Simulation CFD - Natural Convection with Mesh Adaptation
Problem:
During the interpolation and restart of Natural Convection models with Mesh Adaptation, the solution can appear to have accelerated flow or become unstable.
Reason:
Buoyant flow is highly sensitive to subtle differences in the density gradient. As the solution is interpolated on to the new mesh, if there is a difference between the interpolated temperature gradient and the respective density / velocity gradient, this can cause a minor flow acceleration that has the possibility of running away.
Solution:
When running Natural Convection models with Mesh Adaptation, under the Flag Manager use the following flag: adapt_start_from_0
This will force the solution to start from the beginning to ensure stability and accurate results for buoyant models..
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