FATAL: floating point exception (AMG divergence)

KeganLeckness · June 8, 2015, 23:03

Hi, all.

I'm running a two-way FSI transient analysis. I have pressure at an inlet defined by a UDF. When the magnitude is 70 kPa, the simulation runs swimmingly; but when I use 100 kPa, Workbench yells about a floating point exception and says 'a solver failure occured during the run in the Structural system'. The structural system, however, points to Fluent which reports
"
Divergence detected in AMG solver: temperature
...
Error at Node 0: floating point exception"

Is there any way to work around this? Why does increasing the pressure value only result in some temperature error?

Any advice would be appreciated,
Kegan

KeganLeckness · December 2, 2015, 12:10

Before this warning, an increasing number of cells were reported as reaching a temperature limit. I was able to view what cells were problematic by using an IsoSurface in CFD-Post. Changing the fluid domain geometry and initializing a dynamic remeshing scheme solved this problem.

June 8, 2015, 23:03	FATAL: floating point exception (AMG divergence)	#1
KeganLeckness Member Kegan Leckness Join Date: Mar 2015 Posts: 38 Rep Power: 11	Hi, all. I'm running a two-way FSI transient analysis. I have pressure at an inlet defined by a UDF. When the magnitude is 70 kPa, the simulation runs swimmingly; but when I use 100 kPa, Workbench yells about a floating point exception and says 'a solver failure occured during the run in the Structural system'. The structural system, however, points to Fluent which reports " Divergence detected in AMG solver: temperature ... Error at Node 0: floating point exception" Is there any way to work around this? Why does increasing the pressure value only result in some temperature error? Any advice would be appreciated, Kegan

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
buoyantBoussinesqSimpleFoam: Floating point exception (core dumped)	raghav.venky	OpenFOAM Running, Solving & CFD	11	June 30, 2019 14:33
MPI Error - simpleFoam - Floating Point Exception	scott	OpenFOAM Running, Solving & CFD	3	April 13, 2012 17:34
Quarter Burner mesh with periosic condition	SamCanuck	FLUENT	2	August 31, 2011 12:34
Finished simulation doesn't start: floating point exception [Divide by zero]	MaxCFD	STAR-CCM+	3	June 26, 2011 11:31
Primitive error at node- Floating point exception / continuity divergence issues	phales15	FLUENT	0	April 30, 2011 20:05

December 2, 2015, 12:10		#2
KeganLeckness Member Kegan Leckness Join Date: Mar 2015 Posts: 38 Rep Power: 11	Before this warning, an increasing number of cells were reported as reaching a temperature limit. I was able to view what cells were problematic by using an IsoSurface in CFD-Post. Changing the fluid domain geometry and initializing a dynamic remeshing scheme solved this problem.