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Use of OpenFOAM in Modelling of wave-structure interactions PowerPoint PPT Presentation


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Use of OpenFOAM in Modelling of wave-structure interactions. Lifen Chen Supervisors: Dr JunZang , Dr Andrew Hillis , Prof Andrew Plummer Architecture and Civil Engineering department University of Bath [email protected] Bath HPC symposium 4 th , June, 2013 Bath, UK. Background.

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Use of OpenFOAM in Modelling of wave-structure interactions

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Use of openfoam in modelling of wave structure interactions

Use of OpenFOAM in Modelling of wave-structure interactions

Lifen Chen

Supervisors: Dr JunZang, Dr Andrew Hillis, Prof Andrew Plummer

Architecture and Civil Engineering department

University of Bath

[email protected]

Bath HPC symposium

4th, June, 2013

Bath, UK


Use of openfoam in modelling of wave structure interactions

Background

Ocean waves: wind generated waves

Irregular waves

Intermediate and deep waters

Approximations

Regular waves: sine/ cosine function


Use of openfoam in modelling of wave structure interactions

Background

Wave motion: Wave amplitude/elevation Water depth Wave length


Use of openfoam in modelling of wave structure interactions

Background


Use of openfoam in modelling of wave structure interactions

Background

  • Computational Fluid Dynamic (CFD): OpenFOAM

  • Open Source C++ library

  • Suitable for use in wide ranges of problems


Use of openfoam in modelling of wave structure interactions

Parallel processing capability of OpenFOAM

  • Default

  • Domain decomposition

  • openMPI

  • Terminal commands

    • decomposePar

    • mpirun--hostfile <machines> -np <nProcs>

  • <foamExec> <otherArgs> -parallel > log &

    • reconstructPar


  • Use of openfoam in modelling of wave structure interactions

    Cases

    Computational domain:

    30m × 2m × 1.01m

    (half domain)

    8 cases: various wave parameters

    Zang, J. and Taylor, P. H etal.(2010)

    Steep wave and breaking wave impact on offshore wind turbine foundations—ringing revisited

    25th IWWWFB, China


    Use of openfoam in modelling of wave structure interactions

    Computational Cost (Multi-cores)

    Cells: 15712120

    Cores: 4 cores

    Computational time: 5 days

    Size of output files: 90GB

    Cases: ?

    Static mesh Dynamic mesh


    Use of openfoam in modelling of wave structure interactions

    Results

    Has been applied in ocean engineering successfully.

    Can predict wave loading on the fixed structure correctly.

    In adaptions of the source code…

    A series of trials:

    Boundary conditions

    mesh type and resolution

    wave parameters…..


    Use of openfoam in modelling of wave structure interactions

    Running in parallel (Aquila)

    • OpenFOAM-2.1.0 vs. OpenFOAM-1.5

    PC vs. Aquila

    • testing

    • Boundary conditions:

      • attempted: totoalPressure for output boundary

    • PC: stable Aquila: dump after 7s

      • modified to: zeroGradient

      • PC: stable Aquila: stable

    • 2. Running the case

    • PC: 4 cores Aquila: 4 processors


    Use of openfoam in modelling of wave structure interactions

    Running in parallel (Aquila)

    t = 5s

    t = 10s

    t = 15s

    t = 20s

    t = 25s

    Green line : PC results, red line: Aquila results


    Use of openfoam in modelling of wave structure interactions

    Future work

    • Simulation interactions between waves and floating bodies.

    • dynamic mesh

    • Simulation interactions between waves and real WECs.

    • complex geometries and structures’ shape

    Increase computational cost


    Use of openfoam in modelling of wave structure interactions

    Thank you!


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