Re: NDSolve Unable to find initial conditions that satisfy the

*To*: mathgroup at smc.vnet.net*Subject*: [mg116580] Re: NDSolve Unable to find initial conditions that satisfy the*From*: "Ali K. Ozdagli" <ozdagli at gmail.com>*Date*: Sun, 20 Feb 2011 05:27:27 -0500 (EST)*References*: <AANLkTi=wu=TT=tCs+P=3-VnMUjmbffqMYqQBqpLtfQx_@mail.gmail.com>

Any help? On Fri, Feb 11, 2011 at 8:25 PM, Ali K. Ozdagli <ozdagli at gmail.com> wrote: > Hello all, > > When I write the following to mathematica > > NDSolve[{0.04*u[z, t] == -3*(D[u[z, t], z])^(1/3) + 0.02*z*D[u[z, t], z] - > D[u[z, t], t], Derivative[1, 0][u][1, t] == 0, u[z, 0] == 0}, u, {z, 1, 2}, > {t, 0, 1}, MaxSteps -> 10^4, AccuracyGoal -> 8, SolveDelayed -> True]; > > Although the solution is relatively easy, u[z,t]=0, it gives the following > errors: > > NDSolve::ibcinc: Warning: Boundary and initial conditions are inconsistent. > >> > > NDSolve::icfail: Unable to find initial conditions that satisfy the > residual function within specified tolerances. Try giving initial conditions > for both values and derivatives of the functions >> > > > I do not see any inconsistency in the boundary conditions and don't know > why mathematica cannot find a solution. > > Any help is appreciated. > > Best, > > Ali > > -- Ali K. Ozdagli