Dr Hema Wadhwa

Dr Hema Wadhwa

The Rocks, New South Wales, Australia
3K followers 500+ connections

About

A thought leader, collaborator and an engineering specialist, with a demonstrated history…

Articles by Dr Hema

Activity

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Experience

  • Worley Graphic

    Worley

    Australia

  • -

    Perth, Western Australia, Australia

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    Australia

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    Perth, Western Australia, Australia

  • -

    Perth, Western Australia, Australia

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    Perth, Western Australia, Australia

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    Perth, Western Australia, Australia

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    Houston, Texas, United States

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    Perth, Western Australia, Australia

  • -

    Perth, Western Australia, Australia

  • -

    Perth, Western Australia, Australia

Education

Licenses & Certifications

Volunteer Experience

Publications

  • A Flexible Riser Digital Twin for Real-Time Structural Integrity Management

    Proceedings of the 26th Offshore Symposium, April 2021, Houston, Texas Texas Section of the Society of Naval Architects and Marine Engineers

    A real-time understanding of the structural integrity of flexible risers is critical to avoiding
    failures as well as unnecessary and costly replacements. Accurate and efficient computation of
    tensile armor wire stress time-histories is the key to enabling the implementation of a flexible
    riser digital twin. Accuracy requires capturing the nonlinear kinematics of the flexible’s helically
    contra-wound tensile armor layers and their interaction with the other metallic and…

    A real-time understanding of the structural integrity of flexible risers is critical to avoiding
    failures as well as unnecessary and costly replacements. Accurate and efficient computation of
    tensile armor wire stress time-histories is the key to enabling the implementation of a flexible
    riser digital twin. Accuracy requires capturing the nonlinear kinematics of the flexible’s helically
    contra-wound tensile armor layers and their interaction with the other metallic and thermoplastic layers in a dynamic simulation. While it is generally accepted that high-fidelity 3D finite
    element models best capture the complex kinematics required to produce accurate stresses, the
    main issue is that simulation time remains prohibitive, for example, a single bending cycle on
    modern day multi-core computers typically requires 24-48 hours. Therefore, any successful
    implementation of a flexible riser digital twin requires an accelerated solver capable of realtime computation of 1000s of bending cycle inputs into the high-fidelity finite element model.
    This paper demonstrates a flexible riser digital twin applications centered around the
    accelerated solver FLEXAS.

    Other authors
  • Collapse Simulations of an Accidentally Dropped Drill Riser

    Proceedings of 28th International Ocean and Polar Engineering Conference

    An accidentally dropped drill riser/blowout preventer (BOP) system can pose extreme and costly hazard to subsea facilities. High-fidelity multi-body nonlinear dynamic simulations are required to accurately predict the propagating axial compression waves along the riser due to BOP’s seabed impact, the evolution of the collapse of the riser, riser impact energies, the riser seabed layout, and the resulting impact zone to better manage risks.
    The nonlinear simulations must involve detailed…

    An accidentally dropped drill riser/blowout preventer (BOP) system can pose extreme and costly hazard to subsea facilities. High-fidelity multi-body nonlinear dynamic simulations are required to accurately predict the propagating axial compression waves along the riser due to BOP’s seabed impact, the evolution of the collapse of the riser, riser impact energies, the riser seabed layout, and the resulting impact zone to better manage risks.
    The nonlinear simulations must involve detailed finite element models (FEMs) to accurately capture the stiffness and mass distribution along the riser span, the asymmetrical bending stiffness/mass contribution and axial slip from the auxiliary lines, nonlinear behavior at the flex joint, and the flange/flange joint connections. These effects are critically important in the modeling the propagation of the compression waves that speed through the riser from the point of BOP impact and initiate the drill riser buckling and post-buckling dynamics/collapse.
    To incorporate detailed FEM and at the same time maintain computational efficiency and accuracy, nonlinear dynamic substructuring (NDS) is utilized. NDS extends the frame work of dynamic substructuring to nonlinear problems enabling highly efficient multibody nonlinear system level simulations while maintaining the accuracy of individual FEM components. The multi-body NDS solver utilized for efficient computation of this large-order multi-physics problem enables the coupling of four physical models: (i) nonlinear dynamics, (ii) hydrodynamics, (iii) flexible body dynamics, and (iv) multi-body dynamics.
    The simulations demonstrate that for this drill riser configuration, the top unbuoyed sections play a key role in the collapse process of the drill riser. The seabed impact zone and impact energies to assess potential impact with seabed infrastructure are discussed.

    Other authors
    • Brad Skinner
    • Arya Majed
  • Effect of porosity on the hydrodynamic behaviour of oscillating structures during lifting operations

    Proceedings of 3rd Marine Heavy Transport and Lift Conference

  • Variation of heave added mass and damping near seabed

    Proceedings of 29th International Conference on Ocean and Arctic Engineering

    Other authors
    • K Thiagarajan
  • Hydrodynamic forces on an oscillating disk under a free surface

    Proceedings of 9th Engineering Mathematics and Applications Conference

    Other authors
    • K Thiagarajan
  • Experimental assessments of hydrodynamic coefficients of disks oscillating near a free surface

    Proceedings of 28th International Conference on Ocean and Arctic Engineering

    Other authors
    • K Thiagarajan
  • Evaluation of added mass coefficients using Landweber’s method of conformal mapping

    XXII International Congress of Theoretical and Applied Mechanics

    Other authors
    • K Thiagarajan
  • Experimental Visualization of flow induced by solid and porous oscillating disks

    8th International symposium on Particle Image Velocimetry

    Other authors
    • K Thiagarajan
  • Comparison of added mass coefficients for a floating tanker evaluated by conformal mapping and boundary element methods

    Australasian Fluid Mechanics conference 2007

    Other authors
    • K Thiagarajan

Courses

  • Leading for Results

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Projects

  • FPSO Mooring Analysis (Detailed Design)

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    Part of a small team of naval architects and riser engineers performing mooring reanalysis on a disconnectable turret moored FPSO. Mooring analysis was performed using Ariane for the connected FPSO condition and OrcaFlex for the disconnected turret condition.

    Other creators

Honors & Awards

  • Superstar of STEM

    Science & Technology Australia

  • Corporate Legend Finalist 2024

    Australian Professionals of Colour

  • WA Women Hall of Fame STEM Inductee 2023

    WA Womem Hall of Fame

  • WiTWA Tech [+] 20 Award

    Women in Technology Western Australia

    https://www.linkedin.com/feed/update/urn:li:activity:6865876498440695808/

  • Chief Executive Women STEM Scholarship

    Chief Executive Women (CEW)

    https://www.linkedin.com/feed/update/urn:li:activity:6845886187392110592/

  • Best Technical Paper Award

    Society of Naval Architects and Marine Engineers, Texas

    Technical Publication on Digital Twins of Flexible Risers (Co-authored)
    https://www.linkedin.com/feed/update/urn:li:activity:6798825536882905088/

  • Women in Leadership NAARI AWARD

    Indian Society of Western Australia

  • Top 25 professional migrant in Australia

    APA Magazine

  • Above and Beyond Award

    Nick Brown, Operations Director (ANZ) INTECSEA WorleyParsons Group

  • Student Travel Award

    The University of Western Australia

  • Ad Hoc Postgraduate Scholarship

    The University of Western Australia

  • UWA Completion Scholarship

    The University of Western Australia

  • Scholarship for International Research Fees

    The University of Western Australia

  • University International Stipend

    The University of Western Australia

  • 2010 University International Stripend-Top Up Scholarship

    The University of Western Australia

  • Ad Hoc Top Up Scholarship

    The University of Western Australia

  • Ad Hoc Postgraduate Scholarship

    The University of Western Australia

Organizations

  • Society for Underwater Technology

    Elected Committee member 2018

    - Present

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