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[mesh manipulation] Cylinder mesh - need for suggestions

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Old   October 22, 2019, 12:45
Smile Cylinder mesh - need for suggestions
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Maveryck Andres
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Hi everyone

currently I'm working on turbulence simulation with k-epsilon model over a cylinder channel. I'm getting a wird plot for all the variables and I'm pretty sure is because of the mesh, as you can see on the attached images the wird values of variable k are exactly located over the edges of the central block so I suspect there has to be a better way to mesh.

Any suggestion will be welcome



k.png
Mesh.jpg
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Old   October 23, 2019, 01:47
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Damian Berghof
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Hi Maveryck,
can you provide some more details?
- boundary conditions, model definition?
- geometry size, dimensions and scaling ok ?
best,
Damian
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Old   October 23, 2019, 04:46
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Carlo_P
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Hey Maverick,
take a look here:
https://sites.google.com/site/snappy.../cylinder-case
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Old   October 23, 2019, 11:14
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Maveryck Andres
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Quote:
Originally Posted by virengos View Post
Hi Maveryck,
can you provide some more details?
- boundary conditions, model definition?
- geometry size, dimensions and scaling ok ?
best,
Damian
It is a quite simple case, cyclic on the inlet and outlet with the following boundary conditions (it is worth mentioning that yPlus at the walls is 0.2 approximately):

Epsilon boundary conditions
Code:
dimensions      [0 2 -3 0 0 0 0];

internalField   uniform 0.6;

boundaryField
{
    inlet 
    { 
        type            cyclic;
    } 

    outlet
    {
        type            cyclic;
    }

    FixedWalls
    {
     type     zeroGradient;
          
    }
}
k boundary conditions
Code:
internalField   uniform 0.05;

boundaryField
{
    inlet 
    { 
        type            cyclic;
    } 

    outlet
    {
        type            cyclic;
    }

    FixedWalls
    {
     type     fixedValue;
     value     uniform 1.0e-08;
    }
}
U boundary conditions
Code:
internalField   uniform (0.1 0 0);

boundaryField
{
     inlet 
     { 
        type            cyclic;
     } 

    outlet
    {
        type            cyclic;
    }

    FixedWalls
    {
        type            noSlip;
    }
}
The domain is a pipe with diameter = 0.1m and length = 0.1m and bulk velocity is fixed to 1.9 m/s through a momentumSource:

Code:
momentumSource
{
    type            meanVelocityForce;
    active          yes;

    selectionMode   all;

    fields          (U);
    Ubar            (1.9 0 0);
}
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