Browsing by Author "Adebayo, Ebenezer Mayowa"

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    A review of diffuse interface-capturing methods for compressible multiphase flows
    (MDPI, 2025-04-03) Adebayo, Ebenezer Mayowa; Tsoutsanis, Panagiotis; Jenkins, Karl W.
    This paper discusses in detail the classification, historical development, and application of diffuse interface-capturing models (DIMs) for compressible multiphase flows. The work begins with an overview of the development of DIMs, highlighting important contributions and key moments from classical studies to contemporary advances. The theoretical foundations and computational methods of the diffuse interface method are outlined for the full models and the reduced models or sub-models. Some of the difficulties encountered when using DIMs for multiphase flow modelling are also discussed.
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    Application of central-weighted essentially non-oscillatory finite-volume interface-capturing schemes for modeling cavitation induced by an underwater explosion
    (MDPI, 2024-01-29) Adebayo, Ebenezer Mayowa; Tsoutsanis, Panagiotis; Jenkins, Karl W.
    Cavitation resulting from underwater explosions in compressible multiphase or multicomponent flows presents significant challenges due to the dynamic nature of shock–cavitation–structure interactions, as well as the complex and discontinuous nature of the involved interfaces. Achieving accurate resolution of interfaces between different phases or components, in the presence of shocks, cavitating regions, and structural interactions, is crucial for modeling such problems. Furthermore, pressure convergence in simulations involving shock–cavitation–structure interactions requires accurate algorithms. In this research paper, we employ the diffuse interface method, also known as the interface-capturing scheme, to investigate cavitation in various underwater explosion test cases near different surfaces: a free surface and a rigid surface. The simulations are conducted using the unstructured compressible Navier–Stokes (UCNS3D) finite-volume framework employing central-weighted essentially non-oscillatory (CWENO) reconstruction schemes, utilizing the five-equation diffuse interface family of methods. Quantitative comparisons are made between the performance of both models. Additionally, we examine the effects of cavitation as a secondary loading source on structures, and evaluate the ability of the CWENO schemes to accurately capture and resolve material interfaces between fluids with minimal numerical dissipation or smearing. The results are compared with existing high-order methods and experimental data, where possible, to demonstrate the robustness of the CWENO schemes in simulating cavitation bubble dynamics, as well as their limitations within the current implementation of interface capturing.
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    CWENO finite-volume interface capturing schemes for multicomponent flows using unstructured meshes
    (Springer, 2021-11-09) Tsoutsanis, Panagiotis; Adebayo, Ebenezer Mayowa; Carriba Merino, Adrian; Perez Arjona, Agustin; Skote, Martin
    In this paper we extend the application of unstructured high-order finite-volume central-weighted essentially non-oscillatory (CWENO) schemes to multicomponent flows using the interface capturing paradigm. The developed method achieves high-order accurate solution in smooth regions, while providing oscillation free solutions at discontinuous regions. The schemes are inherently compact in the sense that the central stencils employed are as compact as possible, and that the directional stencils are reduced in size, therefore simplifying their implementation. Several parameters that influence the performance of the schemes are investigated, such as reconstruction variables and their reconstruction order. The performance of the schemes is assessed under a series of stringent test problems consisting of various combinations of gases and liquids, and compared against analytical solutions, computational and experimental results available in the literature. The results obtained demonstrate the robustness of the new schemes for several applications, as well as their limitations within the present interface-capturing implementation.
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    High-order finite-volume methods for compressible multiphase flows using unstructured meshes
    (Cranfield University, 2023-03) Adebayo, Ebenezer Mayowa; Tsoutsanis, Panagiotis
    For the simulation of multi-component or multiphase compressible flows, presented in this thesis is a computationally efficient high-resolution numerical methods that capture shocks and interfaces in the finite-volume framework on unstructured grids. The robustness of the CWENO high-order schemes in capturing and resolving the material interface in multi-component or multiphase flows in the presence of strong gradients and material discontinuities with oscillation-free solutions and reduced numerical diffusion is demon- strated using the diffuse interface framework implemented in the open-source unstru- ctured compressible flow UCNS3D. The UCNS3D is an in-house code in the finite volume framework written in FORTRAN that is being actively developed by members of Cranfield University. For this research, some additional multiphase features were implemented in the code and continuously improved throughout this thesis. Stringent two- and three-dimensional compressible multiphase/multi-component test cases, including cavitation, were employed to assess the numerical methods. Results were compared with other high-order methods and existing experiments, demonstrating that CWENO is less dissipative, eliminates spurious oscillations at material boundaries, and provides a high-resolution description of material interfaces with minimal artificial smearing. These findings highlight CWENO’s superior capability in accurately simulating complex multiphase or multi-component phenomena in compressible flows.