How make F3D to reduce a time step many times down to dtmin?

gennady · December 16, 2009, 10:37

When a number of iterations reaches the maximum limit, F3D reduces time step or declare nonconvergence. I use very small value for the minimum time step limit, however, F3D never reduced time step down to this limit. Moreover, a number of time step reductions can be just one before nonconvergence despite that the time step is still much larger than the limit.
What controls a number of time step reductions? How to make F3D to reduce a time step many times until its value reaches the minimum limit?
Thank you.

ignatz · January 28, 2010, 13:12

Gennady, Have you tried contacting Flow Science, F3D's developer?

December 16, 2009, 10:37	How make F3D to reduce a time step many times down to dtmin?	#1
gennady New Member gennady Markelov Join Date: Dec 2009 Posts: 3 Rep Power: 17	When a number of iterations reaches the maximum limit, F3D reduces time step or declare nonconvergence. I use very small value for the minimum time step limit, however, F3D never reduced time step down to this limit. Moreover, a number of time step reductions can be just one before nonconvergence despite that the time step is still much larger than the limit. What controls a number of time step reductions? How to make F3D to reduce a time step many times until its value reaches the minimum limit? Thank you.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Transient simulation not converging	skabilan	OpenFOAM Running, Solving & CFD	14	December 17, 2019 00:12
Moving mesh	Niklas Wikstrom (Wikstrom)	OpenFOAM Running, Solving & CFD	122	June 15, 2014 07:20
Intermediate step during a time step	Burn	OpenFOAM	0	July 16, 2009 11:01
guidelines on time step	Effendi Ali	FLUENT	3	February 4, 2004 08:50
unsteady calcs in FLUENT	Sanjay Padhiar	Main CFD Forum	1	March 31, 1999 13:32

January 28, 2010, 13:12		#2
ignatz Member Join Date: Jan 2010 Posts: 39 Rep Power: 16	Gennady, Have you tried contacting Flow Science, F3D's developer?