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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 4 th , June, 2013 Bath, UK. Background.

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slide1

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

slide2

Background

Ocean waves: wind generated waves

Irregular waves

Intermediate and deep waters

Approximations

Regular waves: sine/ cosine function

slide3

Background

Wave motion: Wave amplitude/elevation Water depth Wave length

slide5

Background

  • Computational Fluid Dynamic (CFD): OpenFOAM
  • Open Source C++ library
  • Suitable for use in wide ranges of problems
slide6

Parallel processing capability of OpenFOAM

  • Default
  • Domain decomposition
  • openMPI
  • Terminal commands
      • decomposePar
      • mpirun--hostfile <machines> -np <nProcs>
  • <foamExec> <otherArgs> -parallel > log &
      • reconstructPar
slide7

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

slide8

Computational Cost (Multi-cores)

Cells: 15712120

Cores: 4 cores

Computational time: 5 days

Size of output files: 90GB

Cases: ?

Static mesh Dynamic mesh

slide9

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…..

slide10

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
slide11

Running in parallel (Aquila)

t = 5s

t = 10s

t = 15s

t = 20s

t = 25s

Green line : PC results, red line: Aquila results

slide12

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

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