adjustTimeStep vs localEuler (LTS)

kaaja · February 28, 2018, 08:05

Hi,
does anybody know the difference between using Euler and adjustTimeStep and running localEuler?

clapointe · March 2, 2018, 01:09

localEuler time stepping is used to obtain a steady solution (https://github.com/OpenFOAM/OpenFOAM...lerDdtScheme.H). Euler time stepping is used to obtain a transient solution (https://github.com/OpenFOAM/OpenFOAM...lerDdtScheme.H).

Caelan

kaaja · March 23, 2018, 02:18

Thanks for replying.

In the DTCHull-tutorial, both localEuler and adjustTimeStep is used. What is the different functions of these two in this case?

einstein_zee · March 23, 2018, 04:33

Quote:

Originally Posted by kaaja

Thanks for replying.

In the DTCHull-tutorial, both localEuler and adjustTimeStep is used. What is the different functions of these two in this case?

adjustTimeStep is just a switch to control the time step during runTime based on Courant number. This has nothing to do with your time discretization scheme. And the definition of local Euler is also given in the manual. It's a pseudo-transient scheme to accelerate a solution to steady state using LTS.

February 28, 2018, 08:05	adjustTimeStep vs localEuler (LTS)	#1
kaaja Member Join Date: Apr 2017 Posts: 68 Rep Power: 9	Hi, does anybody know the difference between using Euler and adjustTimeStep and running localEuler?

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March 2, 2018, 01:09		#2
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 15	localEuler time stepping is used to obtain a steady solution (https://github.com/OpenFOAM/OpenFOAM...lerDdtScheme.H). Euler time stepping is used to obtain a transient solution (https://github.com/OpenFOAM/OpenFOAM...lerDdtScheme.H). Caelan

March 23, 2018, 02:18		#3
kaaja Member Join Date: Apr 2017 Posts: 68 Rep Power: 9	Thanks for replying. In the DTCHull-tutorial, both localEuler and adjustTimeStep is used. What is the different functions of these two in this case?