Abstract
We present a novel pressure-based method for weakly compressible multiphase flows, based on a non-equilibrium Baer and Nunziato-type model. Each component is described by its own thermodynamic model, thus the definition of a mixture speed of sound is not required. In this work, we describe the hyperbolic operator, without considering relaxation terms. The acoustic part of the governing equations is treated implicitly to avoid the severe restriction on the time step imposed by the CFL condition at low-Mach. Particular care is taken to discretize the non-conservative terms to avoid spurious oscillations across multi-material interfaces. The absence of oscillations and the agreement with analytical or published solutions is demonstrated in simplified test cases, which confirm the validity of the proposed approach as a building block on which developing more accurate and comprehensive methods.
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Notes
- 1.
The discretization of \(\mathsf {H}_P\) is obtained by assuming uniform \((u_i)^n\) and \((P_i)^n\) in (11) and substituting into its left-hand side \((\alpha _i m_i)_{j+\frac{1}{2}}^*=(\alpha _i \rho _i)_{j+\frac{1}{2}}^{n+1}\) the discretization of \((\alpha _i \rho _i)_{j+\frac{1}{2}}^{n+1}\) from (9).
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Acknowledgments
This publication has been produced with support from the NCCS Centre, performed under the Norwegian research program Centres for Environment-friendly Energy Research (FME). The authors acknowledge the following partners for their contributions: Aker Solutions, Ansaldo Energia, CoorsTek Membrane Sciences, Emgs, Equinor, Gassco, Krohne, Larvik Shipping, Norcem, Norwegian Oil and Gas, Quad Geometrics, Shell, Total, Vår Energi, and the Research Council of Norway (257579/E20).
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Re, B., Abgrall, R. (2020). Non-equilibrium Model for Weakly Compressible Multi-component Flows: The Hyperbolic Operator. In: di Mare, F., Spinelli, A., Pini, M. (eds) Non-Ideal Compressible Fluid Dynamics for Propulsion and Power. NICFD 2018. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-49626-5_3
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