uds problem in solid zone

alireza2475 · October 17, 2012, 11:10

hi guys,

I'm trying to use UDS to model the fire product (CO2, CO, Soot,...) propagation in a duct-like geometry which has some complex curvature in its section.
The problem arises when I model the thickness of the walls (solid zone) to consider the conduction heat transfer in them. either by adding a solid zone having the correct thickness outside the walls in gambit or enabling shell conduction zone in the Fluent, I encounter the same problem. The UDS equation in single core solution leads to invalid number residual and in multi-core on single CPU it shows an error box showing "floating point error: invalid number". By the Way, not considering the solid zones, the problem disappears.

The scalars are solved in fluid zones only and the flux function is based on "mass flow rate". the scalars have a source term in an internal fluid zone.

Does any body have any idea regarding solving the problem. thank you very much guys.

alireza2475 · October 19, 2013, 12:02

Is there any comment on the above issue? I'm still confused with the problem!

A CFD free user · October 19, 2013, 16:13

Hi!
Maybe you forgot to set the scalar for solid zone as well. Go to define/user defined scalar/ and from solution zone drop down list, select appropriate solid zones for the interested scalar too.

October 17, 2012, 11:10	uds problem in solid zone	#1
alireza2475 New Member alireza Join Date: Jul 2010 Posts: 12 Rep Power: 15	hi guys, I'm trying to use UDS to model the fire product (CO2, CO, Soot,...) propagation in a duct-like geometry which has some complex curvature in its section. The problem arises when I model the thickness of the walls (solid zone) to consider the conduction heat transfer in them. either by adding a solid zone having the correct thickness outside the walls in gambit or enabling shell conduction zone in the Fluent, I encounter the same problem. The UDS equation in single core solution leads to invalid number residual and in multi-core on single CPU it shows an error box showing "floating point error: invalid number". By the Way, not considering the solid zones, the problem disappears. The scalars are solved in fluid zones only and the flux function is based on "mass flow rate". the scalars have a source term in an internal fluid zone. Does any body have any idea regarding solving the problem. thank you very much guys.

October 19, 2013, 16:13		#3
A CFD free user Senior Member A-A Azarafza Join Date: Jan 2013 Posts: 226 Rep Power: 14	Hi! Maybe you forgot to set the scalar for solid zone as well. Go to define/user defined scalar/ and from solution zone drop down list, select appropriate solid zones for the interested scalar too. __________________ Regard yours

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October 19, 2013, 12:02		#2
alireza2475 New Member alireza Join Date: Jul 2010 Posts: 12 Rep Power: 15	Is there any comment on the above issue? I'm still confused with the problem!