation CFD

Versions:

2010;2011;2012;2013;2014

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