next up previous

Exercise 22: The computational technique known as "blasting".

In Eq. (29), show that, in the limit as c approaches infinity, the flux terms on the right side of the equation become negligible. Argue that if c is very large in a cell, then the U-value in that cell remains essentially constant from time j to time j+1. This computational technique of setting c to a very large value in a cell to maintain a fixed U-value in that cell is referred to as ``blasting''. Blasting is a very important tool in performance programming, since it can be used to eliminate IF statements.