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Forum: CFX September 27, 2012, 18:22
Replies: 11
Views: 3,562
Posted By ghorrocks
I am amazed your results are that accurate when...

I am amazed your results are that accurate when you have suppressed some apparently important physics (Coanda, oscillatory flow). These effects could easily modify the pressure loss by quite a bit.
Forum: CFX September 18, 2012, 00:50
Replies: 11
Views: 3,562
Posted By ghorrocks
Transient simulations take a long time, that is...

Transient simulations take a long time, that is unavoideable.

If you are taking 10-14 coeff loops per time step then you should use adaptive time stepping to target 3-5 coeff loops per time step....
Forum: CFX September 15, 2012, 07:20
Replies: 11
Views: 3,562
Posted By ghorrocks
If you get vortex shedding (especially transient...

If you get vortex shedding (especially transient shedding like a von Karman vortex street) then you will never get a steady state simulation to converge. You have to model it transient as the flow is...
Forum: CFX September 12, 2012, 08:17
Replies: 11
Views: 3,562
Posted By ghorrocks
In that case it could be laminar or turbulent...

In that case it could be laminar or turbulent depending on many things. You are going to have to work out which way it is. But my suggestion is to assume turbulent and use a turbulence model suitable...
Forum: CFX September 11, 2012, 19:21
Replies: 11
Views: 3,562
Posted By ghorrocks
See this FAQ:...

See this FAQ: http://www.cfd-online.com/Wiki/Ansys_FAQ#My_steady_state_solution_converges_for_a_while_but_stops_converging_before_reaching_my_convergence_criteria

Also are you sure this is...
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