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filling a tank with water

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Old   June 11, 2014, 10:50
Default filling a tank with water
  #1
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ashwin
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Hello,

I am trying to fill a tank with water as shown in the figure. The red line indicates the water inlet at t=0 and the green line indicates the air exit. The picture was taken at 46 secs with the timestep being 0.0001. I have been running the case for over two weeks and the water level stopped to be filled in as in the screenshot. I am using the following initial conditions.

alpha.water
Code:
dimensions      [0 0 0 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            inletOutlet;
        inletValue      uniform 1;
        value           uniform 1;
    }
    outlet
    {
        type            zeroGradient;
    }
    walls
    {
        type            zeroGradient;
    }
}
p_rgh
Code:
dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedFluxPressure;
        value           uniform 0;
    }

    outlet
    {
        type            outletInlet;
	outletValue	uniform 0;
    	value		uniform 0;
    }

    walls
    {
         type            totalPressure;
        p0              uniform 0;
        U               U;
        phi             phi;
        rho             rho;
        psi             none;
        gamma           1;
        value           uniform 0;
    }

    
}
U
Code:
dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
        type           fixedValue;
        value           uniform (2 0 0);
    }

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

    walls
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    
}
Can somebody indicate me where I am going wrong or tell me how to speed up the calculation.

Regards
Ashwin
Attached Images
File Type: jpg filling .jpg (12.9 KB, 364 views)
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Old   June 11, 2014, 19:11
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  #2
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Wouter van der Meer
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hello ashghan,
The problem is the pressure definition. The number of variables is not equal to the number of freedom. Your system needs a point where the pressure is known.
If you look at the angledDuct turorial and remove the viscosity things (in 0 dir two boundaries, in fvOptions remove all you have a working case. I did this with a simple form of your fueltank? It ran for less than 4 hours.
I enclosed my case, but I had to remove the mesh because of the size restrictions.

Hope this helps
Wouter
Attached Images
File Type: jpg time18_5.jpg (22.3 KB, 296 views)
Attached Files
File Type: gz fueltank.tar.gz (2.5 KB, 254 views)
behcfd, physicosm, mikulo and 1 others like this.

Last edited by wouter; June 15, 2014 at 19:00.
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Old   June 18, 2014, 09:28
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ashwin
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Hey,

Yeah it works. Thanks


Quote:
Originally Posted by wouter View Post
hello ashghan,
The problem is the pressure definition. The number of variables is not equal to the number of freedom. Your system needs a point where the pressure is known.
If you look at the angledDuct turorial and remove the viscosity things (in 0 dir two boundaries, in fvOptions remove all you have a working case. I did this with a simple form of your fueltank? It ran for less than 4 hours.
I enclosed my case, but I had to remove the mesh because of the size restrictions.

Hope this helps
Wouter
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Old   August 21, 2017, 08:15
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Hi,

I am trying to solve water filling bottle tutorial from long back (http://www.tfd.chalmers.se/~hani/kur...Hemida_VOF.pdf). I am not getting reasonable results.

I used inlet velocity as 0.1 m/sec. I am attaching my FOAM files. Please kindly let me know what mistake I am doing.
Attached Files
File Type: zip bottlefill.zip (8.9 KB, 31 views)
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