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Implement nonlinear stability functions #77

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Implement nonlinear stability functions #77

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b77787d
implement nonlinear Beljaars functions in the fixedheatingrate B.C.
Apr 5, 2021
7ab91d9
fixed nonlinear flag
Apr 5, 2021
2f85260
Print coeffs for nonlinear path
ewquon Apr 5, 2021
52c0cc6
Merge pull request #1 from ewquon/Beljaars
mdebnath1 Apr 5, 2021
e8ed6f6
Updated the coefficients and temperature stability function
Apr 6, 2021
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67 changes: 59 additions & 8 deletions ...elds/derived/surfaceTemperatureFluxModels/fixedHeatingRate/fixedHeatingRateFvPatchField.C
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,11 @@ fixedHeatingRateFvPatchField
betaH_(9.0),
gammaH_(4.7),
alphaH_(0.74),
a_(1),
b_(0.667),
c_(5.0),
d_(0.35),
nonlinear_(false),
averageType_("local"),
tLast_(db().time().timeOutputValue())
{}
Expand All @@ -79,6 +84,11 @@ fixedHeatingRateFvPatchField
betaH_(ptf.betaH_),
gammaH_(ptf.gammaH_),
alphaH_(ptf.alphaH_),
a_(ptf.a_),
b_(ptf.b_),
c_(ptf.c_),
d_(ptf.d_),
nonlinear_(ptf.nonlinear_),
averageType_(ptf.averageType_),
tLast_(ptf.tLast_)
{}
Expand All @@ -102,9 +112,23 @@ fixedHeatingRateFvPatchField
betaH_(readScalar(dict.lookup("betaH"))),
gammaH_(readScalar(dict.lookup("gammaH"))),
alphaH_(readScalar(dict.lookup("alphaH"))),
a_(dict.lookupOrDefault<scalar>("a",1.0)),
b_(dict.lookupOrDefault<scalar>("b",0.667)),
c_(dict.lookupOrDefault<scalar>("c",5.0)),
d_(dict.lookupOrDefault<scalar>("d",0.35)),
nonlinear_(dict.lookupOrDefault<bool>("nonlinear",false)),
averageType_(dict.lookupOrDefault<word>("averageType","local")),
tLast_(db().time().timeOutputValue())
{}
{
if (nonlinear_)
{
Info<< "Using nonlinear Beljaars functions with:" << endl
<< tab << "a = " << a_ << endl
<< tab << "b = " << b_ << endl
<< tab << "c = " << c_ << endl
<< tab << "d = " << d_ << endl;
}
}


fixedHeatingRateFvPatchField::
Expand All @@ -123,6 +147,11 @@ fixedHeatingRateFvPatchField
betaH_(wfpf.betaH_),
gammaH_(wfpf.gammaH_),
alphaH_(wfpf.alphaH_),
a_(wfpf.a_),
b_(wfpf.b_),
c_(wfpf.c_),
d_(wfpf.d_),
nonlinear_(wfpf.nonlinear_),
averageType_(wfpf.averageType_),
tLast_(wfpf.tLast_)
{}
Expand All @@ -145,6 +174,11 @@ fixedHeatingRateFvPatchField
betaH_(wfpf.betaH_),
gammaH_(wfpf.gammaH_),
alphaH_(wfpf.alphaH_),
a_(wfpf.a_),
b_(wfpf.b_),
c_(wfpf.c_),
d_(wfpf.d_),
nonlinear_(wfpf.nonlinear_),
averageType_(wfpf.averageType_),
tLast_(wfpf.tLast_)
{}
Expand Down Expand Up @@ -708,11 +742,19 @@ void fixedHeatingRateFvPatchField::qwEvaluate
// form the "zeta" variable, which is z/L
scalar zeta0 = z1/L0;

// form psiM
scalar psiM0 = -gammaM * zeta0;

// form psiH
scalar psiH0 = -gammaH * zeta0;
// form psiM, psiH
scalar psiM0;
scalar psiH0;
if (nonlinear_)
{
psiM0 = -a_*zeta0 - b_*(zeta0-c_/d_)*Foam::exp(-d_*zeta0) - b_*c_/d_;
psiH0 = 1-Foam::pow((1+0.667*a_*zeta0),1.5) - b_*(zeta0-c_/d_)*Foam::exp(-d_*zeta0)-b_*c_/d_;
}
else
{
psiM0 = -gammaM * zeta0;
psiH0 = -gammaH * zeta0;
}

// update u*
scalar uStarOld = uStar0;
Expand All @@ -730,8 +772,17 @@ void fixedHeatingRateFvPatchField::qwEvaluate
qw = qw0;
uStar = uStar0;
L = L0;
phiM = 1.0 + (gammaM * zeta0);
phiH = alphaH + (gammaH * zeta0);
if (nonlinear_)
{
// non dimensional wind and temperature profiles from Beljaars 1991
phiM = 1.0 + (zeta0*(a_+b_*Foam::exp(-d_*zeta0)*(1+c_-d_*zeta0)));
phiH = 1 + zeta0*(a_*Foam::pow((1+0.6667*a_*zeta0),0.5))+ zeta0*(b_*Foam::exp(-d_*zeta0))*(1+c_-d_*zeta0);
}
else
{
phiM = 1.0 + (gammaM * zeta0);
phiH = alphaH + (gammaH * zeta0);
}

} while (((mag(uStarDiff) > tol) || (mag(qwDiff) > tol)) && (iter < iterMax-1));

Expand Down
9 changes: 9 additions & 0 deletions ...elds/derived/surfaceTemperatureFluxModels/fixedHeatingRate/fixedHeatingRateFvPatchField.H
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,15 @@ private:

// -Constant for Monin-Obuhkov temperature scalaing law
scalar alphaH_;

// Constants for Beljaars equation
scalar a_;
scalar b_;
scalar c_;
scalar d_;

// Turn on nonlinear Beljaars stability functions
bool nonlinear_;

// -Type of application of Monin-Obuhkov scaling, local or nonlocal
word averageType_;
Expand Down