NUEN-430 Lecture 6

We cannot take a difference across a cell interface

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: . We cannot take a difference across a cell interface if there is a discontinuity in the diffusion coefficient, because the normal component of the scalar flux gradient will be discontinuous across the interface. Thus we add a scalar flux unknown at the interface, take a difference to the left of the interface, take a difference to the right of the interface, and equate the associated normal components of the currents obtain first the interface scalar flux and then the interface current. ( ) ( (1a) ) (1b) Equating the two, we get ( ) ( ) () Substituting from Eq. (2) into...
View Full Document

Ask a homework question - tutors are online