ODE solver coefficients

mrangitschdowcom · November 29, 2006, 12:26

Hi all,
I need to change some of the parameters to the ODE solvers (specifically SIBS & KRR4) to try to get a big (stiff) kinetic scheme to work in dieselFoam. The KRR4 gives me an 'exceeded maxtry' error, SIBS gives me a 'step size underflow'. I found that maxtry is set to 40 in the ODE code -- I'd like to set it to a bigger number.
I can't figure out how to overwrite the defaults from my chemistryProperties file. Any suggestions?

Thanks!

Mike

stephan · December 2, 2006, 15:15

Hi,

so why dont you create a new ODe-solver with a different entry for the size? (or change the (original) sources and recompile?)
stephan

zqlhzx · August 18, 2013, 23:16

Hi:
Can you tell me the way of ODEsolver solvers what equation?Is YEqn?

November 29, 2006, 12:26	Hi all, I need to change so	#1
mrangitschdowcom Member Michael Rangitsch Join Date: Mar 2009 Location: Midland, Michigan, USA Posts: 31 Rep Power: 17	Hi all, I need to change some of the parameters to the ODE solvers (specifically SIBS & KRR4) to try to get a big (stiff) kinetic scheme to work in dieselFoam. The KRR4 gives me an 'exceeded maxtry' error, SIBS gives me a 'step size underflow'. I found that maxtry is set to 40 in the ODE code -- I'd like to set it to a bigger number. I can't figure out how to overwrite the defaults from my chemistryProperties file. Any suggestions? Thanks! Mike

December 2, 2006, 15:15	Hi, so why dont you create	#2
stephan Senior Member Stephan Gerber Join Date: Mar 2009 Location: Germany Posts: 118 Rep Power: 17	Hi, so why dont you create a new ODe-solver with a different entry for the size? (or change the (original) sources and recompile?) stephan

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August 18, 2013, 23:16		#3
zqlhzx Member 赵庆良 Join Date: Aug 2013 Posts: 56 Rep Power: 13	Hi: Can you tell me the way of ODEsolver solvers what equation?Is YEqn?