Nonlinear elliptic boundary problems

1991 ◽  
pp. 163-177
Author(s):  
Michael E. Taylor
Keyword(s):  
Elliptic Boundary ◽  
Boundary Problems ◽  
Nonlinear Elliptic ◽  
Nonlinear Elliptic Boundary

scholarly journals Small-amplitude static periodic patterns at a fluid–ferrofluid interface

2018 ◽  
Vol 474 (2216) ◽  
pp. 20180038
Author(s):  
M. D. Groves ◽  
J. Horn
Keyword(s):  
Small Amplitude ◽  
Bifurcation Theory ◽  
Elliptic Boundary ◽  
Local Bifurcation ◽  
Periodic Patterns ◽  
Elliptic Boundary Value ◽  
Nonlinear Elliptic ◽  
Nonlinear Elliptic Boundary ◽  
Rosensweig Instability ◽  
Nonlinear Magnetization

We establish the existence of static doubly periodic patterns (in particular rolls, squares and hexagons) on the free surface of a ferrofluid near onset of the Rosensweig instability, assuming a general (nonlinear) magnetization law. A novel formulation of the ferrohydrostatic equations in terms of Dirichlet–Neumann operators for nonlinear elliptic boundary-value problems is presented. We demonstrate the analyticity of these operators in suitable function spaces and solve the ferrohydrostatic problem using an analytic version of Crandall–Rabinowitz local bifurcation theory. Criteria are derived for the bifurcations to be sub-, super- or transcritical with respect to a dimensionless physical parameter.

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