Dr. Padmanathan Kathirgamanathan


Senior Lecturer Grade I
Head, Department of Interdisciplinary Studies


B.Sc (Hons), Dip in IT, MCMS (Waikato), PhD (Mathematics), PhD(Mechanical Engineering)


Research interests : Finite element modelling of engineering related problems.
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  pkathir@eng.jfn.ac.lk
 +94-21-206-0160


Dr Padmanathan Kathirgamanathan is a senior lecturer with a background in mathematics and engineering. He joined the Faculty in 2015. He is involved in numerical modelling of metal extrusion, pavement response model, chip seal surfacing, rock fall deformation models and seismic analysis of geo-technical problems. He has over 12 years of numerical modelling experience in the field of civil engineering, mechanical engineering and applied sciences and over 10 years of teaching experiences in mathematics. He hold PhDs in Mathematics and Engineering.


Overview: Finite element modelling of engineering related problems.




Seismic response of underground structures

Client: Ministry of Business, Innovation and Employment, New Zealand
Position Held: Research Scientist/Engineer
Brief: This project discusses the most advance techniques for buried pipes subjected to seismic loads. Effects of soil-structure interaction, pipe embedment, soil layering, material nonlinearity, and ground water table fluctuation are considered. Number of numerical models are developed within a finite element analysis framework in order to evaluate the dynamic stresses acting on buried pipes under the hypothesis that the soil is an elastic-plastic medium and the pipe can be held to be continuous or segmented. A number of real examples from damaged Christchurch area are investigated.


Geo synthetics in base course reinforcement- Finite element modelling

Client: New Zealand Transport Agency, New Zealand
Position Held: Research Scientist/Engineer
Brief: This research seeks to understand the possible advantages that various types of geo synthetic materials (geo cell, geo grid) might offer for the stabilization of pavement base course in situations of high shear, and where geological (aggregate/ground strength) or construction deficiencies exist or arise.


Numerical modelling of geo grid-reinforced rock fall protection embankments

Client: Christchurch city council, New Zealand
Position Held: Research Scientist/Engineer
Brief: This project investigates the behaviour of the rock fall protection embankments under the impact of rock blocks with high kinetic energies.


Chip seal finite element model

Client: Foundation for research science and technology, New Zealand
Position Held: Research Scientist/Engineer
Brief: This goal of a project is to develop a 3-D finite element model of a chip seal road surfacing.This research is a response to the challenge posed to the sustainability of the road network by the escalating costs of road maintenance being brought about by growing heavy vehicle numbers and the inefficient use of increasingly expensive, non-renewable resources, i.e. petroleum bitumen and aggregates.


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Finite element model of pavement response

Client: Foundation for research science and technology, New Zealand, New Zealand
Position Held: Research Scientist/Engineer
Brief: The project improves knowledge of the pavement deformation process and will lead to better pavement designs, increase of pavement life before failure and minimize of maintenance cost of the pavement.


Numerical simulation of aluminium extrusion

Client: Ulrich Aluminium, Hamilton, New Zealand
Position Held: Researcher
Brief: The goal of this project is to investigate a technique to find an optimal set of conditions tom extrude a product for a given shape and material properties with minimal defects.


Source parameter estimation of atmospheric pollution

Client: Massey University, New Zealand
Position Held: Researcher
Brief: The goal of this project is to build up an inverse model capable of finding release rate and location of atmospheric pollution by using measured pollution concentration data at some locations on the ground.


From land allocations to greenhouse gas reductions through key market interactions

Client: Landcare Research, New Zealand
Position Held: Matlab Programmer


Portfolio optimization

Client: University of Waikato, New Zealand
Position Held: Researcher




International Journals
17 results
2014
[17]Advanced Numerical Modelling of Geogrid-reinfrocedRockfall Protection (, and ), In Construction Engineering and Architecture, .
[16]Optimization Method of Extrusion Dies with a thin and complex shape ( and ), In Australian journal of Mechanical Engineering, .
2013
[15]Improvement of the performance of hotmix asphalt surfacings in New Zealand (, and ), In NZ Transport Agency research report,2013, .
2011
[14]Small scale accelerated testing machine (, , , and ), In Road & Transport Research, .
2009
[13]Optimization of pocket design to produce a thin shape complex profile ( and ), In Production Engineering, .
[12]Analysis of Particle Orientation in Compacted Unbound Aggregate (, , , and ), In Road Materials and Pavement Design, .
2008
[11]Optimal process control parameters estimation in aluminium extrusion for given product characteristics ( and ), In Lecture Notes in Engineering and Computer Science, .
[10]Inverse Modelling for Estimation of Average Grain Size and Material Constants - An Optimization Approach ( and ), In LectureNotes in Engineering and Computer Science, .
2004
[9]Source release-rate estimation of atmospheric pollution from a non-steady point source at a known location (, and ), In The journal of Environmental modeling and Assessment, .
2003
[8]Source release-rate estimation of atmospheric pollution from a non-steady point source - Part 2 (, and ), In Source at an unknown location, Lett. Inf. Math. Sci., 2003, .
[7]Source parameter estimation of atmospheric pollution from accidental releases of gas (), In PhD Thesis, Massey University, New Zealand, 2003, .
[6]Source release-rate estimation of atmospheric pollution from a non-steady point source - Part I (, and ), In Source at a known location, Lett. Inf. Math. Sci., 2003, .
[5]Inverse modeling for identifying the origin and release rate of atmospheric pollution - An optimization approach (, and ), In MODSIM 7(1), .
2002
[4]Modeling bio-energy with carbon storage (becs) in a 15-region version of Flames (, and ), In The Proceedings of Sixth International Conference on Greenhouse Gas Control Technologies 2002, .
2001
[3]Market dynamics of allocating land to bio fuel and forest sinks (, , , and ), In MODSIM, 6(3), .
[2]Source term estimation of pollution from instantaneous point source (, and ), In MODSIM, 6(2), .
1999
[1]A study of optimal investment strategies, Master thesis (), In Master thesis, University of Waikato, New Zealand, .
National Journals
1 result
2019
[1]EFFECT OF LAYER THICKNESS AND TYRE FOOTPRINT IN THE FLEXIBLE PAVEMENT DESIGN ( and ), In Proceedings of Advances in Concrete Technology, Structural Engineering and Design, University of Peradeniya, Sri Lanka, volume , .
International Conference and Workshop Papers
16 results
2018
[16]Whole-Body-Mechanical-Vibrations-of-Passengers-Traveling-in-Busses-in-Sri-Lanka (, , , and ), In Eighth International Conference On Advances in Mechanical, Aeronautical and Production Techniques – MALAYSIA, .
[15]Two Dimensional Space Curve Based Curvature Induced Stiffness Formulation for Large Deformable Structural Cables (, and ), In 8th INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL AND STRUCTURAL ENGINEERING, MALAYSIA, .
2017
[14]Structural Acoustic Coupling Resonance Of Hindu Temples (, , and ), In Proceedings of 54th IASTEM International Conference, Kuala Lumpur, Malaysia, May 2017, .
2016
[13]Inverse modelling for estimating an interface element properties in soil-pipe interaction- AN OPTIMIZATION APPROACH ( and ), In 7-th International conference on sustainable built environment, December-2016, .
2015
[12]Seismic analysis of underground pipelines subject to dynamic loading (, , and ), In 6th International Conference on Earthquake Geotechnical Engineering, November 2015, .
2014
[11]Seismic response of underground utilities following the Canterbury earthquakes (, , and ), In The Proceedings of the Institute of Public works Engineering Australasia, 2014, .
[10]Research findings on the seismic response of underground utilities (, , and ), In Proceedings of Water New Zealand, 2014, .
[9]Numerical modelling of road with chip seal surfacing layer ( and ), In The Proceedings of Jaffna University International research conference, 2014, .
2013
[8]Advanced Numerical Modelling of Geogrid-reinfrocedRockfall Protection Embankments (, and ), In The Procedings of New Zealand Geotechnical Society, 19, 2013, .
[7]Seismic response of underground utilities following the Canterbury earthquakes (, , and ), In The Procedings of New Zealand Geotechnical Society, 19, 2013, .
2012
[6]Chip seal finite element model ( and ), In Proceedings of Maintenance and Rehabilitation of pavements and Technological Control, 7, 2012, .
2008
[5]Optimal process control parameters estimation in aluminium extrusion for given product characteristics ( and ), In Proceedings of the World Congress on Engineering 2008 Vol II WCE 2008, .
[4]Inverse Modelling for Estimation of Average Grain Size and Material Constants - An Optimization Approach ( and ), In Proceedings of the World Congress on Engineering 2008 Vol IIWCE 2008, .
2006
[3]Modeling of metal extrusion using ABAQUS ( and ), In The Proceedings of New Zealand Metals Industry Conference, 3, 2006, .
2004
[2]Source parameter estimation of atmosphericpollution from Accidental Gas Releases (), In Proceedings of International Congress: Complexity and Integrated ResourcesManagement. International Environmental Modeling and Software Society, Osnabrueck, Germany, June 2004, .
2001
[1]From land allocations to greenhouse gas reductions through key market interactions: A multi region development of the FLAMES model to simulate trade in bio-fuel and conventional timber products driven by policy induced land use change (, , , and ), In Proceedings of International Energy workshop, IIASA, .
Other Publications
2 results
2015
[2]Geosynthetics in basecourse stabilisation (, , and ), PhD thesis, NZ Transport Agency research report 574, .
2013
[1]Parameter optimization of the process of AA6xxx and AA7xxx series aluminium extrusion (), PhD thesis, Auckland University of Technology, .