what's the difference between ODE and Eulerimplict？

ajogajog · November 16, 2017, 21:58

In chemistryProperties， we need to define thechemistrySolver

ODE and Eulerimplict can be selected here, but in ode solver, there still have a EulerSI and Euler.

the source code of ODE is in the /src/ODE/ODEsolvers
including Euler EulerSI and some else

the source code of Eulerimplicit is in the /src/thermophysicalmodels/chemistrymodel/chemistrysolver

My question is what's the difference between these two ? and in my experience, the Eulerimplicit is much faster than ODE, why?

thank you !!!

arjun · November 17, 2017, 03:47

ODE solvers are created thinking stiff system in mind.

ajogajog · November 17, 2017, 10:00

Quote:

Originally Posted by arjun

ODE solvers are created thinking stiff system in mind.

what about Eulerimplicit？

arjun · November 18, 2017, 01:41

Quote:

Originally Posted by ajogajog

what about Eulerimplicit？

can't handle stiff system (need extremely small time steps).

November 16, 2017, 21:58	what's the difference between ODE and Eulerimplict？	#1
ajogajog New Member Frank Ann Join Date: Dec 2016 Posts: 6 Rep Power: 9	In chemistryProperties， we need to define thechemistrySolver ODE and Eulerimplict can be selected here, but in ode solver, there still have a EulerSI and Euler. the source code of ODE is in the /src/ODE/ODEsolvers including Euler EulerSI and some else the source code of Eulerimplicit is in the /src/thermophysicalmodels/chemistrymodel/chemistrysolver My question is what's the difference between these two ? and in my experience, the Eulerimplicit is much faster than ODE, why? thank you !!!

November 17, 2017, 03:47		#2
arjun Senior Member Arjun Join Date: Mar 2009 Location: Nurenberg, Germany Posts: 1,275 Rep Power: 34	ODE solvers are created thinking stiff system in mind.