Dr John OSullivan

Research | Current

My present research focus is computational fluid dynamics for environmental flows. Currently I am working in two main areas. The first is modelling flow through porous media and its application to geothermal reservoirs. This includes: improving geothermal reservoir models by including geological structural information; inverse modelling to assist with geothermal model calibration and enable uncertainty analysis of geothermal reservoir models; and using scripting and parallelisation to control large and complex models.

The second is modelling turbulent wind flow. This includes: developing accurate RANS closures for use with atmospheric flows; wall functions and other near wall treatments that can be used to simulate rough terrain; and simulation techniques for large, parallelised models.

Areas of expertise

My present research focus is computational fluid dynamics for environmental flows. Currently I am working in two main areas. The first is modelling flow through porous media and its application to geothermal reservoirs. This includes: improving geothermal reservoir models by including geological structural information; inverse modelling to assist with geothermal model calibration and enable uncertainty analysis of geothermal reservoir models; and using scripting and parallelisation to control large and complex models.

The second is modelling turbulent wind flow. This includes: developing accurate RANS closures for use with atmospheric flows; wall functions and other near wall treatments that can be used to simulate rough terrain; and simulation techniques for large, parallelised models.

Selected publications and creative works (Research Outputs)

  • Bjarkason, E. K., Maclaren, O. J., O'Sullivan JP, & O'Sullivan MJ (2018). Randomized Truncated SVD Levenberg-Marquardt Approach to Geothermal Natural State and History Matching. Water Resources Research, 54 (3), 2376-2404. 10.1002/2017WR021870
    Other University of Auckland co-authors: Oliver Maclaren, Michael OSullivan
  • Ratouis, T. M. P., O’Sullivan MJ, Alcaraz, S. A., & O’Sullivan JP (2017). The effects of seasonal variations in rainfall and production on the aquifer and surface features of Rotorua geothermal field. Geothermics, 69, 165-188. 10.1016/j.geothermics.2017.05.003
    Other University of Auckland co-authors: Michael OSullivan
  • Croucher, A., OSullivan, M. J., O'Sullivan JP, Pogacnik, J., Yeh, A., Burnell, J., & Kissling, W. (2016). Geothermal supermodels project: An update on flow simulator development. Paper presented at New Zealand Geothermal Workshop 2016, Auckland, New Zealand. 23 November - 25 November 2016. Proceedings: 38th New Zealand Geothermal Workshop.
    Other University of Auckland co-authors: Michael OSullivan, Adrian Croucher, Angus Yeh
  • Bjarkason, E., O'Sullivan JP, Yeh, A., & OSullivan, M. J. (2016). Combined natural state and history matching using the adjoint or direct sensitivity method. Paper presented at 38th New Zealand Geothermal Workshop, Auckland, New Zealand. 23 November - 25 November 2016. Proceedings 38th New Zealand Geothermal Workshop.
    Other University of Auckland co-authors: Michael OSullivan, Elvar Bjarkason, Angus Yeh
  • Saptadji, N., O'Sullivan J, Krzyzosiak, W., & O'Sullivan M (2016). Numerical modelling of Pohutu geyser, Rotorua, New Zealand. Geothermics, 64, 401-409. 10.1016/j.geothermics.2016.06.019
    URL: http://hdl.handle.net/2292/30477
    Other University of Auckland co-authors: Michael OSullivan
  • Ratouis, T. M., O'Sullivan MJ, & O'Sullivan JP (2016). A numerical model of Rotorua geothermal field. Geothermics, 60, 105-125. 10.1016/j.geothermics.2015.12.004
    Other University of Auckland co-authors: Michael OSullivan
  • Bjarkason, E. K., O'Sullivan MJ, O'Sullivan JP, & Yeh, A. (2016). Accelerating calibration of natural state geothermal models. Proceedings, 41st Workshop on Geothermal Reservoir Engineering Stanford, California, USA. Related URL.
    Other University of Auckland co-authors: Elvar Bjarkason, Angus Yeh
  • O'Sullivan J, O'Sullivan M, & Croucher, A. (2016). Improvements to the AUTOUGH2 supercritical simulator with extension to the air-water equation-of-state. Geothermal energy here and now: Sustainable, clean, flexible (Geothermal Resources Council Transactions volume 40), 40, 921-929. Davis, California, USA: Geothermal Resources Council.
    Other University of Auckland co-authors: Michael OSullivan, Adrian Croucher

Contact details

Primary office location

UNISERVICES HOUSE - Bldg 439
Level 4, Room 405
70 SYMONDS ST
AUCKLAND 1010
New Zealand