TestPhicau

IHFOAM is a set of solvers and boundary conditions to generate and absorb water waves actively at the boundaries and to simulate their interaction with porous coastal structures.

The main scope of these modelling tools is coastal, marine, hydraulic and offshore engineering.

1 IHFOAM Overview

The IHFOAM package includes:

• Individual boundary conditions for wave generation and active wave absorption for alpha1 and U fields. (libIHwaveGeneration.so)
  • IH_Waves_InletAlpha
  • IH_Waves_InletVelocity
• Boundary conditions for pure wave absorption applicable to U field. Based on 2D or 3D theories, both are applicable to 3D cases. (libIHwaveAbsorption.so)
  • IH_3D_3DAbsorption_InletVelocity
  • IH_3D_2DAbsorption_InletVelocity
• Solvers to be used with your favourite version of OpenFOAM or FOAM-extend. See compatibility below.
  • ihFoam
  • ihDyMFoam
• Brief reference manual
• Tutorials and validation cases

1.1 About IHFOAM solvers

ihFoam and ihDyMFoam solve two-phase incompressible flows within porous media by means of the VARANS (Volume-Averaged Reynolds-Averaged Navier-Stokes) equations. More information will be added, in the mean time check the references.

Both solvers are derived from interFoam and interDyMFoam. Furthermore, outside the porous media, the VARANS equations are identical to the classic RANS. Therefore, ihFoam and ihDyMFoam can be used instead of interFoam and interDyMFoam even when the case presents no porous zones.

1.2 Supported Versions

Valid versions:

Known issues:

• everything works when you compile this version from source, as there is a problem with the precompiled installable pack. Reference [1].
  • Otherwise:
    • The solvers (even the regular version of interFoam) need to include "-linterfaceProperties" to compile.
    • IHFOAM solvers compile and work. Despite the BCs being included, apparently they are not linked, as they are not recognized.
    • If the boundary conditions are included dynamically in controlDict and used with the IHFOAM solvers, turbulence modelling does not work.

• the boundary conditions compile and work.
  • No IHFOAM solver is included, as we are experiencing severe problems with pressure calculations (not linked in any way to IHFOAM implementation) in this version. We are preparing an extensive bug report for the OpenFOAM developers. In the mean time we suggest you stay with prior OpenFOAM versions.
  • Should you want to use wave generation and absorption, see below how to link the boundary conditions dynamically in controlDict.

1.3 Ongoing Development

• The current version is 2.0, as released in 15th July 2014.
• Bug fixes will be issued on a regular basis, while the development of version 3.0 is currently ongoing.
• The new version will include major changes in the structure of the boundary conditions, which will not affect the use.

Future releases will include:

• Volume-averaged turbulence models, as seen in the third paper.
• Current generation (already pre-implemented but not referenced, as it needs further work and validation).
• Wave theories implemented as classes, gathered by an autoPtr.

Future releases may include:

• Custom IHdynamicRefineFvMesh to enable dynamic mesh refinement on snappyHexMesh-generated meshes, as seen in the fourth paper.
• Custom boundary condition to generate waves using moving boundaries, as presented in OFW9.

1.4 References and Citing

IHFOAM is a product developed in the frame of a Master and PhD Thesis at the Environmental Hydraulics Institute "IH Cantabria" of the University of Cantabria. The implementation and validation details are published in the following references:

First paper

Realistic wave generation and active wave absorption for Navier-Stokes models: Application to OpenFOAM.
Higuera, P., Lara, J.L. and Losada, I.J. (2013)
Coastal Engineering, Vol. 71, pp. 102-118.

Second paper

Simulating coastal engineering processes with OpenFOAM.
Higuera, P., Lara, J.L. and Losada, I.J. (2013)
Coastal Engineering, Vol. 71, pp. 119-134.

Third paper

Three-dimensional interaction of waves and porous coastal structures using OpenFOAM. Part I: Formulation and validation.
Higuera, P., Lara, J.L. and Losada, I.J. (2014)
Coastal Engineering, Vol. 83, pp. 243-258

Fourth paper

Three-dimensional interaction of waves and porous coastal structures using OpenFOAM. Part II: Application.
Higuera, P., Lara, J.L. and Losada, I.J. (2014)
Coastal Engineering, Vol. 83, pp. 243-258

1.5 Get Connected

To submit your feedback, suggestions, bugs... you have many options:

• The IHFOAM mail, found here.
• The IHFOAM LinkedIn group.
• At cfd-online forum, username Phicau.

IHFOAM at cfd-online

• IHFOAM Release Thread ---- CREATE and LINK
• IHFOAM Support Thread ---- CREATE and LINK

You can be informed and get all the latest news by joining our mailing list ---- LINK

2 Source Download and Compilation

IHFOAM download site can be found here.

2.1 Source Code Download

You can find IHFOAM in GitHub

To download the source code run the following command:

git clone git://github.com/phicau/IHFOAM.git

Code updates can be downloaded in the future as follows:

git checkout
git pull

2.2 Source Code Structure

IHFOAM source code is divided in two main folders:

• genAbs --> Generation and absorption boundary conditions
  • waveAbsorption --> (BCs)
  • waveGeneration --> (BCs)
  • common --> Scripts shared by both BCs
• solvers --> Guess what's inside...
  • ihFoamXXXXX --> One for each compatible version, including ihFoam and ihDyMFoam

2.3 Compilation

Compilation has been automatized and needs to be performed only once. Since IHFOAM does not need any dependencies, the source code can be downloaded and compiled anywhere on your computer.

• First compile the boundary conditions:

cd genAbs
./allMake

The script will figure out which version of OpenFOAM or FOAM-extend you are running and set a convenient preprocessor statement to adjust the code automatically to each flavour/version.

• Second compile the solvers: ihFoam and ihDyMFoam

cd solvers/ihFoamXXXXX
./allMake

Where XXXXX denotes your flavour (OpenFOAM - OF, FOAM-extend - FE) and your version. The currently supported versions have already been shown.

2.4 Dynamic Linking of the Boundary Conditions

In order to include the wave generation and active wave absorption boundary conditions without needing to re-compile a solver, write the following code in controlDict:

libs
(
    "libIHwaveGeneration.so"
    "libIHwaveAbsorption.so"
);

3 IHFOAM Usage

IMPORTANT NOTES:

• IHFOAM is programmed in such a way that gravity has to act in the negative Z direction.
• Currently the X and Y coordinates of each boundary face are substituted by those of the centroid of the paddle to which the face belongs (similarly to what happens in the laboratory). Therefore, to obtain accurate directionality you need several paddles (nPaddles >> 1). Next releases will change the implementation so you can choose.

3.1 Wave Generation BCs

To generate waves you have to set the following boundary conditions.

For alpha1:

    inlet
    {
        type            IH_Waves_InletAlpha;
        waveDictName    IHWavesDict;
        value           uniform 0;
    }

For U:

    inlet
    {
        type            IH_Waves_InletVelocity;
        waveDictName    IHWavesDict;
        value           uniform (0 0 0);
    }

3.1.1 Wave Generation Dictionary

Wave generation dictionary options

• The wave conditions are read from a dictionary file located in the constant folder.
• By default it is named IHWavesDict, however, you can name it differently as long as you set waveDictName correctly.
• This way you can even specify several different wave conditions for different patches on your case.

Implemented wave theories:

waveType / waveTheory	Reference	Comments
regular / StokesI	Dean and Dalrymple (1991)
regular / StokesII	Dean and Dalrymple (1991)
regular / StokesV	Skjelbreia and Hendrickson (1960)
regular / cnoidal	Svendsen (2006)
regular / streamfunction	Fenton (1988)	No solver programmed. Use Fenton's Fourier solver (old version tested only, distributed with the materials)
solitary / Boussinesq	Lee et al. (1982)
wavemaker / (tx/tv/txeta/tveta)	Own development	waveTheory depending what you provide: t (time series), x (paddle displacent), eta (free surface elevation). Note that this BC replicates the wavemaker (constant) profile, but it does not move.
irregular / ()	Dean and Dalrymple (1991)	Linear summation of StokesI components. Second order by Longuet-Higgins and Stewart (1960) completed with Baldock et al. (1996)

3.2 Wave Absorption BCs

To absorb waves you have to set the following boundary condition for U.

2D-theory version:

    outlet
    {
        type            IH_3D_2DAbsorption_InletVelocity;;
        nPaddles        1;
        nEdgeMin        0;
        nEdgeMax        0;
        absorptionDir   400;
        value           uniform (0 0 0);
    }

3D-theory version:

    outlet
    {
        type            IH_3D_3DAbsorption_InletVelocity;;
        nPaddles        1;
        nEdgeMin        0;
        nEdgeMax        0;
        value           uniform (0 0 0);
    }

4 IHFOAM Documentation and Tutorials

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