On the stability at all times of linearly extrapolated BDF2 timestepping for multiphysics incompressible flow problems


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AKBAŞ M. , KAYA S. , Rebholz L. G.

NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS, cilt.33, sa.4, ss.999-1017, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33 Konu: 4
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1002/num.22061
  • Dergi Adı: NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
  • Sayfa Sayıları: ss.999-1017

Özet

We prove long-time stability of linearly extrapolated BDF2 (BDF2LE) timestepping methods, together with finite element spatial discretizations, for incompressible Navier-Stokes equations (NSE) and related multiphysics problems. For the NSE, Boussinesq, and magnetohydrodynamics schemes, we prove unconditional long time L-2 stability, provided external forces (and sources) are uniformly bounded in time. We also provide numerical experiments to compare stability of BDF2LE to linearly extrapolated Crank-Nicolson scheme for NSE, and find that BDF2LE has better stability properties, particularly for smaller viscosity values. (c) 2016 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 33: 999-1017, 2017