Re: ??convection coefficent?? a function of concentration

[Daniel Wheeler]

On May 29, 2006, at 12:22 PM, Damm, Edward F. (E. Buddy) wrote:  $u$ and $u_{c}$ are different.  $u$ is the convTerm.  It is confusing that my concentration is in u-fraction (u_c) since carbon is an interstitial. Then the last term is just a source term. It is most definitely not a convection term, since $u_{c}$ does not appear in that particular term. The last term could be represented by,           (u * \phi.getFaceGrad()).getDivergence() assuming $u$ is a vector. My equation is $\frac{\partial u_{c}}{\partial t}=\nabla \left[ D\cdot \nabla u_{c}+u\cdot \nabla \phi \right] $ The last term is a convection term with a coefficient of        $\nabla \phi$ assuming the $u$ is supposed to be a $u_{c}$. Daniel Wheeler