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Forum: CFX November 28, 2012, 15:21
Replies: 20
Views: 5,053
Posted By brunoc
1. You are prescribing an outlet mass flow that...

1. You are prescribing an outlet mass flow that is a function of a constant corrected mass flow and varying outlet pressure and temperature. If outlet pressure and/or outlet temperature changes, you...
Forum: CFX November 26, 2012, 06:25
Replies: 20
Views: 5,053
Posted By brunoc
Hi Vit, That probably means that for a small...

Hi Vit,

That probably means that for a small change in pressure you can have a large difference in mass flow. If that is the case, you should consider setting a mass flow at your outlet region....
Forum: CFX November 21, 2012, 18:54
Replies: 20
Views: 5,053
Posted By brunoc
Once you reach choke, mass flow can no longer be...

Once you reach choke, mass flow can no longer be increased. But the corrected mass flow also takes local pressure and temperature into account, so even though your actual mass flow is fixed, by...
Forum: CFX November 20, 2012, 17:23
Replies: 20
Views: 5,053
Posted By brunoc
You should, since your boundary condition is not...

You should, since your boundary condition is not linear. I think it does it by default, but enable it just to be safe.

I don't recall the options for it, so you should check the documentation to...
Forum: CFX November 20, 2012, 16:55
Replies: 20
Views: 5,053
Posted By brunoc
P_{t_{out}} and T_{t_{out}} are calculated by the...

P_{t_{out}} and T_{t_{out}} are calculated by the solver. You can create an expression to take their values either locally or by using an average at you outlet condition.
Forum: CFX October 25, 2012, 08:42
Replies: 20
Views: 5,053
Posted By brunoc
I wasn't talking about general standards, I was...

I wasn't talking about general standards, I was talking about guidelines for simulating compressors. The link I posted has some general guidelines for turbomachineries, but the CFX documentation has...
Forum: CFX October 24, 2012, 16:29
Replies: 20
Views: 5,053
Posted By brunoc
Solver divergence can happen due to a lot of...

Solver divergence can happen due to a lot of reasons: boundary or initial conditions, solver parameters, equations modeled.

First of all you should take a good look at the best practices:...
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