Learning Forum

[vladr]

Hi All,

I am working on a problem of natural convection inside a vertically oriented cylindrical cavity, I have both axisymmetric and 3-D versions of it. In both of them the velocity field has a line of abruptly changing vector magnitude (and sometimes direction) in the location where the inflation layer is merging with the bulk mesh (on the pics below gravity is to the left).

[Rob]

How does the convergence look? Please can you zoom into the problem area and plot vectors with the mesh on too? How do the other flow fields look?n

[vladr]

@Rob,nAs far as convergence, before I was converging the momentum equations to 10^-6 absolute without any problems, but now I've run it to the limit and the residulas fall below 10^-12.nHere is the the vector plot in the mesh in the problematic area:nAnd the velocity magnitude colormap:nAs far as the other field variables, they look OK, see for example, the temperature plots below:nn

[Rob]

That's not something I've seen in the modern releases with a good mesh: Fluent 4 used to have some weird things happen but you also near enough needed a PhD to know how to switch it on. How does it look in 2020R2? The noise on the residuals is normal for buoyant flows and is just slight transients in the flow. n