scholarly journals Global existence of solutions for a strongly coupled population system

2003 ◽  
Author(s):  
Gonzalo Galiano ◽  
Ansgar Jüngel
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Population System ◽  
Strongly Coupled ◽  
Global Existence Of Solutions

Weighted Gagliardo–Nirenberg Inequalities Involving BMO Norms and Solvability of Strongly Coupled Parabolic Systems

2016 ◽  
Vol 16 (1) ◽  
pp. 125-146 ◽  
Author(s):  
Dung Le
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Sufficient Conditions ◽  
Parabolic Systems ◽  
Strongly Coupled ◽  
Global Existence Of Solutions ◽  
Coupled Parabolic Systems

AbstractNew weighted Gagliardo–Nirenberg inequalities are introduced together with applications to the local/global existence of solutions to nonlinear strongly coupled and uniform parabolic systems. Much weaker sufficient conditions than those existing in literature for solvability of these systems will be established.

Global existence of solutions for a chemotaxis-type system arising in crime modelling

2012 ◽  
Vol 24 (2) ◽  
pp. 273-296 ◽  
Author(s):  
RAÚL MANÁSEVICH ◽  
QUOC HUNG PHAN ◽  
PHILIPPE SOUPLET
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Specific Interaction ◽  
Type System ◽  
Sensitivity Function ◽  
Residential Areas ◽  
Strongly Coupled ◽  
Global Existence Of Solutions ◽  
Logarithmic Sensitivity ◽  
Appl Math

We consider a nonlinear, strongly coupled, parabolic system arising in the modelling of burglary in residential areas. This model appeared in Pitcher (Eur. J. Appl. Math., 2010, Vol. 21, pp. 401–419), as a more realistic version of the Short et al. (Math. Models Methods Appl. Sci., 2008, Vol. 18, pp. 1249–1267) model. The system under consideration is of chemotaxis-type and involves a logarithmic sensitivity function and specific interaction and relaxation terms. Under suitable assumptions on the data of the problem, we give a rigorous proof of the existence of a global and bounded, classical solution, thereby solving a problem left open in previous work on this model. Our proofs are based on the construction of approximate entropies and on the use of various functional inequalities. We also provide explicit numerical conditions for global existence when the domain is a square, including concrete cases involving values of the parameters which are expected to be physically relevant.

scholarly journals Global Existence to an Attraction-Repulsion Chemotaxis Model with Fast Diffusion and Nonlinear Source

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Yingjie Zhu ◽  
Fuzhong Cong
Keyword(s):  
Global Existence ◽  
Cell Density ◽  
Existence Of Solutions ◽  
Neumann Boundary ◽  
Energy Estimates ◽  
Fast Diffusion ◽  
Chemotaxis Model ◽  
Nonlinear Source ◽  
Strongly Coupled ◽  
Global Existence Of Solutions

This paper deals with the global existence of solutions to a strongly coupled parabolic-parabolic system of chemotaxis arising from the theory of reinforced random walks. More specifically, we investigate the attraction-repulsion chemotaxis model with fast diffusive term and nonlinear source subject to the Neumann boundary conditions. Such fast diffusion guarantees the global existence of solutions for any given initial value in a bounded domain. Our main results are based on the method of energy estimates, where the key estimates are obtained by a technique originating from Moser’s iterations. Moreover, we notice that the cell density goes to the maximum value when the diffusion coefficient of the cell density tends to infinity.

scholarly journals The Muskat problem with surface tension and equal viscosities in subcritical $$L_p$$-Sobolev spaces

2021 ◽  
Author(s):  
Anca-Voichita Matioc ◽  
Bogdan-Vasile Matioc
Keyword(s):  
Mathematical Model ◽  
Surface Tension ◽  
Global Existence ◽  
Sobolev Spaces ◽  
Existence Of Solutions ◽  
Well Posedness ◽  
Global Existence Of Solutions ◽  
Muskat Problem ◽  
The Mathematical Model ◽  
Quasilinear Parabolic

AbstractIn this paper we establish the well-posedness of the Muskat problem with surface tension and equal viscosities in the subcritical Sobolev spaces $$W^s_p(\mathbb {R})$$ W p s ( R ) , where $${p\in (1,2]}$$ p ∈ ( 1 , 2 ] and $${s\in (1+1/p,2)}$$ s ∈ ( 1 + 1 / p , 2 ) . This is achieved by showing that the mathematical model can be formulated as a quasilinear parabolic evolution problem in $$W^{\overline{s}-2}_p(\mathbb {R})$$ W p s ¯ - 2 ( R ) , where $${\overline{s}\in (1+1/p,s)}$$ s ¯ ∈ ( 1 + 1 / p , s ) . Moreover, we prove that the solutions become instantly smooth and we provide a criterion for the global existence of solutions.

scholarly journals Global existence of solutions for a multi-phase flow: A drop in a gas-tube

2016 ◽  
Vol 13 (02) ◽  
pp. 381-415
Author(s):  
Debora Amadori ◽  
Paolo Baiti ◽  
Andrea Corli ◽  
Edda Dal Santo
Keyword(s):  
Global Existence ◽  
Existence Of Solutions ◽  
Inviscid Fluid ◽  
Phase Flow ◽  
Lagrangian Coordinates ◽  
Large Initial Data ◽  
Initial Value ◽  
Global Existence Of Solutions ◽  
Multi Phase Flow ◽  
Multi Phase

In this paper we study the flow of an inviscid fluid composed by three different phases. The model is a simple hyperbolic system of three conservation laws, in Lagrangian coordinates, where the phase interfaces are stationary. Our main result concerns the global existence of weak entropic solutions to the initial-value problem for large initial data.

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