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ENH: lagrangian injection - exposed minimum number of particles per parcel. See #728

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The minimum number of particles per parcel can now be set in the
injection model input, e.g.:

    model1
    {
        type            ...;
        massTotal       ...;
        parcelBasisType ...;
        minParticlesPerParcel 1; <-- new optional entry
        SOI             ...;
        ...

Uses a value of 1 by default if the entry is not present.  The value of
1 is generally recommended and beneficial for coupled cases where small
time steps can lead to the injection of too many parcels and subsequently
greatly over-predict the particle source contributions (momentum, heat,
mass transfer etc)
This commit is contained in:
Andrew Heather 2018-02-23 12:00:14 +00:00
parent ac3a8bc3cb
commit 4d4c5910ed
2 changed files with 18 additions and 7 deletions
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11
src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.C
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
\\/ M anipulation | Copyright (C) 2016 OpenCFD Ltd.
\\/ M anipulation | Copyright (C) 2016-2018 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -275,6 +275,7 @@ Foam::InjectionModel<CloudType>::InjectionModel(CloudType& owner)
nParticleFixed_(0.0),
time0_(0.0),
timeStep0_(this->template getModelProperty<scalar>("timeStep0")),
minParticlesPerParcel_(1),
delayedVolume_(0.0),
injectorID_(-1)
{}
@ -304,6 +305,11 @@ Foam::InjectionModel<CloudType>::InjectionModel
nParticleFixed_(0.0),
time0_(owner.db().time().value()),
timeStep0_(this->template getModelProperty<scalar>("timeStep0")),
minParticlesPerParcel_
(
this->coeffDict().template
lookupOrDefault<scalar>("minParticlesPerParcel", 1)
),
delayedVolume_(0.0),
injectorID_(this->coeffDict().lookupOrDefault("injectorID", -1))
{
@ -382,6 +388,7 @@ Foam::InjectionModel<CloudType>::InjectionModel
nParticleFixed_(im.nParticleFixed_),
time0_(im.time0_),
timeStep0_(im.timeStep0_),
minParticlesPerParcel_(im.minParticlesPerParcel_),
delayedVolume_(im.delayedVolume_),
injectorID_(im.injectorID_)
{}
@ -517,7 +524,7 @@ void Foam::InjectionModel<CloudType>::inject
pPtr->rho()
);
if (pPtr->nParticle() >= 1.0)
if (pPtr->nParticle() >= minParticlesPerParcel_)
{
parcelsAdded++;
massAdded += pPtr->nParticle()*pPtr->mass();

14
src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/InjectionModel/InjectionModel.H
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
\\/ M anipulation |
\\/ M anipulation | Copyright (C) 2018 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -81,7 +81,7 @@ public:
// Enumerations
//- Parcel basis representation options
// i.e constant number of particles OR constant mass per parcel
//- i.e constant number of particles OR constant mass per parcel
enum parcelBasis
{
pbNumber,
@ -100,7 +100,7 @@ protected:
scalar SOI_;
//- Total volume of particles introduced by this injector [m^3]
// - scaled to ensure massTotal is achieved
//- Note: scaled to ensure massTotal is achieved
scalar volumeTotal_;
//- Total mass to inject [kg]
@ -128,7 +128,7 @@ protected:
parcelBasis parcelBasis_;
//- nParticle to assign to parcels when the 'fixed' basis
// is selected
//- is selected
scalar nParticleFixed_;
//- Continuous phase time at start of injection time step [s]
@ -137,8 +137,12 @@ protected:
//- Time at start of injection time step [s]
scalar timeStep0_;
//- Minimum number of particles used to represent each parcel
//- default = 1
scalar minParticlesPerParcel_;
//- Volume that should have been injected, but would lead to
// less than 1 particle per parcel
//- less than minParticlesPerParcel_ particle per parcel
scalar delayedVolume_;
//- Optional injector ID