Hypersonic similarity for steady compressible full Euler flows over two-dimensional Lipschitz wedges.(English)Zbl 1547.35517
Summary: We establish the optimal convergence rate to the hypersonic similarity law, which is also called the Mach number independence principle, for steady compressible full Euler flows over two-dimensional slender Lipschitz wedges. Mathematically, it can be formulated as the comparison of the entropy solutions in \(BV \cap L^{1}\) between the two initial-boundary value problems for the compressible full Euler equations with parameter \(\tau > 0\) and the hypersonic small-disturbance equations (the scaled compressible full Euler equations with parameter \(\tau = 0\)) with curved characteristic boundaries. We establish the \(L^1\)-convergence estimate of these two solutions with the optimal convergence rate, which justifies the Van Dyke’s similarity theory rigorously for the compressible full Euler flows. This is the first mathematical result on the comparison of two solutions of the compressible Euler equations with characteristic boundary conditions. To achieve this, we first employ the special structures of the two systems and establish the global existence and the \(L^{1}\)-stability of the entropy solutions via the wave-front tracking scheme under the smallness assumption on the total variation of both the initial data and the tangential slope function of the wedge boundary. Based on the \(L^{1}\)-stability properties of the approximate solutions to the scaled equations with parameter \(\tau > 0\), a uniform Lipschtiz continuous map with respect to the initial data and the wedge boundary is obtained, which is the first time for the characteristic boundary conditions. Next, we compare the solutions given by the Riemann solvers of the two systems by taking the boundary perturbations into account case by case. Then, for a given fixed hypersonic similarity parameter, as the Mach number tends to infinity, by employing the Lipschitz continuous properties of the map, we establish the desired \(L^{1}\)-convergence estimate with the optimal convergence rate. Finally, we show the optimality of the convergence rate by investigating a special solution.
MSC:
| 35Q31 | Euler equations |
| 76K05 | Hypersonic flows |
| 76J20 | Supersonic flows |
| 76L05 | Shock waves and blast waves in fluid mechanics |
| 76N10 | Existence, uniqueness, and regularity theory for compressible fluids and gas dynamics |
| 76N15 | Gas dynamics (general theory) |
| 35B20 | Perturbations in context of PDEs |
| 35D30 | Weak solutions to PDEs |
| 35L65 | Hyperbolic conservation laws |
| 35A01 | Existence problems for PDEs: global existence, local existence, non-existence |
| 35A02 | Uniqueness problems for PDEs: global uniqueness, local uniqueness, non-uniqueness |
Keywords:
hypersonic similarity law;hypersonic small-disturbance equations;compressible full Euler equations;characteristic boundary;\(L^{1}\)-stability;BV entropy solutionsCite
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