[amirmohammad]

hi,
I have a question...
how can I converge an equation with just a convection term?
I don't have any diffusion and unsteady and source terms...
does it have any specific discretization?

[laingmj]

Can you describe in more detail what it is that you are trying to do?

[amirmohammad]

Originally Posted by laingmj

Can you describe in more detail what it is that you are trying to do?

I use a finite volume code, in the species equation with the simplification I just have a convection term and it is equal to zero.
In this situation my code is running to diverge.

[FMDenaro]

Originally Posted by amirmohammad

I use a finite volume code, in the species equation with the simplification I just have a convection term and it is equal to zero.
In this situation my code is running to diverge.

Is that something like Div (rho*V) =0 ? that is a constraint, must be satisfied coupling it to the other equations.

[amirmohammad]

Originally Posted by FMDenaro

Is that something like Div (rho*V) =0 ? that is a constraint, must be satisfied coupling it to the other equations.

It is Div (rho*U*C)=0.0

C is the concentration of species.

[FMDenaro]

the key is the same, the convergence of the solution is obtained while solving a system of equations, you can not focus only on this single equation

[amirmohammad]

Originally Posted by FMDenaro

the key is the same, the convergence of the solution is obtained while solving a system of equations, you can not focus only on this single equation

I have 5 equations

1) u momentum
2) v momentum
3) pressure correction
4) oxygen concentration
5) water concentration

in water concentration I just have a convection term as follow:
Div ( rho*U*C) = 0.0