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Problem with a pressure outlet BC

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Old   August 10, 2015, 04:42
Default Problem with a pressure outlet BC
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Luca Pavan
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Hello everyone,
i'm using OpenFOAM for an incompressible simulation of an external aerodynamic combined with the study of the intake system of a motorbike's fairing.
I'm using PISO algorithm and i want to impose a BC of pressure outlet on a patch at the end of a channel connected to the fairing.
I've used:
p
outlet1
{
type fixedValue;
value uniform 160.701;
}

U
outlet1
{
type inletOutlet;
inletValue uniform (0 0 0);
value $internalField;
}

With these BC i've got divergence problem after 400 iteration, anyone can suggest any BC to impose?

Thanks in advance.
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Old   August 10, 2015, 05:38
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anonymous
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You should also use inletOutlet for the pressure if you are using it for the velocity
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Old   August 10, 2015, 15:53
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Luca Pavan
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I've imposted that BC, but it still got has divergence problem.

outlet1
p
{
type inletOutlet;
inletValue uniform -160.701;
value uniform -160.701;
}
outlet1
U
{
type inletOutlet;
inletValue uniform (0 0 0);
value $internalField;
}
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Old   August 11, 2015, 05:49
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Are you sure of the inletValue of U?
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Old   August 11, 2015, 05:54
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Luca Pavan
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What i want to do is to set on that patch the pressure, a value that i know, and when the simulation is converging extract the volumetric flow rate.
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Old   August 11, 2015, 08:00
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Luca Pavan
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I'm using a K-omega SST turbolence model, I've seen that the residual that firstly diverge is the k. I report tha BC that i've used for outlet1 for k, omega and nut.

outlet1
k
{
type inletOutlet;
inletValue $internalField;
value $internalField;
}

outlet1
nut
{
type calculated;
value uniform 0;
}

outlet1
omega
{
type inletOutlet;
inletValue $internalField;
value $internalField;
}

Thanks in advance!
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