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|Title:||Kinetic energy fix for low internal energy flows|
Low internal energy flow
|Source:||Hu, X.Y., Khoo, B.C. (2004-01-01). Kinetic energy fix for low internal energy flows. Journal of Computational Physics 193 (1) : 243-259. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jcp.2003.08.007|
|Abstract:||When the kinetic energy of a flow is dominant, numerical schemes employed can encounter difficulties due to negative internal energy. A case study with several commonly used conservative schemes (MUSCL, ENO, WENO and CE/SE) shows that high order schemes may have less ability to preserve positive internal energy (MUSCL and CE/SE), or present less accurate results (WENO and ENO) when the internal energy to kinetic energy ratio is low. By analyzing the positivity property for second-order conservative schemes with large fixed CFL number conditions for time step restriction, this paper proposes the energy consistency conditions for second-order Riemann-solver type schemes and CE/SE method. According to the said energy consistency conditions, a kinetic energy fix method which limits the magnitude of kinetic energy relative to the total energy is introduced. The numerical examples show that the kinetic energy fixed CE/SE method produces reasonable results and keeps positive internal energy for flows with very low internal energy even when a vacuum occurs. © 2003 Elsevier B.V. All rights reserved.|
|Source Title:||Journal of Computational Physics|
|Appears in Collections:||Staff Publications|
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