TY - JOUR

T1 - A family of steady two-phase generalized Forchheimer flows and their linear stability analysis

AU - Hoang, Luan T.

AU - Ibragimov, Akif

AU - Kieu, Thinh T.

N1 - Publisher Copyright:
© 2014 AIP Publishing LLC.

PY - 2014/12/10

Y1 - 2014/12/10

N2 - We model multi-dimensional two-phase flows of incompressible fluids in porous media using generalized Forchheimer equations and the capillary pressure. First, we find a family of steady state solutions whose saturation and pressure are radially symmetric, and velocities are rotation-invariant. Their properties are investigated based on relations between the capillary pressure, each phase's relative permeability and Forchheimer polynomial. Second, we analyze the linear stability of those steady states. The linearized system is derived and reduced to a parabolic equation for the saturation. This equation has a special structure depending on the steady states which we exploit to prove two new forms of the lemma of growth of Landis-type in both bounded and unbounded domains. Using these lemmas, qualitative properties of the solution of the linearized equation are studied in details. In bounded domains, we show that the solution decays exponentially in time. In unbounded domains, in addition to their stability, the solution decays to zero as the spatial variables tend to infinity. The Bernstein technique is also used in estimating the velocities. All results have a clear physical interpretation.

AB - We model multi-dimensional two-phase flows of incompressible fluids in porous media using generalized Forchheimer equations and the capillary pressure. First, we find a family of steady state solutions whose saturation and pressure are radially symmetric, and velocities are rotation-invariant. Their properties are investigated based on relations between the capillary pressure, each phase's relative permeability and Forchheimer polynomial. Second, we analyze the linear stability of those steady states. The linearized system is derived and reduced to a parabolic equation for the saturation. This equation has a special structure depending on the steady states which we exploit to prove two new forms of the lemma of growth of Landis-type in both bounded and unbounded domains. Using these lemmas, qualitative properties of the solution of the linearized equation are studied in details. In bounded domains, we show that the solution decays exponentially in time. In unbounded domains, in addition to their stability, the solution decays to zero as the spatial variables tend to infinity. The Bernstein technique is also used in estimating the velocities. All results have a clear physical interpretation.

UR - http://www.scopus.com/inward/record.url?scp=84916912251&partnerID=8YFLogxK

U2 - 10.1063/1.4903002

DO - 10.1063/1.4903002

M3 - Article

AN - SCOPUS:84916912251

SN - 0022-2488

VL - 55

JO - Journal of Mathematical Physics

JF - Journal of Mathematical Physics

IS - 12

M1 - 123101

ER -