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Pipe flow turbulence modeling

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Old   August 26, 2024, 05:21
Default Pipe flow turbulence modeling
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Hyun Jung Lee
Join Date: Aug 2024
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oneway0624@naver.com is on a distinguished road
Good afternoon guys.
I'm a new user of SedFoam model to simulate pipe flow with sediment.
I just want to validate the model to check non-deposition condition.
I set 0.02 m/s for fluid and sediment's velocity and the others were not editted.
For the simulation time was set to endTime 30, writeInterval 0.3, but the simulate was terminated at 16.442 s with very small delta T and high max epsilon.b, k.b, nut.b, Ua and Ub. Could you help me to solve these problems?
Or It would be really helpful if you correct me about patches' type or values.
Thanks..!

object p_rbgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [1 -1 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type fixedValue;
value uniform 0;
}
wall
{
type zeroGradient;
}
}


// ************************************************** *********************** //

object Ua; (Ub was same)
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0.0 0 0);

boundaryField
{
inlet
{
type fixedValue;
value uniform (0.02 0 0);
}
outlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);
}
wall
{
type noSlip;
}
}


// ************************************************** *********************** //

object epsilon;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -3 0 0 0 0];

internalField uniform 2.98e-9;

boundaryField
{
inlet
{
type fixedValue;
value uniform 2.98e-9;
}
outlet
{
type inletOutlet;
inletValue $internalField;
}
wall
{
type epsilonWallFunction;
value $internalField;
}
}


// ************************************************** *********************** //

object k;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 1.5e-6;

boundaryField
{
inlet
{
type fixedValue;
value uniform 1.5e-6;
}
outlet
{
type inletOutlet;
inletValue $internalField;
}
wall
{
type kqRWallFunction;
value uniform 0;
}
}


// ************************************************** *********************** //

object muI;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField uniform 0.01;

boundaryField
{
inlet
{
type fixedValue;
value uniform 0.01;
}
outlet
{
type zeroGradient;
}
wall
{
type zeroGradient;
}
}


// ************************************************** *********************** //

object alpha_a;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 0 0 0 0 0 0];

internalField uniform 0.010119;

boundaryField
{
inlet
{
type zeroGradient;
}
outlet
{
type zeroGradient;
}
wall
{
type zeroGradient;
}
}


// ************************************************** *********************** //
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Tags
boundary condition, input, patch, sedfoam, turbulence


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