Steady State and dynamic simulation.
General Terms:
In simple words the number of input variables will be more in dynamic Simulation means more data is required to work with dynamics.
Dynamic simulation needs equipment dimensions(Length,Diameter,Weight etc).where as in steady state it is not required.
In dynamics hold ups will come in to picture.where as in steady it is not required.
Eg: The bottom pressure in vessel varies with liquid level in tank.
Dynamics is used for detailed engineering works , OTS works etc. Steady state is for basic engineering studies and will be utilized as a base of detail studies in dynamics.
Steady state is a snapshot of plant where as dynamics is a movie of plant.
Products:
Available software's in market for steady state simulation - PRO/II
Available software's in market for dynamic state simulation - DYNSIM,OMEGA VM.
There are software which have capability to work with both steady state and dynamic state.
There is one more category of simulators available in market is data reconciliation means it corrects the data and utilizes for optimization. can be more useful in yield accounting.
Eg: ROMEO
Modeling:
In dynamic simulator we look for one steady state condition and few parameters which will be obtained from steady state simulator are very useful for dynamic modeling. Eg: overall heat transfer coefficient values of Heat ex-changers.
Mathematically:
Dynamic simulators contains ordinary differential equations in there solvers and it doesn't mean that steady state simulators wont have differential equations but in steady they force them to "0".
