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6cb7e80d7d
- If applied:
This commit allows the user to compute:
- the Lamb vector (https://en.wikipedia.org/wiki/Lamb_vector),
- on-the-fly or via postProcess utility
- for a given volVectorField (one per functionObject entry)
- Why:
The motivation is the literature-reported quantitative connection
between the Lamb vector (divergence) and the spatially localised
instantaneous fluid motions, e.g. high- and low-momentum fluid
parcels, which possess considerable level of capacity to affect
the rate of change of momentum, and to generate forces such as drag.
- Verification:
- Smooth-wall plane channel flow case (Moser et al. 1999) by
# Curtis et al. (2008) On the Lamb vector divergence
in Navier–Stokes flows, doi:10.1017/S0022112008002760
- What's next:
- The verification-show case
- Extended code guide entry titled "Lamb vector"
122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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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) 2019 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::functionObjects::lambVector
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Group
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grpFieldFunctionObjects
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Description
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Calculates Lamb vector, i.e. the cross product of vorticity and velocity.
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Calculation of the divergence of the Lamb vector can be performed by using
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'div' functionObject on this 'lambVector' functionObject.
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The field is stored on the mesh database so that it can be retrieved
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and used for other applications.
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Usage
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\verbatim
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lambVector1
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{
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type lambVector;
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libs ("libfieldFunctionObjects.so");
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field UMean;
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... Base options of fieldExpression ...
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}
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\endverbatim
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Where the entries comprise:
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\table
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Property | Description | Required | Default value
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type | Type name: lambVector | yes |
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field | Name of volVectorField | no | U
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\endtable
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See also
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Foam::functionObjects::fieldExpression
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SourceFiles
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lambVector.C
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\*---------------------------------------------------------------------------*/
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#ifndef functionObjects_lambVector_H
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#define functionObjects_lambVector_H
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#include "fieldExpression.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace functionObjects
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{
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/*---------------------------------------------------------------------------*\
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Class lambVector Declaration
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\*---------------------------------------------------------------------------*/
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class lambVector
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:
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public fieldExpression
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{
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// Private Member Functions
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//- Calculate the lambVector field and return true if successful
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virtual bool calc();
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public:
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//- Runtime type information
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TypeName("lambVector");
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// Constructors
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//- Construct from Time and dictionary
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lambVector
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(
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const word& name,
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const Time& runTime,
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const dictionary& dict
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);
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//- Destructor
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virtual ~lambVector() = default;
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace functionObjects
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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