Error : floating point exception; overflow.

March 14, 2009, 09:04

Hello

I simulate a conjugate heat transfer model. I have received an error message from running cfx solver. Error: floating point exception; overflow. Do you have any idea about the cause of this problem? Thanks very much

cfx888 · March 16, 2009, 17:44

Check the mesh to avoid zero volume cells.

Pirba · May 18, 2010, 01:15

Hello, I had the same problem running k-epsilon and omega simulations in star-ccm+. When I refined the mesh to 5E6 cells I got the floating point exception error after 17-27 iterations. My initial pressure was set to 0, because I was working with low Re and pressures. When I changed my initial pressure to 8 Pa and my turbulence from length scale to k- epsilon everything went smooth again. I am simulating flow over a packed bed of spheres.
Regards

ghorrocks · May 18, 2010, 07:44

Umm, right. As has been mentioned many times in this forum floating point exception simply means the linear solver has diverged big-time. This cna be caused by many things, either a unphysical setup or inadequate numerical stability being the main ones. You have to do something to increase the numerical stability of the simulation.

March 14, 2009, 09:04	Error : floating point exception; overflow.	#1
maryam Guest Posts: n/a	Hello I simulate a conjugate heat transfer model. I have received an error message from running cfx solver. Error: floating point exception; overflow. Do you have any idea about the cause of this problem? Thanks very much

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March 16, 2009, 17:44		#2
cfx888 New Member james Join Date: Mar 2009 Posts: 1 Rep Power: 0	Check the mesh to avoid zero volume cells.

May 18, 2010, 01:15		#3
Pirba New Member Abrie Join Date: Apr 2010 Location: South Africa, North-West, Potchefstroom Posts: 8 Rep Power: 14	Hello, I had the same problem running k-epsilon and omega simulations in star-ccm+. When I refined the mesh to 5E6 cells I got the floating point exception error after 17-27 iterations. My initial pressure was set to 0, because I was working with low Re and pressures. When I changed my initial pressure to 8 Pa and my turbulence from length scale to k- epsilon everything went smooth again. I am simulating flow over a packed bed of spheres. Regards

May 18, 2010, 07:44		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,327 Rep Power: 138	Umm, right. As has been mentioned many times in this forum floating point exception simply means the linear solver has diverged big-time. This cna be caused by many things, either a unphysical setup or inadequate numerical stability being the main ones. You have to do something to increase the numerical stability of the simulation.