ENH: adding non-dimensional option to fanFvPatchField.C
This commit is contained in:
sergio
Mark Olesen
parent
ad00fed4aa
commit
219c520f0b
@ -3,7 +3,7 @@
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2015 OpenFOAM Foundation
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\\/ M anipulation |
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\\/ M anipulation | Copyright (C) 2017 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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@ -49,7 +49,10 @@ Foam::fanFvPatchField<Type>::fanFvPatchField
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uniformJumpFvPatchField<Type>(p, iF),
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phiName_("phi"),
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rhoName_("rho"),
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uniformJump_(false)
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uniformJump_(false),
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nonDimensional_(false),
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rpm_(0.0),
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dm_(0.0)
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{}
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@ -64,8 +67,17 @@ Foam::fanFvPatchField<Type>::fanFvPatchField
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uniformJumpFvPatchField<Type>(p, iF, dict),
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phiName_(dict.lookupOrDefault<word>("phi", "phi")),
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rhoName_(dict.lookupOrDefault<word>("rho", "rho")),
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uniformJump_(dict.lookupOrDefault<bool>("uniformJump", false))
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{}
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uniformJump_(dict.lookupOrDefault<bool>("uniformJump", false)),
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nonDimensional_(dict.lookupOrDefault<Switch>("nonDimensional", false)),
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rpm_(dict.lookupOrDefault<scalar>("rpm", 0.0)),
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dm_(dict.lookupOrDefault<scalar>("dm", 0.0))
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{
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if (nonDimensional_)
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{
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dict.lookup("rpm") >> rpm_;
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dict.lookup("dm") >> dm_;
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}
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}
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template<class Type>
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@ -80,7 +92,10 @@ Foam::fanFvPatchField<Type>::fanFvPatchField
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uniformJumpFvPatchField<Type>(ptf, p, iF, mapper),
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phiName_(ptf.phiName_),
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rhoName_(ptf.rhoName_),
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uniformJump_(ptf.uniformJump_)
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uniformJump_(ptf.uniformJump_),
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nonDimensional_(ptf.nonDimensional_),
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rpm_(ptf.rpm_),
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dm_(ptf.dm_)
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{}
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@ -93,7 +108,10 @@ Foam::fanFvPatchField<Type>::fanFvPatchField
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uniformJumpFvPatchField<Type>(ptf),
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phiName_(ptf.phiName_),
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rhoName_(ptf.rhoName_),
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uniformJump_(ptf.uniformJump_)
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uniformJump_(ptf.uniformJump_),
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nonDimensional_(ptf.nonDimensional_),
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rpm_(ptf.rpm_),
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dm_(ptf.dm_)
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{}
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@ -107,7 +125,10 @@ Foam::fanFvPatchField<Type>::fanFvPatchField
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uniformJumpFvPatchField<Type>(ptf, iF),
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phiName_(ptf.phiName_),
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rhoName_(ptf.rhoName_),
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uniformJump_(ptf.uniformJump_)
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uniformJump_(ptf.uniformJump_),
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nonDimensional_(ptf.nonDimensional_),
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rpm_(ptf.rpm_),
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dm_(ptf.dm_)
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{}
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@ -138,6 +159,12 @@ void Foam::fanFvPatchField<Type>::write(Ostream& os) const
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(
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os, "uniformJump", false, uniformJump_
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);
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this->template writeEntryIfDifferent<bool>
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(
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os, "nonDimensional", false, nonDimensional_
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);
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this->template writeEntryIfDifferent<scalar>(os, "rpm", 0, rpm_);
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this->template writeEntryIfDifferent<scalar>(os, "dm", 0, dm_);
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}
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@ -3,7 +3,7 @@
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2016 OpenFOAM Foundation
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\\/ M anipulation |
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\\/ M anipulation | Copyright (C) 2017 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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@ -34,6 +34,24 @@ Description
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The jump is specified as a \c Function1 type, to enable the use of, e.g.
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contant, polynomial, table values.
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The switch nonDimensional can be used for a non-dimensional table. It needs
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inputs rpm and dm of the fan. It should be used with uniformJump true.
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The nonDimensional flux for the table is calculate as :
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phi = 4.0*mDot/(rho*sqr(PI)*dm^3*omega)
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where:
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dm is the mean diameter.
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omega is rad/sec.
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The nonDimensinal pressure :
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Psi = 2 deltaP/(rho*(sqr(PI*omega*dm)))
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where:
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deltaP is the pressure drop
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The non-dimensional table should be given as Psi = F(phi).
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Usage
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\table
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Property | Description | Required | Default value
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@ -43,6 +61,9 @@ Usage
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rho | density field name | no | none
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uniformJump | applies a uniform pressure based on the averaged
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velocity | no | false
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nonDimensional | uses non-dimensional table | no | false
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rpm | fan rpm for non-dimensional table | no | 0.0
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dm | mean diameter for non-dimensional table | no | 0.0
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\endtable
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Example of the boundary condition specification:
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@ -114,6 +135,17 @@ class fanFvPatchField
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//- Uniform pressure drop
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bool uniformJump_;
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//- Swtich for using non-dimensional curve
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Switch nonDimensional_;
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// Parameters for non-dimensional table
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//- Fan rpm
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scalar rpm_;
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//- Fan mean diameter
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scalar dm_;
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// Private Member Functions
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@ -3,7 +3,7 @@
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
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\\/ M anipulation |
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\\/ M anipulation | Copyright (C) 2017 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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@ -48,6 +48,15 @@ void Foam::fanFvPatchField<Foam::scalar>::calcFanJump()
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{
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scalar area = gSum(patch().magSf());
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Un = gSum(Un*patch().magSf())/area;
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if (nonDimensional_)
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{
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// Create an adimensional volumetric flow rate
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Un =
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120.0*Un/pow3(constant::mathematical::pi)
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* patch().magSf()
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/ pow3(dm_);
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}
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}
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if (phi.dimensions() == dimDensity*dimVelocity*dimArea)
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@ -55,9 +64,20 @@ void Foam::fanFvPatchField<Foam::scalar>::calcFanJump()
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Un /= patch().lookupPatchField<volScalarField, scalar>(rhoName_);
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}
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if (nonDimensional_)
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{
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scalarField deltap = this->jumpTable_->value(Un);
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// Convert adimensional deltap from curve into deltaP
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scalarField pdFan =
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deltap*pow4(constant::mathematical::pi)*rpm_*sqr(dm_)/1800;
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this->jump_ = max(pdFan, scalar(0));
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}
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else
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{
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this->jump_ = max(this->jumpTable_->value(Un), scalar(0));
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}
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}
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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@ -73,7 +93,10 @@ Foam::fanFvPatchField<Foam::scalar>::fanFvPatchField
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uniformJumpFvPatchField<scalar>(p, iF),
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phiName_(dict.lookupOrDefault<word>("phi", "phi")),
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rhoName_(dict.lookupOrDefault<word>("rho", "rho")),
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uniformJump_(dict.lookupOrDefault<bool>("uniformJump", false))
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uniformJump_(dict.lookupOrDefault<bool>("uniformJump", false)),
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nonDimensional_(dict.lookupOrDefault<Switch>("nonDimensional", false)),
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rpm_(dict.lookupOrDefault<scalar>("rpm", 0.0)),
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dm_(dict.lookupOrDefault<scalar>("dm", 0.0))
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{
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if (this->cyclicPatch().owner())
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{
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