Eulerian Approach
Posted: October 18th, 2017, 6:30 am
Hi
As we know the HYSPLIT is a Lagrangian Model and calculate Trajectories and concentrations through Lagrangian equations. puff(lagrangian-Gaussian and Lagrangian-top hat) and particle(Lagrangian-trajectory) model are the models which HYSPLIT use. but the question is that in the Draxler and Hess 1997 mentioned that "The model calculation method is a hybrid between Eulerian and Lagrangian approaches, advection, and diffusion(include dispersion and diffusion) calculations are made in Lagrangian framework while concentrations are calculated on a fixed grid(refer to Eulerian model)." I have tried to understand the definition of latter phrase but it has still remained unanswered for me, I conclude that all the equations used in model calculations are based on Lagrangian equations but there is an assimilation with a Eulerian approach to calculate the concentration value in a grid. Am I right? If not can you elaborate on this, please?
As we know the HYSPLIT is a Lagrangian Model and calculate Trajectories and concentrations through Lagrangian equations. puff(lagrangian-Gaussian and Lagrangian-top hat) and particle(Lagrangian-trajectory) model are the models which HYSPLIT use. but the question is that in the Draxler and Hess 1997 mentioned that "The model calculation method is a hybrid between Eulerian and Lagrangian approaches, advection, and diffusion(include dispersion and diffusion) calculations are made in Lagrangian framework while concentrations are calculated on a fixed grid(refer to Eulerian model)." I have tried to understand the definition of latter phrase but it has still remained unanswered for me, I conclude that all the equations used in model calculations are based on Lagrangian equations but there is an assimilation with a Eulerian approach to calculate the concentration value in a grid. Am I right? If not can you elaborate on this, please?