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Hydraulic Pipe Flow, which solver & BC:s?

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Old   February 7, 2012, 05:16
Exclamation Hydraulic Pipe Flow, which solver & BC:s?
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Johan Magnusson
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Hi!

Im trying to run a hydraulic pipe flow case. The case is basically very simple, more or less a pipe with a converget-divergent nozzle. Im assumed to know the inlet pressure and outlet pressure. Nothing else, i.e unknown velocities.

1. Initially, which solver should i use?
I've tried with simpleFoam

2. Which pressure BCs should i use?
My set-up now looks like this:

boundaryField
{
inlet
{
type fixedValue;
value uniform 12000000;
}
wall
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 2000000;
}
}

3. Which U BCs should i use?
Im now using a set-up like this
{
inlet
{
type pressureInletOutletVelocity; ;
value uniform (0 0 0);
}
wall
{
type fixedValue;
value uniform (0 0 0);
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
}

I've also tried zeroGradient without success!


Plz help me out, its so easy to setup using Ansys CFX, a verification in OF would be preferable!

BR
/magjohan
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Old   February 7, 2012, 11:50
Default U zeroGradient inlet
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AV.
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Did you try to set U as zeroGradient in the inlet BC ?
I mean :
{
inlet
{
type zeroGradient;
}
wall
{
type fixedValue;
value uniform (0 0 0);
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
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Old   February 8, 2012, 10:52
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Hi johan,

I am a new to openfoam and cfd in general.
I want to simulate a steady state, compressible flow of air through a bent pipe. Which solver can i use for this in Openfoam??

It would be great to get some help regarding my problem.

Thanking you in advance

Regards
Abhinay
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Old   February 8, 2012, 17:02
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Johan Magnusson
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Hi, I have tried with the mentioned boundary conditions, without any good results.

Andrev: I would make it simple and use the already implemented rhoSimplecFoam
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Old   February 28, 2012, 07:58
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Quote:
Originally Posted by magjohan View Post
Hi, I have tried with the mentioned boundary conditions, without any good results.

Andrev: I would make it simple and use the already implemented rhoSimplecFoam

Hi Johan, do u have any improvement?

My case is i know inlet T, P and Velocity...also outlet T, P....

Hoever i want to let the openfoam to calculate the outlet Velocity ...I tried to use

oulet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}


but i dont know if setting value uniform (0 0 0); is correct or not?!
}
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