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Browsing by Author "Gledhill, Irvy MA"

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Accelerating flight: Edge with arbitrary acceleration

Author: Gledhill, Irvy MA Date: Nov 2011 This study concludes the possession of a theoretical framework for arbitrary manoeuvre which allows us to keep an eye on transformations. In the theory, relative frame equations are useful in guiding us in what to look for. The code is in the ... Read more
Acceleration effects on missile aerodynamics

Author: Gledhill, Irvy MA ; Nordström, J Date: 01 Sep 2010 Practical requirements are now arising in which significant acceleration takes place during flight; 5th generation missiles, such as A-Darter, execute turns at 100 g, where g is the acceleration due to gravity, and thrust from propulsion ... Read more
Acceleration parameters for fluid physics with accelerating bodies

Author: Gledhill, Irvy MA ; Roohani, H ; Biobaku, A ; Skews, B Date: Jun 2016 Theoretical work on transforming the Navier-Stokes equations into arbitrarily accelerating frames has included the continuity, momentum, and energy conservation equations. An analysis of the momentum equation in non-dimensional terms leads ... Read more
Aerodynamics in arbitrarily accelerating frames: application to high-g turns

Author: Gledhill, Irvy MA ; Nordström, J Date: Sep 2010 Fifth-generation missiles accelerate up to 100 g in turns, and higher accelerations are expected as agility increases. The auhtors have developed the theory of aerodynamics for arbitrary accelerations, and have validated modelling in a ... Read more
Aerodynamics in arbitrarily accelerating frames: application to high-g turns

Author: Gledhill, Irvy MA ; Nordstrom, J Date: Sep 2010 Fifth-generation missilies accelerate up to 100 g in turns, and higher accelerations are expected as agility increases. The authors have developed the theory of aerodynamics for arbitrary accelerations, and have validated modelling in a ... Read more
Characterisation of the flow regimes of arbitrary manoeuvre in absolute and relative frames

Author: Gledhill, Irvy MA ; Nordstrom, J Date: Sep 2011 This study concludes that: 1. the energy equation is expressed in terms of translations and rotational acceleration, 2. the generalised enthalpy equation is similarly expressed, 3. but the meaning of these is still to be explored, 4. dimensionless ... Read more
Characterization and properties of breakwater structures modelled by a physics engine

Author: Greben, JM ; Gledhill, Irvy MA ; Cooper, Antony K ; De Villiers, R Date: Jan 2010 The authors examine the question of stability of breakwater structures using the simulation software PhysX. This “physics engine” can be used to construct various packings of breakwater elements, each of which can be used to analyze the damage ... Read more
Compounds acting against HIV: Imidazo[1,2-a]pyridines as non-nucleoside reverse transcriptase inhibitors (NNRTIs)

Author: Bode, M ; Gledhill, Irvy MA ; Gravestock, D ; Hoppe, H ; Khan, T ; Moleele, S ; Nkabinde, L ; Pelly, S ; Van der Westhuyzen, Christiaan W Date: Sep 2010 A compound possessing anti-HIV activity similar to that of FDA-approved nevirapine was developed. It acts as a non-nucleoside reverse transcriptase inhibitor, the compound shows good cell permeability, and a quantitative structure activity ... Read more
Experimental and numerical studies of emulsion formation in a microfluidic T-junction

Author: Mbanjwa, MB ; Land, K ; Jewell, LL ; Gledhill, Irvy MA Date: Jan 2011 The production of water-in-oil (w/o) emulsions in T-junction microfluidic channels was studied through experiments and computational fluid dynamics (CFD). W/o emulsions were produced in the microchannels from deionised water and mineral oil. ... Read more
Experimental observation of capillary instabilities of two phase flow in a microfluidic T-junction

Author: Mbanjwa, MB ; Land, KJ ; Jewell, L ; Moss, EA ; Gledhill, Irvy MA Date: Jan 2010 This paper discusses the experimental observation of capillary instabilities of two-phase flow in a microfluidc T-junction. These instabilities are analogous to the classical Plateau-Rayleigh instabilities. The experiments were carried out ... Read more
GPU-based discrete element rigid body transport

Author: Govender, Nicolin ; Gledhill, Irvy MA ; Kok, S ; Wilke, N Date: Aug 2013 The protection of harbours and coastal infrastructure is of vital importance to South Africa. A major development in the design of packing strategies for breakwaters is numerical modelling, and the use of physics engines and DEM models. For ... Read more
Improving the workplace environment

Author: Gledhill, Irvy MA ; Butcher, G Date: Aug 2014 Research has shown that companies with more diversity and a better workplace perform better. So what makes a good workplace in physics, where women and men can work to their full potential? In the Improving the Workplace Environment workshop ... Read more
Investigation of acceleration effects on missile aerodynamics using computational fluid dynamics

Author: Gledhill, Irvy MA ; Forsberg, K ; Eliasson, P ; Baloyi, J ; Nordström, J Date: 2009 In this paper the authors describe the implementation and validation of arbitrarily moving reference frames in the block-structured CFD-code EURANUS. The paper also present results from calculations on two applications involving accelerating ... Read more
The Journey: Women in Physics in South Africa

Author: Gledhill, Irvy MA ; Diale, M ; Tibane, MM ; Maphanga, RR ; Thaoge, ML Date: Aug 2014 The progress from 2005 to now is evident. The journey has been a slow uphill with numbers increasing in the country. Different universities have graduated a woman in physics PhD while there are women professors in different institutions. ... Read more
Modelling flow phenomena in time dependent store release from transonic aircraft

Author: MacLucas, David A ; Gledhill, Irvy MA Date: Jul 2014 Computational Fluid Dynamics is routinely used in clearance of stores for carriage and release from aircraft in the transonic range of flight. A well-known validation case is modelled in this study, for which aerodynamic loads have been ... Read more
Navier-Stokes wave models for investigations of breakwater characteristics

Author: Cannoo, BR ; Gledhill, Irvy MA ; Cooper, Antony K ; Greben, JM Date: Mar 2008 The protection of coastal structures is important to South Africa. The dynamics of breakwaters is a topic that is becoming amenable to numerical study, in terms of the motion of multiple interlocking structures under wave action. In this ... Read more
Numerical modelling of structures of dolosse and their interaction with waves

Author: Greben, JM ; Cooper, Antony K ; Gledhill, Irvy MA ; de Villiers, R Date: Nov 2008 The authors have applied various numerical techniques to describe the stability of breakwater structures under the exposure of waves. These studies are intended to get a better understanding of the parameters playing a role in breakwater ... Read more
Personal professional development

Author: Rao, S ; Gledhill, Irvy MA ; Hartline, BK ; Lakhdar, ZB ; MacLachlan, AJ ; Mack, K ; Mehta, A ; Wu, L-A ; Zhang, H Date: Oct 2008 Three workshop sessions on personal professional development were held during the Third IUPAP Women in Physics Conference. These were designed to teach participants about planning for career success, "survival skills," negotiation, and ways ... Read more
Preliminary physics-engine model of dolosse interacting with one another

Author: Cooper, Antony K ; Greben, JM ; Van Den Bergh, F ; Gledhill, Irvy MA ; Cannoo, BR ; Steyn, WJVDM ; De Villiers, R Date: Mar 2008 A variety of armour units are used to protect breakwaters, piers and other harbour infrastructure, serving both to absorb the impact of violent seas and to reduce overtopping. A common type of armour unit is the dolos. Coastal engineers use ... Read more
Simulating the rubble mound underlying armour units protecting a breakwater

Author: Cooper, Antony K ; de Villiers, R ; Greben, JM ; van der Bergh, F ; Gledhill, Irvy MA Date: Jan 2010 A variety of concrete armour units laid on top of rubble mounds are used to protect breakwaters and other harbour infrastructure. Coastal engineers build three-dimensional physical scale models to understand the dynamic processes caused by ... Read more

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