Floating Point Error

May 18, 2007, 06:50

Hi there,

I'm running a ~950000 cell combustion calc, and after a little while of the residuals converging nicely(as with 650k model), SUDDENLY the residuals shoot up and the turbulent viscosity ratio starts being limited in more and more cells. Eventually I get a message saying floating point error and the simulation stops running. Has anyone experienced this before?

Any help would be very much appreciated.

Thanks Phil

May 21, 2007, 16:01

Have you try to coarsen your grid? Sometimes in my simulation a fine grid might cause error message like this

May 22, 2007, 15:38

I's sure you wouldn't have missed reducing under-relaxation factors.

May 18, 2007, 06:50	Floating Point Error	#1
Phil Guest Posts: n/a	Hi there, I'm running a ~950000 cell combustion calc, and after a little while of the residuals converging nicely(as with 650k model), SUDDENLY the residuals shoot up and the turbulent viscosity ratio starts being limited in more and more cells. Eventually I get a message saying floating point error and the simulation stops running. Has anyone experienced this before? Any help would be very much appreciated. Thanks Phil

May 21, 2007, 16:01	Re: Floating Point Error	#2
KW Guest Posts: n/a	Have you try to coarsen your grid? Sometimes in my simulation a fine grid might cause error message like this

May 22, 2007, 15:38	Re: Floating Point Error	#3
Prasad Dudhgaonkar Guest Posts: n/a	I's sure you wouldn't have missed reducing under-relaxation factors.

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