Browsing by Author "Antoniadis, Antonis"

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    Numerical investigation of oleo-pneumatic shock absorber: a multi-fidelity approach
    (ECCOMAS, 2022-11-24) Sheikh Al Shabab, Ahmed; Grenko, Bojan; Vitlaris, Dimitrios; Tsoutsanis, Panagiotis; Antoniadis, Antonis; Skote, Martin
    A representative shock absorber geometry is developed based on the general guidelines available in the literature, and it is validated against experimental measurements from a drop test. Simulations are conducted using a multi-fidelity approach ranging from unsteady scale resolving three-dimensional simulations to dynamic system models. High fidelity simulations provide a detailed insight into the flow physics inside the shock absorber, as well as help calibrate and validate lower fidelity methods, under conditions for which no experimental measurements are available to achieve that purpose. On the other hand, lower fidelity methods are used to efficiently scan the design space and test the dependency of the shock absorber performance on the various design parameters, in addition to identifying parameter combinations that would be of interest to investigate using a high-fidelity approach.
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    Numerical investigation of oleo-pneumatic shock absorber: setup and validation
    (ECCOMAS, 2021-03-11) Sheikh Al-Shabab, Ahmed A.; Vitlaris, Dimitrios; Lin, Zhonglu; Grenko, Bojan; Tsoutsanis, Panagiotis; Antoniadis, Antonis; Skote, Martin
    The simulation of an oleo-pneumatic shock absorber is discussed focusing on the solver validation and high fidelity case setup. The multi-physics nature of the problem is tackled by conducting a range of validation cases in the base areas expected to be of relevance. A dynamic system model of the shock absorber is used to generate physically consistent boundary conditions. In addition, steady RANS simulations provide a preliminary insight into the internal flow development and to assist in the design of higher resolution grids.