[vidaa]

Hi.
There is an eq. that it has 3 variables: time, radius and pressure.

∂P/∂r+ c/r^2 . ∂r/∂t+ (c^2+2c)/r^3 =0

In each time step, the radius and subsequently the pressure differ.
Please help me for discretization of this eq.

Best regards.

[FMDenaro]

Originally Posted by vidaa

Hi.
There is an eq. that it has 3 variables: time, radius and pressure.

∂P/∂r+ c/r^2 . ∂r/∂t+ (c^2+2c)/r^3 =0

In each time step, the radius and subsequently the pressure differ.
Please help me for discretization of this eq.

Best regards.

Your equation is not clear and need an equation for P (does it depend on t?), too. If r=r(t), you have an ODE once the term ∂P/∂r is fixed.

You should post the source where the equations are written

[vidaa]

Thank you for your reply.
The pressure in outer surface is given and is constant.
At t=0, ∂P/∂r = 0. Thus r(t=0) is certain.
There is no other B.C.
Can I guess and use reciprocative methods?

Thanks alot.