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Initialising buoyantSimpleFoam using ISA equations |
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October 3, 2017, 15:23
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Initialising buoyantSimpleFoam using ISA equations
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#1 |
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Member
Join Date: Jun 2017
Posts: 58
Rep Power: 9  |
Hi all
I'm trying to model simplified atmospheric flow and thermal updrafts in buoyantSimpleFoam. Right now I'm trying to get the case to run before adding the complications of thermal effects. The case is 2D, 10 by 605km, and I've disabled turbulence to further simplify the case while I track down where my errors lie. So I am using funkySetFields to initialise p and T, going by standard ISA equations (http://www.wxaviation.com/ISAweb-2.pdf). The domain is a rectangle with bottom slip boundary condition, representing the ground, and ceiling is symmetry. The left hand side is going to be a velocity inlet and right hand side a pressure outlet, but just now I have disabled velocity in an effort to track down why my case is crashing. Initially, the fields seem reasonable: p:  T:  However, the case immediately explodes, unless I massively relax it, where I get a strange solution after a few iterations:     The result is the same at the opposite end of the case. The initial values are correct and physically realistic, so either my boundary conditions are wrong, or buoyantSimpleFoam is unsuitable for modelling this type of situation. If this is the case, could someone point me in the direction of a more suitable solver? Here are the relevant files from /0, although I've redacted the internal field sections to make them more readable. Note that I changed the inlet patch to remove any velocity to try and isolate the problem, in the actual situation I would use fixedValue for u and fixedFluxPressure for p for the inlet. p: Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [1 -1 -2 0 0 0 0];
internalField nonuniform List<scalar>
605000
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REDACTED);
boundaryField
{
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valueExpression "101325*pow((1-0.0065/288.15*pos().y),5.2561)";
evaluateDuringConstruction 0;
variables "";
timelines (
);
lookuptables (
);
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{
type symmetry;
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;
valueExpression "101325*pow((1-0.0065/288.15*pos().y),5.2561)";
evaluateDuringConstruction 0;
variables "";
timelines (
);
lookuptables (
);
lookuptables2D (
);
}
coldWalls
{
type zeroGradient;
}
hotWalls
{
type zeroGradient;
}
defaultFaces
{
type empty;
}
}
// ************************************************************************* //
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 0 0 1 0 0 0];
internalField nonuniform List<scalar>
605000
(
REDACTED
)
;
refGradient uniform 0;
valueFraction uniform 1;
value nonuniform List<scalar>
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;
valueExpression "288.15-0.0065*pos().y";
gradientExpression "0";
fractionExpression "1";
evaluateDuringConstruction 0;
variables "";
timelines (
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lookuptables (
);
lookuptables2D (
);
}
roof
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type symmetry;
}
outlet
{
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value nonuniform List<scalar>
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)
;
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100
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coldWalls
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type zeroGradient;
}
hotWalls
{
type zeroGradient;
}
defaultFaces
{
type empty;
}
}
// ************************************************************************* //
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: v1612+ |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
location "0";
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0 0);
boundaryField
{
inlet
{
type inletOutlet;
value uniform (0 0 0);
inletValue uniform (0 0 0);
}
roof
{
type symmetry;
}
outlet
{
type inletOutlet;
value uniform (0 0 0);
inletValue uniform (0 0 0);
}
coldWalls
{
type slip;
}
hotWalls
{
type slip;
}
defaultFaces
{
type empty;
}
}
// ************************************************************************* //
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: plus |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [1 -1 -2 0 0 0 0];
internalField uniform 101325;
boundaryField
{
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{
type fixedValue;
value nonuniform List<scalar>
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type symmetry;
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value nonuniform List<scalar>
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72816.2
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}
coldWalls
{
type fixedFluxPressure;
gradient uniform 0;
value uniform 101325;
}
hotWalls
{
type fixedFluxPressure;
gradient uniform 0;
value uniform 101325;
}
frontAndBack
{
type empty;
}
}
// ************************************************************************* //
cheers sturgeon |
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