TAILIEUCHUNG - Luong and Loi Boundary Value Problems 2011, 2011:56

Luong and Loi Boundary Value Problems 2011, 2011:56 RESEARCH Open Access Initial boundary value problems for second order parabolic systems in cylinders with polyhedral base Vu Trong Luong1* and Do Van Loi2 * Correspondence: luongvt2003@ 1 Department of Mathematics, Taybac University, Sonla city, Sonla, Vietnam Full list of author information is available at the end of the article Abstract The purpose of this article is to establish the well posedness and the regularity of the solution of the initial boundary value problem with Dirichlet boundary conditions for second-order parabolic systems in cylinders with polyhedral base. 1 Introduction Boundary value problems for partial differential equations and systems. | Luong and Loi Boundary Value Problems 2011 2011 56 http content 2011 1 56 o Boundary Value Problems a SpringerOpen Journal RESEARCH Open Access Initial boundary value problems for second order parabolic systems in cylinders with polyhedral base Vu Trong Luong 1 and Do Van Loi2 Correspondence luongvt2003@ department of Mathematics Taybac University Sonla city Sonla Vietnam Full list of author information is available at the end of the article Springer Abstract The purpose of this article is to establish the well posedness and the regularity of the solution of the initial boundary value problem with Dirichlet boundary conditions for second-order parabolic systems in cylinders with polyhedral base. 1 Introduction Boundary value problems for partial differential equations and systems in nonsmooth domains have been attracted attentions of many mathematicians for more than last 50 years. We are concerned with initial boundary value problems IBVP for parabolic equations and systems in nonsmooth domains. These problems in cylinders with bases containing conical points have been investigated in 1 2 in which the regularity and the asymptotic behaviour near conical points of the solutions are established. Parabolic equations with discontinuous coefficients in Lipschitz domains have also been studied see 3 and references therein . In this study we consider IBVP with Dirichlet boundary conditions for second-order parabolic systems in both cases of finite cylinders and infinite cylinders whose bases are polyhedral domains. Firstly we prove the well posedness of this problem by Galer-kin s approximating method. Next by this method we obtain the regularity in time of the solution. Finally we apply the results for elliptic boundary value problems in polyhedral domains given in 4 5 and former our results to deal with the global regularity of the solution. Let o be an open polyhedral domain in R n 2 3 and 0 T . Set QT o X 0 T ST do X 0 T . For a

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