... P L2 (Q) + f L2 (Q) + g L2 (Q) ) 2 + C2 ( φ L2 ( Ω) + h L2 ( Σ) + U0 2 ( Ω) ), L where U = U1 − U2 , P = P1 − P2 , φ = φ1 − 2 , f = f − f , g = g1 − g2 , h = h1 − h2 and U0 = U01 − U 02 48 Heat ... = 20 52 Heat Transfer Heat Transfer - Mathematical Modelling, Numerical Methods and Information Technology √ √ √ diag( m1 , m2 , m3 ), are predefined nonnegative weights such that n1 + n2 = and ... C2 ( ϕ + L2 (Q) L2 ( Ω ) + ξ η ) L2 (Q) L2 (Q) + π L2 ( Σ ) ) + C3 u0 L2 ( Ω ) , (24 ) where u = u1 − u2 , p = p1 − p2 , ϕ = ϕ1 − 2 , ξ = ξ − ξ , η = η1 − 2 , π = π1 − 2 and u0 = u01 − u02...