• mathematical analysis to a nonlinear fourth-order partial differential equation

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 437
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    with navier boundary conditions in multidimensional space. by the truncation method, a fixed point argument and some energy estimates, the existence and asymptotic limit δ→0 for the positive weak solutions are given. second, the parabolic equation ut+(un|uxxx|q−2uxxx)x−δumuxx=0 with a navier boundary in one-dimensional space is researched. the existence is obtained by applying a semi-discrete method for the time variable and solving the corresponding elliptic problem. the uniqueness is shown for q=2 depending on an energy estimate. in addition, the iteration relation of the semi-discrete problem gives an exponential decay result for the time t→∞. the thin film equation, which is usually used to describe the motion of a very thin layer of viscous in compressible fluids along an inclined plane, is a class of nonlinear fourth-order parabolic equations and the maximum principle does not hold directly. for applying the classic theory of partial differential equation, the paper transforms the fourth-order problem into a second-order elliptic–elliptic system or a second-order parabolic–elliptic system. 

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