problems with the stability of results

ingeniero_82 · March 14, 2011, 03:22

hi!!! can someone please tell me why a huge unstability in my monitoring points is due???? perhaps is it the value of the timestep???? Thank you very much!!

ghorrocks · March 15, 2011, 07:29

Please attach an image of the instability.

ingeniero_82 · March 16, 2011, 08:25

thank you for your interest ghorrocks. I changed the timestep from 0.1 s (one third of the remaining time of the fluid within the domain as reccommended) to 0.001 s. Doing so, the values of my monitoring points changed from being really chaotic and oscillating to a much more smooth appearance. Again, thank you for your interest. Kind regards from spain

ghorrocks · March 18, 2011, 07:19

Please attach an image of the instability.

Steady state or transient?

March 14, 2011, 03:22	problems with the stability of results	#1
ingeniero_82 New Member Join Date: Mar 2011 Posts: 6 Rep Power: 16	hi!!! can someone please tell me why a huge unstability in my monitoring points is due???? perhaps is it the value of the timestep???? Thank you very much!!

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March 15, 2011, 07:29		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,916 Rep Power: 145	Please attach an image of the instability.

March 16, 2011, 08:25		#3
ingeniero_82 New Member Join Date: Mar 2011 Posts: 6 Rep Power: 16	thank you for your interest ghorrocks. I changed the timestep from 0.1 s (one third of the remaining time of the fluid within the domain as reccommended) to 0.001 s. Doing so, the values of my monitoring points changed from being really chaotic and oscillating to a much more smooth appearance. Again, thank you for your interest. Kind regards from spain

March 18, 2011, 07:19		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,916 Rep Power: 145	Please attach an image of the instability. Steady state or transient?