FATAL: floating point exception (AMG divergence)

KeganLeckness · June 8, 2015, 22:03

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, 11:10

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, 22:03	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

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December 2, 2015, 11:10		#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.