I'm currently a first year grad student in an applied math program. I really love modeling, but everything in my modeling course is flying way over my head. Where can I look for a decent introduction to this subject? We didn't offer the course in my undergrad school, so I'm kind of trying to learn on the fly.
May be, you could search for simulation in chemical engineering and processing. This is the area in which I already spent 53 years as a modeller. Another area is applied thermodynamics (say, equations of state). If you enjoy applied math and programming, take anything in physics or chemistry. Take the equations, develop a program, use this program and ... enjoy. Good luck !
What kind of stuff do you work on? "Modeling" is a very broad definition. You can try a "balls-into-bins" type of problems (http://www14.informatik.tu-muenchen.de/personen/raab/publ/balls.pdf), or analysis of algorithms (like this: http://www.sciencedirect.com/science/article/pii/S0304397501001827), which focuses on runtime.