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

September 20, 2024, 06:18	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?

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are On Refbacks are On Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Computing the heat flux vector in OpenFoam	nikovasi	OpenFOAM Programming & Development	1	July 9, 2022 20:22
Divergence Problem Conjugated Heat Transfer	Christoph.Ha	FLUENT	27	December 5, 2017 11:46
Two Phase Flow In Vertical Pipe	stonepreston	FLUENT	2	October 31, 2017 09:35
Problem with Velocity Poisson Equation and Vector Potential Poisson Equation	mykkujinu2201	Main CFD Forum	1	August 12, 2017 14:15
Quarter Burner mesh with periosic condition	SamCanuck	FLUENT	2	August 31, 2011 12:34

All times are GMT -4. The time now is 09:04.