Benjamin Franklin & CFD - Cham

Philadelphia CFD ConferenceInteractions between members of thepopulation at one cell in the 3D gridApril 2010The mass-balance equation for one element of the population contains theusual convection and diffusion terms involving its 3D neighbours, and also:• the „convection-like‟ movementcaused by chemical reaction;• intermingling of remotepopulation members creating„offspring‟ along a diagonal.• At what rate? In proportion tolocal shear, (already used by the„Eddy Break-Up Model‟; see later),with one empirical constant.• The intermingling processinvolved can reasonably be called„engulfment‟.The next slide explains.