Add Local Time Stepping (LTS) to Solver

LWhitson2 · November 19, 2013, 11:34

I have been looking through the code for the local time stepping algorithm and it looks like the setrDeltat.h and setInitialrDeltat.h files could be added to any solver to implement local time stepping versus global time stepping. Is this true or am I missing something?

For example, look at rhoPorousMRFPimpleFoam vs rhoPorousMRFLTSPimpleFoam. The only real difference in these two are those two files. The same is true for reactingParcelFoam and LTSReactingParcelFoam as far as I can tell. Thoughts?

Aurelien Thinat · November 21, 2013, 09:34

Hi LWhitson,

I was wondering quite the same thing considering the solver twoPhaseEulerFoam which can take days for some cases. Did you get any answer elsewhere ?

Henning86 · November 28, 2013, 08:19

the implementation of LTS is really that easy.

but the solution are only accurate for steady state solutions.

November 19, 2013, 11:34	Add Local Time Stepping (LTS) to Solver	#1
LWhitson2 New Member L.Bryce Whitson Jr. Join Date: Jun 2011 Posts: 18 Rep Power: 15	I have been looking through the code for the local time stepping algorithm and it looks like the setrDeltat.h and setInitialrDeltat.h files could be added to any solver to implement local time stepping versus global time stepping. Is this true or am I missing something? For example, look at rhoPorousMRFPimpleFoam vs rhoPorousMRFLTSPimpleFoam. The only real difference in these two are those two files. The same is true for reactingParcelFoam and LTSReactingParcelFoam as far as I can tell. Thoughts?

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November 21, 2013, 09:34		#2
Aurelien Thinat Senior Member Aurelien Thinat Join Date: Jul 2010 Posts: 165 Rep Power: 16	Hi LWhitson, I was wondering quite the same thing considering the solver twoPhaseEulerFoam which can take days for some cases. Did you get any answer elsewhere ?

November 28, 2013, 08:19		#3
Henning86 Member Join Date: Nov 2012 Posts: 83 Rep Power: 14	the implementation of LTS is really that easy. but the solution are only accurate for steady state solutions.