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Search: Posts Made By: ghorrocks
Forum: CFX October 28, 2010, 19:16
Replies: 21
Views: 14,178
Posted By ghorrocks
Bulk quantities changing also applies to...

Bulk quantities changing also applies to transient simulations. As the solver iterates to a solution for a given timestep it adjusts the P, V, T fields to obtain convergence. So you need to make sure...
Forum: CFX October 22, 2010, 07:05
Replies: 21
Views: 14,178
Posted By ghorrocks
1) Mesh quality - this is not an error, it just...

1) Mesh quality - this is not an error, it just means your poor quality mesh will make it harder to obtain convergence. With a bit of effort you will probably be able to get it to converge, but time...
Forum: CFX October 21, 2010, 21:14
Replies: 21
Views: 14,178
Posted By ghorrocks
Incorrect. When the temperature range becomes...

Incorrect. When the temperature range becomes large enough the bossinesq assumption looses accuracy. You need the full ideal gas equation so the variable density can be accounted for. It is not a...
Forum: CFX October 20, 2010, 19:13
Replies: 21
Views: 14,178
Posted By ghorrocks
1) The thermal energy option means constant...

1) The thermal energy option means constant density. Buoyancy can be modelled using the bousinesq approximation but that is only accurate for small temperature ranges. My guess is your air will get...
Forum: CFX October 20, 2010, 07:15
Replies: 21
Views: 14,178
Posted By ghorrocks
I can see a few errors. 1) You have set the...

I can see a few errors.
1) You have set the domain to be "Thermal Energy". This models a heat equation but you will want "Total Energy" to allow the gas to have variable density.
2) You are using...
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