torabi

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These are replies submitted by torabi

these equations have not any result?

another boundary conidition is added to equations.

sigma(1, z) = 0, sigma(r, 0) = 1, theta(1, z) = 0, theta(r, 0) = 1, u(1, z) = 1, diff(sigma(0, z), r) = 0, diff(sigma(r, 1), z) = 0, diff(theta(0, z), r) = 0, diff(theta(r, 1), z) = 0, diff(u(0, z), r) = 0, diff(u(1, z), r, r) = 0

 

@tomleslie 

I want by applying these conditions gain amount a and b unknown?

diff(f(infinity), y) = 1, diff(g(infinity), y) = 1

as y tends to infinity .

thanks

PADE_3.mw

@tomleslie 

I mean

 res := fsolve({Q-1, QQ-1}, {a, b})

but error ''signum(a)*infinity''

 

Limit is infinite in equation Why parameter y is appear?

Only we have a and b .Because in two equatimin y tends to infinity.

Thanks

@tomleslie 

thanks so much

@Preben Alsholm 

thanks..I want to know about bases of this method that there is in dsolve. certainly, there is good mathematics background for adding extra BCs.

Also, i want to know about value that selected for these extra BC. for example we choose (w(0)=b), amount parameter b how selected?

Thanks

@tomleslie 

thanks...I reform it, but a massage ''"initial Newton iteration is not converging"'' is appear?

please see it.

Thanks so much

3_1_(2).mw

 

@Preben Alsholm 

thanks.. I mean Method that extra boundary condition is added for dsolve differential equations?

thanks

@Preben Alsholm 

yes, I want to calculate p.

But now how you consider extra boundary condition?

is arbitrarily selected of this boundary condition?

thanks

@Preben Alsholm 

thanks..another boundary condition is ((D@@1)(u))(1) = 0.

but i have not another one.

is it possible for solving boundary condition.?

thanks...

 

@epostma 

thanks...

@mehdi jafari 

tanks dear jafari..

yes I want to obtain phi(z) from dsolve this equations.

phi is a funaction of z.

from solving eq3 phi is a function of W(x), and then use in another equations. I think sepration method should be used, but I am not familar with it

thanks

@vv 

thanks...

@vv 

it possible for solving it?

please help me...

thanks

@vv 

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