A boundary value problem for the spherically symmetric motion of a pressureless gas with a temperature-dependent viscosity

2009 ◽  
Vol 32 (16) ◽  
pp. 2071-2101 ◽  
Author(s):  
Bernard Ducomet ◽  
Šárka Nečasová
Keyword(s):  
Boundary Value Problem ◽  
Boundary Value ◽  
Spherically Symmetric ◽  
Temperature Dependent ◽  
Symmetric Motion ◽  
Temperature Dependent Viscosity ◽  
Spherically Symmetric Motion ◽  
Dependent Viscosity

scholarly journals Non-Isothermal Creeping Flows in a Pipeline Network: Existence Results

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1300
Author(s):  
Evgenii S. Baranovskii ◽  
Vyacheslav V. Provotorov ◽  
Mikhail A. Artemov ◽  
Alexey P. Zhabko
Keyword(s):  
Nonlinear Boundary ◽  
Galerkin Approximation ◽  
Large Data ◽  
Temperature Dependent ◽  
Weak Formulation ◽  
Temperature Dependent Viscosity ◽  
Pipeline Network ◽  
Flux Boundary Conditions ◽  
Creeping Flows ◽  
Dependent Viscosity

This paper deals with a 3D mathematical model for the non-isothermal steady-state flow of an incompressible fluid with temperature-dependent viscosity in a pipeline network. Using the pressure and heat flux boundary conditions, as well as the conjugation conditions to satisfy the mass balance in interior junctions of the network, we propose the weak formulation of the nonlinear boundary value problem that arises in the framework of this model. The main result of our work is an existence theorem (in the class of weak solutions) for large data. The proof of this theorem is based on a combination of the Galerkin approximation scheme with one result from the field of topological degrees for odd mappings defined on symmetric domains.

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