diffusion Term for add. Variable
Hello,
How can i get ride of the diffusion terms in the transport equation for additional variable. I am trying to transport number density like entity but in the theory there are only Source terms on the right hand side of the equation. Thx Jessica 
I do not understand what you mean.
Do you want to have a transport equation with no diffusion? Just select the transport equation option for the additional variable in this case. 
i am using this transport equation but there exist the diffusion term.
In fact i want to implement an equation like this for the Droplet number Density (dN/dt)+(dUi.N)/(dxi)=Source that means without effect of the turbulent diffusion.. 
So can't you just use a convection only additional variable?

Yes Convective time dependent variable but how?

Add an additional variable, and set it to a transport/convection equation.

that is what that i did but there exist these diffusion terms in the equation of.

What diffusion terms? There are not diffusion terms in the convection additional variables. And even if there are, why not just set the diffusion coefficients to zero?

There are Diffusion Terms in the Transport equation for add. Variabel. And please tell me how to set the Coefficient to zero.

including both laminar and turbulent diffusion... in the theory of the transport equation for the number density of droplet, bubbles and other particles, no diffusion terms and included..

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