Computing the divergence of a vector -- CFD Online Discussion Forums

Today, 05:18	Computing the divergence of a vector	#1
voidcrow New Member Join Date: Mar 2024 Posts: 9 Rep Power: 2	I'd like to compute the divergence of a vector for use in a source term. Suppose that it takes the form: $\nabla \cdot \vec{j} = \nabla \cdot \left( k \nabla \alpha \right)$ where is some constant and $\alpha$ is a user-defined scalar (so I have access to its gradient via C_UDSI_G). I know it is possible to get the divergence by specifying each component of $\vec{j}$ as its own user-defined scalar, using C_UDSI_G to get the correct components $\partial j_x/\partial x$ , $\partial j_y/\partial y$ , $\partial j_z/\partial z$ and then summing them. Surely there must be a better way to do this than specifying three additional user-defined scalars for this purpose alone?

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