NON LINEAR PDE
in [Matlab]
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From: TideMan on 22 Jun 2010 21:57 On Jun 23, 1:31 pm, "sridhar " <madhira.srid...(a)gmail.com> wrote: > Given the second order non linear BVP > > (ƒ')^n = 1 + γ θ …..……………………… 1 > > θ" + [(λ +n+1)/( 2n +1)] ƒ θ' - n [(2 λ +1)/(2n+ 1)] * ƒ' θ = 0 ………… 2 > > Prime in the above eqn’s describe partial differentiation with respect to η > > Boundary conditions are > ƒ (0) = 0, θ'(0) = -1 > ƒ' (∞) = 0, θ(∞) = 0 > > The above nonlinear coupled system of equations for ƒ and θ have been derived from conservation laws that govern the boundary layer flow on vertical plate in porous medium by introducing similarity variable η and stream function ψ > > where > γ can be assumed as a Rayleigh number type i.e it represents the relative importance > of free to forced convection > η is a function of x & y given by > Similarity variable, η = x ^ (λ-n/2n+1) * y > n is the permeability > ƒ is a dimensionless stream function given by > Stream function, ψ = x ^ (λ+n+1/2n+1) * ƒ(η) > θ is a dimensionless temperature given by > T = x^ [{n(2 λ+1)/2n+1}]* θ(η) and > λ is a scalar obtained by assuming the surface heat flux Q(X)=x^ λ at y=0 which vary according to power laws > > I would like to solve them for approximations of λ and n > I know that the above system of equations can be solved by finite difference methods using shooting technique. > I would like to know how to start the solution and would like to know what type of PDE’s are these i.e. parabolic, elliptic, and hyperbolic since MATLAB can solve elliptic nonlinear PDE’s as far as I know and also I am not familiar with solving PDE in MATLAB. > So can any one suggest me the right path. I'm afraid that in Google Groups, your posting comes through as gibberish: http://groups.google.com/group/comp.soft-sys.matlab/browse_thread/thread/b96568c437dadc4d#
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