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Constant mass flow rate in channel flow LES

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Old   May 10, 2018, 02:29
Default Constant mass flow rate in channel flow LES
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Vishwesh Ravi Shrimali
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Hi!
I am trying to simulate channel flow simulation in OpenFOAM for constant mass flow rate. I found a test case for channel flow which uses a
Code:
momentumSource
in
Code:
fvOptions
file:

Code:
momentumSource
{
    type            pressureGradientExplicitSource;
    active          on;            //on/off switch
    selectionMode   all;       //cellSet // points //cellZone

    pressureGradientExplicitSourceCoeffs
    {
        fieldNames  (U);
        Ubar        ( 0.1335 0 0 );
    }
}
How can we use constant mass flow rate in Channel flow case? The test case can be found here.

Thanks in advance
Vishwesh
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Old   May 10, 2018, 03:12
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Robert
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Quote:
Originally Posted by vishwesh View Post
Hi!
I am trying to simulate channel flow simulation in OpenFOAM for constant mass flow rate. I found a test case for channel flow which uses a
Code:
momentumSource
in
Code:
fvOptions
file:

Code:
momentumSource
{
    type            pressureGradientExplicitSource;
    active          on;            //on/off switch
    selectionMode   all;       //cellSet // points //cellZone

    pressureGradientExplicitSourceCoeffs
    {
        fieldNames  (U);
        Ubar        ( 0.1335 0 0 );
    }
}
How can we use constant mass flow rate in Channel flow case? The test case can be found here.

Thanks in advance
Vishwesh
Why not use the fvOptions entry you've found?
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Old   May 10, 2018, 03:15
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Vishwesh Ravi Shrimali
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I actually want to make changes in the geometry and see the affect it has on the wallShearStress and I thought it would be easier to use constant mass flow rate for the analysis rather than the constant pressure.
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Old   May 10, 2018, 03:30
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Robert
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Quote:
Originally Posted by vishwesh View Post
I actually want to make changes in the geometry and see the affect it has on the wallShearStress and I thought it would be easier to use constant mass flow rate for the analysis rather than the constant pressure.
Ah okay. You can take a look at the other possible fvOptions entries. Maybe you find something you can use. Possible sources are explained on this website: http://www.geocities.jp/penguinitis2...fvOptions.html
Just use google chrome or google translate on the website
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Old   May 10, 2018, 09:10
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Santiago Lopez Castano
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Quote:
Originally Posted by vishwesh View Post
I actually want to make changes in the geometry and see the affect it has on the wallShearStress and I thought it would be easier to use constant mass flow rate for the analysis rather than the constant pressure.
Although a bit incidental to the discussion, I'm curious to know how does using a constant mass fliw rate make the analysis easier? I mean, i would expect that by virtue of Newton's second law it'd be easier to analyse and balance shear stress with pressure gradients
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