       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

```

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