problem in turbulence modelling

toufik08 · May 13, 2014, 11:53

Hi all
please help me, i'm trying to model turbulence by swril axisymetric or axisymetric solver- k-epsilon model, the geometry include chamber in which air is entered, i have used velocity inlet as boundary condition, i don't know where is the problem, fluent says that: "erreur in floating point", i'm new in modelling of turbulence phenomena.
thank you so much.

cfd seeker · May 14, 2014, 02:32

Floating point error comes when some number during the calculations gets divided by Zero. Check the settings in the boundary conditions properly, you must have left some Non-Zero as Zero. Also I will suggest you to go through the fluent manual before modelling your problem if you are new in turbulence modelling.

CFD-fellow · May 14, 2014, 04:51

Hi
In addition of what cfd seeker posted, it may also caused by incorrect boundary condition. For example symmetry boundary with axisymmetry solver or axis boundary with 2D or 3D solver and it occurs on the first iteration.

jafarizade · May 14, 2014, 23:39

hi
i have faced such problem many times
some times it is a temporarily error and by closing the fluent and opening it again the problem will be solved
reagards

toufik08 · May 15, 2014, 14:22

thank you so much, i have found the problem, it was necessary to change axial and radial components from default values (0.0) to (1.0).

May 13, 2014, 11:53	problem in turbulence modelling	#1
toufik08 New Member tawfiq Join Date: Oct 2013 Posts: 11 Rep Power: 12	Hi all please help me, i'm trying to model turbulence by swril axisymetric or axisymetric solver- k-epsilon model, the geometry include chamber in which air is entered, i have used velocity inlet as boundary condition, i don't know where is the problem, fluent says that: "erreur in floating point", i'm new in modelling of turbulence phenomena. thank you so much.

May 15, 2014, 14:22	thanks	#5
toufik08 New Member tawfiq Join Date: Oct 2013 Posts: 11 Rep Power: 12	thank you so much, i have found the problem, it was necessary to change axial and radial components from default values (0.0) to (1.0).

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May 14, 2014, 02:32		#2
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	Floating point error comes when some number during the calculations gets divided by Zero. Check the settings in the boundary conditions properly, you must have left some Non-Zero as Zero. Also I will suggest you to go through the fluent manual before modelling your problem if you are new in turbulence modelling.

May 14, 2014, 04:51		#3
CFD-fellow Senior Member Behrooz Jamshidi Join Date: Apr 2013 Posts: 110 Rep Power: 13	Hi In addition of what cfd seeker posted, it may also caused by incorrect boundary condition. For example symmetry boundary with axisymmetry solver or axis boundary with 2D or 3D solver and it occurs on the first iteration.

May 14, 2014, 23:39		#4
jafarizade New Member Ali Jafarizade Join Date: May 2009 Posts: 22 Rep Power: 16	hi i have faced such problem many times some times it is a temporarily error and by closing the fluent and opening it again the problem will be solved reagards