I am new to the topic of co-simulation. I am familiar with the definitions (based on Trcka "COMPARISON OF CO-SIMULATIONAPPROACHES FOR BUILDING ANDHVAC/R SYSTEM SIMULATION "):
- Quasi-dynamic coupling, also called loose coupling, orping-pongcoupling, where distributed models run in sequence, and one model uses the known output values, based on the values at the previous time steps, of the coupled model.
- Fully-dynamic coupling, also called strong coupling, oronion coupling, where distributed models iterate withineach time step until the error estimate falls within a predefined tolerance.
My question: Is FMI/co-simulation a loose coupling method? What is FMI/model-exchange? From my understanding, it is not a strong coupling method. Am I understanding it correct that in model-exchange, the tool that imports the FMU is collecting all ODE and algebraic equations and the tool solve the entire system with a single solver. So it is more a standard to describe models in a unified way so that they can be integrated in different simulation environments?
Thank you very much for your help