Representation of Sources in a 3-D Eulerian-Lagrangian Mass Transport Model

This research introduces an accurate and cost-efficient method for the simulation of outfalls in stratified coastal waters. The representation of sources form a severe limitation for concentration models because they can not resolve concentration fields whose spatial extent is small compared to that of the discretization, whereas sources can easily be simulated in a particle tracking model by simply introducing particles in the domain. In order to avoid the large cost associated with particle tracking models the following approach is used in this research. Sources are simulated by the introduction of particles. Each particle advects and diffuses independently and when the particles have dispersed enough they are mapped onto the numerical grid by identifying the particle density (concentration) associated with each node.