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)

  • 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, Thomas Ratouis
  • 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. P., 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, Thomas Ratouis
  • 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
  • Ratouis, T. M. P., O'Sullivan MJ, Walker, C. G., & O'Sullivan JP (2016). Statistical analysis of the temperature variations in geothermal surface features using a numerical model of rotorua. 22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016.
    Other University of Auckland co-authors: Cameron Walker, Michael OSullivan, Thomas Ratouis
  • O'Sullivan JP, Arthur, S., & O'Sullivan MJ (2016). A new reservoir model to support environmental monitoring of the Orakeikorako geothermal system. Geothermics, 59 (Part A), 90-106. 10.1016/j.geothermics.2015.10.004
    Other University of Auckland co-authors: Michael OSullivan
  • Pogacnik, J., Elsworth, D., O’Sullivan M, & O’Sullivan J (2016). A damage mechanics approach to the simulation of hydraulic fracturing/shearing around a geothermal injection well. Computers and Geotechnics, 71, 338-351. 10.1016/j.compgeo.2015.10.003
    Other University of Auckland co-authors: Justin Pogacnik, Michael OSullivan

Contact details

Primary location

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