Modelo semidiscreto para una ecuación de difusión no local con fuente

• Bogoya, Mauricio ^[1] ; Forero, Alberto ^[1]
  1. [1] Universidad Nacional de Colombia

     Universidad Nacional de Colombia

     Colombia

     
• Localización: Integración: Temas de matemáticas, ISSN 0120-419X, Vol. 30, Nº. 2, 2012 (Ejemplar dedicado a: Revista Integración), págs. 107-120
• Idioma: español
• Títulos paralelos:
  • A semidiscrete model for a non-local diffusion equation with a source
• Enlaces
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• Resumen
  • español

    Estudiamos el modelo semidiscreto para un problema de difusión no local con fuente (ui) ′ (t) = N j=−N hJ h(i − j) uj(t) – N j=−N hJ h(i − j) ui(t) + f(ui(t)), con dato inicial ui(0) = u0(xi) > 0. Probamos la existencia y unicidad de las soluciones. Además, se demuestra que las soluciones del problema discreto convergen a las del continuo cuando el parámetro de la malla va a cero. Analizamos el fenómeno de explosión de las soluciones. Para algunas fuentes f se obtiene la razón de explosión. Finalmente se presentan algunos experimentos numéricos.

  • English

    We study a discrete model for a non-local diffusion problem with a source, namely (ui) ′ (t) = Nj=−N hJ h(i − j) uj(t) – N j=−N hJ h(i − j) ui(t) + f(ui(t)), with initial datum ui(0) = u0(xi) > 0. We prove the existence and uniqueness of the solution. Moreover, we show that solutions of discrete problem converge to the continuous ones when the mesh parameter goes to zero. We also study the blow-up phenomena of solutions. For some sources f, we obtain the blow-up rate. Finally, we perform some numerical experiments.

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