| Sedullo |
January 16, 2020 12:14 |
Too low flow velocity results for a natural convection problem
2 Attachment(s)
I am simulating a heat exchange problem of natural convection, there is a hot plate on the central part of the right side, the left is set to slip condition and zeroGradient. Air temperature 300K and plate temperature 360K. After 100s of simulation, from paraview I can see that the velocity of the fluid is of the order of 10^-5 which I think is very very low, considering that in the blockMeshDict file I set "convertToMeters 0.01;" .
Where do you think a mistake could be?
I post the relevant bc and some pictures to make you understand better my problem.
Code:
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
sideWallheated
{
type noSlip;
}
rightsideWallsNotheated
{
type noSlip;
}
leftsideWallsNotheated
{
type slip;
}
inlet
{
type pressureInletVelocity;
value uniform (0 0 0);
}
outlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);
}
#includeEtc "caseDicts/setConstraintTypes"
}
Code:
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 0 0 1 0 0 0];
internalField uniform 300;
boundaryField
{
sideWallheated
{
type fixedValue;
value uniform 360;
}
leftsideWallsNotheated
{
type zeroGradient;
}
rightsideWallsNotheated
{
type zeroGradient;
}
inlet
{
type inletOutlet;
inletValue uniform 300;
value uniform 300;
}
outlet
{
type inletOutlet;
inletValue uniform 300;
value uniform 300;
}
#includeEtc "caseDicts/setConstraintTypes"
}
Code:
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -2 0 0 0 0];
internalField uniform 0;
boundaryField
{
sideWallheated
{
type zeroGradient;
}
leftsideWallsNotheated
{
type fixedFluxPressure;
}
rightsideWallsNotheated
{
type zeroGradient;
}
inlet
{
type totalPressure;
p0 uniform 0;
}
outlet
{
type fixedFluxPressure;
}
#includeEtc "caseDicts/setConstraintTypes"
}
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