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Construction of Green's functions for the Boltzmann equations Shih-Hsien Yu Department of Mathematics National University of Singapore.

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Presentation on theme: "Construction of Green's functions for the Boltzmann equations Shih-Hsien Yu Department of Mathematics National University of Singapore."— Presentation transcript:

1 Construction of Green's functions for the Boltzmann equations Shih-Hsien Yu Department of Mathematics National University of Singapore

2 Motivation to investigate Green’s function for Boltzmann equation before 2003 Nonlinear time-asymptotic stability of a Boltzmann shock profile Zero total macroscopic perturbations Nonlinear time-asymptotic stability of a Knudsen layer for the Boltzmann Equation Mach number <-1

3 Green’s function of linearized equation around a global Maxwellian, Fourier transformation The inverse transformation

4 Initial value problem Particle-like wave-like decomposition

5

6 Pointwise of structure of the Green’s function Space dimension=3 Space dimension=1

7 Macroscopic wave structure of 1-D Green’s function Application: Pointwise time-asymptotic stability of a global Maxwellian state in 1-D.

8 Green’s function of linearized equation around a global Maxwellian M,, in a half-space problem x>0. Green identity: Boundary value estimates ( a priori estimate):

9 Approximate boundary data for case |Mach(M)|<1 Upwind damping approximation to the boundary data

10 An approximation to the full boundary data.

11 Green’s function of linearized equation around a stationary shock profile.

12 Separation of wave structures Transversal wave Compressive wave

13 1. Shift data

14 2. Hyperbolic Decomposition Transversal wave Compressive wave 3. Transverse Operator and Local Wave Front tracing

15 4. Coupling of T and D operators 5. Respond to Coupling

16 6. Approximation to Respond, Compressive Operator

17 6. T-C scheme for An estimates

18 A Diagram for A Diagram for general pattern + extra time decaying rate in microscopic component nonlinear stability of Boltzmann shock profile

19 Applications of the Green’s functions Nonlinear invariant manifolds for steady Boltzmann flow

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21 Applications of the Green’s functions Milne’s problme

22 Sone’s Diagram for Condensation-Evaporation


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