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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

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


Background

Ocean waves: wind generated waves

Irregular waves

Intermediate and deep waters

Approximations

Regular waves: sine/ cosine function


Background

Wave motion: Wave amplitude/elevation Water depth Wave length


Background


Background

  • Computational Fluid Dynamic (CFD): OpenFOAM

  • Open Source C++ library

  • Suitable for use in wide ranges of problems


Parallel processing capability of OpenFOAM

  • Default

  • Domain decomposition

  • openMPI

  • Terminal commands

    • decomposePar

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

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

    • reconstructPar


  • 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


    Computational Cost (Multi-cores)

    Cells: 15712120

    Cores: 4 cores

    Computational time: 5 days

    Size of output files: 90GB

    Cases: ?

    Static mesh Dynamic mesh


    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…..


    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


    Running in parallel (Aquila)

    t = 5s

    t = 10s

    t = 15s

    t = 20s

    t = 25s

    Green line : PC results, red line: Aquila results


    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


    Thank you!


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