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Browsing Defence, peace, safety & security by Author "Gledhill, Irvy MA"

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  • Gledhill, Irvy MA (2011-11)
    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 ...
  • Gledhill, Irvy MA; Nordström, J (CSIR, 2010-09-01)
    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 ...
  • Gledhill, Irvy MA; Roohani, H; Biobaku, A; Skews, B (SA Institute of Physics, 2016-06)
    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 ...
  • Gledhill, Irvy MA; Nordstrom, J (SAIP 2010, 2010-09)
    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 ...
  • Gledhill, Irvy MA; Nordström, J (2010-09)
    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 ...
  • Gledhill, Irvy MA; Nordstrom, J (2011-09)
    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 ...
  • Gledhill, Irvy MA; Butcher, G (AIP Conference proceedigs, 2014-08)
    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 ...
  • Gledhill, Irvy MA; Forsberg, K; Eliasson, P; Baloyi, J; Nordström, J (Elsevier, 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 ...
  • MacLucas, David A; Gledhill, Irvy MA (SAIP, 2014-07)
    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 ...
  • Cannoo, BR; Gledhill, Irvy MA; Cooper, Antony K; Greben, JM (South African Conference on Computational and Applied Mechanics SACAM08, 2008-03)
    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 ...
  • Cooper, Antony K; Greben, JM; Van Den Bergh, F; Gledhill, Irvy MA; Cannoo, BR; Steyn, WJVDM; De Villiers, R (South African Conference on Computational and Applied Mechanics SACAM08, 2008-03)
    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. ...
  • Cooper, Antony K; de Villiers, R; Greben, JM; van der Bergh, F; Gledhill, Irvy MA (SACAM10, 2010-01)
    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 ...
  • Van Zyl, Louwrens H; Gledhill, Irvy MA (2011-11)
    A grid was generated with the base of the fin, i.e. the hinge line, on the axis of a cylindrical domain with a diameter of 2m. Due to the axial symmetry of the setup, rotation of the T-tail should not change the pressure ...
  • Gledhill, Irvy MA; Roohani, H; Forsberg, K; Eliasson, P; Skews, BW; Nordström, J (Springer Verlag, 2016-02)
    Most computational fluid dynamics simulations are, at present, performed in a body-fixed frame, for aeronautical purposes. With the advent of sharp manoeuvre, which may lead to transient effects originating in the acceleration ...

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