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Euler equation existence, non-uniqueness and mesh converged statistics.
James Glimm1, David H Sharp2, Hyunkyung Lim3
1Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, NY 11794-3600, USA Computational Science Center, Brookhaven National Laboratory, Upton, NY 11793-6000, USA.
This study examines the Euler equation for fluid flow, highlighting non-uniqueness issues that challenge accurate simulations. A strategy to mitigate these problems is presented and illustrated with turbulent flow data.
Area of Science:
- Fluid dynamics
- Mathematical physics
Background:
- The Euler equation governs inviscid fluid flow.
- Existence and uniqueness of solutions are fundamental for physical modeling.
- Non-uniqueness poses challenges for computational fluid dynamics (CFD) simulations.
Purpose of the Study:
- To review existence and non-uniqueness results for the Euler equation.
- To contextualize these mathematical findings within physical fluid flow models.
- To propose and illustrate a strategy for mitigating non-uniqueness in simulations.
Main Methods:
- Literature review of theoretical results on the Euler equation.
- Analysis of mathematical solutions in the context of physical models.
- Examination of mesh-converged turbulent statistics.
- Comparison of simulation results with laboratory experiments.
Main Results:
- Non-uniqueness of solutions is a significant theoretical challenge.
- This non-uniqueness directly conflicts with the requirements for reliable CFD simulations.
- A strategy to address non-uniqueness is outlined and demonstrated.
Conclusions:
- Understanding non-uniqueness is crucial for accurate fluid flow modeling.
- Mitigation strategies are necessary for practical application of CFD.
- Validation against experimental data is essential for confirming simulation reliability.
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